Abstract

We examine optically induced birefringence in semicrystalline azopolymer films that are held at glass-transition temperature Tg. The birefringence increases markedly after interception of the pump beam; the saturation value depends on exposure time. In addition, the induced birefringence is completely erased by irradiation with a circularly polarized beam at Tg. Using this thermally assisted method, we demonstrate the holographic recording of a test image. The intensity of the diffracted beam also increases after interception of the writing beams. Furthermore, the retrieved image is found to have a resolution of ∼30 lp/mm. This resolution is comparable with that of the optical setup that is used. Accordingly, the thermally assisted recording by use of semicrystalline azopolymers is a promising method for reversible holographic storage.

© 2002 Optical Society of America

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  1. M. Eich, J. H. Wendorff, B. Reck, H. Ringsdorf, “Reversible digital and holographic optical storage in polymeric liquid crystals,” Makromol. Chem. Rapid Commun. 8, 59–63 (1987).
    [CrossRef]
  2. M. Eich, J. H. Wendorff, “Laser-induced gratings and spectroscopy in monodomains of liquid-crystalline polymers,” J. Opt. Soc. Am. B 7, 1428–1436 (1990).
    [CrossRef]
  3. S. Hvilsted, F. Andruzzi, P. S. Ramanujam, “Side-chain liquid-crystalline polyesters for optical information storage,” Opt. Lett. 17, 1234–1236 (1992).
    [CrossRef] [PubMed]
  4. S. J. Zilker, T. Bieringer, D. Haarer, R. S. Stein, J. W. van Egmond, S. G. Kostromine, “Holographic data storage in amorphous polymers,” Adv. Mater. 10, 855–859 (1998).
    [CrossRef]
  5. S. J. Zilker, M. R. Huber, T. Bieringer, D. Haarer, “Holographic recording in amorphous side-chain polymers: a comparison of two different design philosophies,” Appl. Phys. B 68, 893–897 (1999).
    [CrossRef]
  6. K. Kawano, T. Ishii, J. Minabe, T. Niitsu, Y. Nishikata, K. Baba, “Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain,” Opt. Lett. 24, 1269–1271 (1999).
    [CrossRef]
  7. P. Rochon, J. Gosselin, A. Natansohn, S. Xie, “Optically induced and erased birefringence and dichroism in azoaromatic polymers,” Appl. Phys. Lett. 60, 4–5 (1992).
    [CrossRef]
  8. T. Todorov, L. Nikolova, N. Tomova, “Polarization holography. 1. A new high-efficiency organic material with reversible photoinduced birefringence,” Appl. Opt. 23, 4309–4312 (1984).
    [CrossRef] [PubMed]
  9. L. Läsker, J. Stumpe, T. Fischer, M. Rutloh, S. Kostromin, R. Ruhmann, “Influence of supramolecular order on the light-induced reorientation process in photochromic side group polymers,” Mol. Cryst. Liq. Cryst. 261, 371–381 (1995).
    [CrossRef]
  10. J. Stumpe, T. Fischer, M. Rutloh, R. Rosenhauer, J. G. Meier, “Photoinduced alignment of LC polymers by the combination of photoorientation and thermotropic self-organization,” in Liquid Crystals III, I.-C. Khoo, ed., Proc. SPIE3800, 150–163 (1999).
    [CrossRef]
  11. M. Kidowaki, T. Fujiwara, S. Morino, K. Ichimura, J. Stumpe, “Thermal amplification of photoinduced optical anisotropy of p-cyanoazobenzene polymer films monitored by temperature scanning ellipsometry,” Appl. Phys. Lett. 76, 1377–1379 (2000).
    [CrossRef]
  12. M. Sato, M. Hayakawa, K. Nakagawa, K. Mukaida, H. Fujiwara, “Synthesis and properties of polyesters having cyanoazobenzene units in the side chain,” Macromol. Rapid Commun. 15, 21–29 (1994).
    [CrossRef]
  13. K. Nakagawa, R. Komatsu, H. Fujiwara, M. Sato, “Holographic recording in polyesters having cyanoazobenzene units in the side chain,” in 17th Congress of the International Commission for Optics: Optics for Science and New Technology, J. Chang, J. Lee, C. Nam, eds., Proc. SPIE2778, 571–572 (1996).
  14. F. Langugné Labarthet, P. Rochon, A. Natansohn, “Polarization analysis of diffracted orders from a birefringence grating recorded on azobenzene containing polymer,” Appl. Phys. Lett. 75, 1377–1379 (1999).
    [CrossRef]
  15. P. Rochon, E. Batalla, N. Natansohn, “Optically induced surface gratings on azoaromatic polymer films,” Appl. Phys. Lett. 66, 136–138 (1995).
    [CrossRef]
  16. D. Y. Kim, S. K. Tripathy, L. Li, J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995).
    [CrossRef]
  17. J. Minabe, K. Kawano, Y. Nishikata, T. Ishii, T. Niitsu, K. Baba, “Dark enhancement of optically induced birefringence in azobenzene-containing polyester films,” in Nonlinear Optics: Materials, Fundamentals and Applications, Vol. 46 of OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2000), pp. 74–76.
  18. P. S. Ramanujam, S. Hvilsted, F. Andruzzi, “Novel biphotonic holographic storage in a side-chain liquid crystalline polyester,” Appl. Phys. Lett. 62, 1041–1043 (1993).
    [CrossRef]
  19. H. Bach, K. Anderle, Th. Fuhrmann, J. H. Wendorff, “Biphoton-induced refractive index change in 4-amino-4′-nitroazobenzene/polycarbonate,” J. Phys. Chem. 100, 4135–4140 (1996).
    [CrossRef]
  20. P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
    [CrossRef]
  21. T. Todorov, L. Nikolova, N. Tomova, “Polarization holography. 2. Polarization holographic gratings in photoanisotropic materials with and without intrinsic birefringence,” Appl. Opt. 23, 4588–4591 (1984).
    [CrossRef]
  22. K. Kawano, J. Minabe, T. Niitsu, T. Ishii, Y. Nishikata, K. Baba, “Optical computing a vector holographic memory system,” Opt. Lett. 25, 1077–1079 (2000).
    [CrossRef]
  23. C. Sánchez, R. Alcalá, S. Hvilsted, P. S. Ramanujam, “Biphotonic holographic gratings in azobenzene polyesters: surface relief phenomena and polarization effects,” Appl. Phys. Lett. 77, 1440–1442 (2000).
    [CrossRef]
  24. C. Kulinna, I. Zebger, S. Hvilsted, P. S. Ramanujam, H. W. Siesler, “Characterization of the segmental mobility of liquid-crystalline side-chain polyesters by Fourier-transform infrared spectroscopy,” Macromol. Symp. 83, 169–181 (1994).
    [CrossRef]
  25. P. S. Ramanujam, S. Hvilsted, I. Zebger, H. W. Siesler, “On the explanation of the biphotonic processes in polyesters containing azobenzene moieties in the side chain,” Macromol. Rapid Commun. 16, 455–461 (1995).
    [CrossRef]
  26. O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, L.-S. Park, “Photoinduced phase transition of nematic liquid crystals with donor–acceptor azobenzenes: mechanism of the thermal recovery of the nematic phase,” Phys. Chem. Chem. Phys. 1, 4219–4224 (1999).
    [CrossRef]

2000

M. Kidowaki, T. Fujiwara, S. Morino, K. Ichimura, J. Stumpe, “Thermal amplification of photoinduced optical anisotropy of p-cyanoazobenzene polymer films monitored by temperature scanning ellipsometry,” Appl. Phys. Lett. 76, 1377–1379 (2000).
[CrossRef]

K. Kawano, J. Minabe, T. Niitsu, T. Ishii, Y. Nishikata, K. Baba, “Optical computing a vector holographic memory system,” Opt. Lett. 25, 1077–1079 (2000).
[CrossRef]

C. Sánchez, R. Alcalá, S. Hvilsted, P. S. Ramanujam, “Biphotonic holographic gratings in azobenzene polyesters: surface relief phenomena and polarization effects,” Appl. Phys. Lett. 77, 1440–1442 (2000).
[CrossRef]

1999

O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, L.-S. Park, “Photoinduced phase transition of nematic liquid crystals with donor–acceptor azobenzenes: mechanism of the thermal recovery of the nematic phase,” Phys. Chem. Chem. Phys. 1, 4219–4224 (1999).
[CrossRef]

F. Langugné Labarthet, P. Rochon, A. Natansohn, “Polarization analysis of diffracted orders from a birefringence grating recorded on azobenzene containing polymer,” Appl. Phys. Lett. 75, 1377–1379 (1999).
[CrossRef]

S. J. Zilker, M. R. Huber, T. Bieringer, D. Haarer, “Holographic recording in amorphous side-chain polymers: a comparison of two different design philosophies,” Appl. Phys. B 68, 893–897 (1999).
[CrossRef]

K. Kawano, T. Ishii, J. Minabe, T. Niitsu, Y. Nishikata, K. Baba, “Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain,” Opt. Lett. 24, 1269–1271 (1999).
[CrossRef]

1998

S. J. Zilker, T. Bieringer, D. Haarer, R. S. Stein, J. W. van Egmond, S. G. Kostromine, “Holographic data storage in amorphous polymers,” Adv. Mater. 10, 855–859 (1998).
[CrossRef]

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

1996

H. Bach, K. Anderle, Th. Fuhrmann, J. H. Wendorff, “Biphoton-induced refractive index change in 4-amino-4′-nitroazobenzene/polycarbonate,” J. Phys. Chem. 100, 4135–4140 (1996).
[CrossRef]

1995

L. Läsker, J. Stumpe, T. Fischer, M. Rutloh, S. Kostromin, R. Ruhmann, “Influence of supramolecular order on the light-induced reorientation process in photochromic side group polymers,” Mol. Cryst. Liq. Cryst. 261, 371–381 (1995).
[CrossRef]

P. Rochon, E. Batalla, N. Natansohn, “Optically induced surface gratings on azoaromatic polymer films,” Appl. Phys. Lett. 66, 136–138 (1995).
[CrossRef]

D. Y. Kim, S. K. Tripathy, L. Li, J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995).
[CrossRef]

P. S. Ramanujam, S. Hvilsted, I. Zebger, H. W. Siesler, “On the explanation of the biphotonic processes in polyesters containing azobenzene moieties in the side chain,” Macromol. Rapid Commun. 16, 455–461 (1995).
[CrossRef]

1994

C. Kulinna, I. Zebger, S. Hvilsted, P. S. Ramanujam, H. W. Siesler, “Characterization of the segmental mobility of liquid-crystalline side-chain polyesters by Fourier-transform infrared spectroscopy,” Macromol. Symp. 83, 169–181 (1994).
[CrossRef]

M. Sato, M. Hayakawa, K. Nakagawa, K. Mukaida, H. Fujiwara, “Synthesis and properties of polyesters having cyanoazobenzene units in the side chain,” Macromol. Rapid Commun. 15, 21–29 (1994).
[CrossRef]

1993

P. S. Ramanujam, S. Hvilsted, F. Andruzzi, “Novel biphotonic holographic storage in a side-chain liquid crystalline polyester,” Appl. Phys. Lett. 62, 1041–1043 (1993).
[CrossRef]

1992

S. Hvilsted, F. Andruzzi, P. S. Ramanujam, “Side-chain liquid-crystalline polyesters for optical information storage,” Opt. Lett. 17, 1234–1236 (1992).
[CrossRef] [PubMed]

P. Rochon, J. Gosselin, A. Natansohn, S. Xie, “Optically induced and erased birefringence and dichroism in azoaromatic polymers,” Appl. Phys. Lett. 60, 4–5 (1992).
[CrossRef]

1990

1987

M. Eich, J. H. Wendorff, B. Reck, H. Ringsdorf, “Reversible digital and holographic optical storage in polymeric liquid crystals,” Makromol. Chem. Rapid Commun. 8, 59–63 (1987).
[CrossRef]

1984

Alcalá, R.

C. Sánchez, R. Alcalá, S. Hvilsted, P. S. Ramanujam, “Biphotonic holographic gratings in azobenzene polyesters: surface relief phenomena and polarization effects,” Appl. Phys. Lett. 77, 1440–1442 (2000).
[CrossRef]

Anderle, K.

H. Bach, K. Anderle, Th. Fuhrmann, J. H. Wendorff, “Biphoton-induced refractive index change in 4-amino-4′-nitroazobenzene/polycarbonate,” J. Phys. Chem. 100, 4135–4140 (1996).
[CrossRef]

Andruzzi, F.

P. S. Ramanujam, S. Hvilsted, F. Andruzzi, “Novel biphotonic holographic storage in a side-chain liquid crystalline polyester,” Appl. Phys. Lett. 62, 1041–1043 (1993).
[CrossRef]

S. Hvilsted, F. Andruzzi, P. S. Ramanujam, “Side-chain liquid-crystalline polyesters for optical information storage,” Opt. Lett. 17, 1234–1236 (1992).
[CrossRef] [PubMed]

Baba, K.

K. Kawano, J. Minabe, T. Niitsu, T. Ishii, Y. Nishikata, K. Baba, “Optical computing a vector holographic memory system,” Opt. Lett. 25, 1077–1079 (2000).
[CrossRef]

K. Kawano, T. Ishii, J. Minabe, T. Niitsu, Y. Nishikata, K. Baba, “Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain,” Opt. Lett. 24, 1269–1271 (1999).
[CrossRef]

J. Minabe, K. Kawano, Y. Nishikata, T. Ishii, T. Niitsu, K. Baba, “Dark enhancement of optically induced birefringence in azobenzene-containing polyester films,” in Nonlinear Optics: Materials, Fundamentals and Applications, Vol. 46 of OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2000), pp. 74–76.

Bach, H.

H. Bach, K. Anderle, Th. Fuhrmann, J. H. Wendorff, “Biphoton-induced refractive index change in 4-amino-4′-nitroazobenzene/polycarbonate,” J. Phys. Chem. 100, 4135–4140 (1996).
[CrossRef]

Batalla, E.

P. Rochon, E. Batalla, N. Natansohn, “Optically induced surface gratings on azoaromatic polymer films,” Appl. Phys. Lett. 66, 136–138 (1995).
[CrossRef]

Bieringer, T.

S. J. Zilker, M. R. Huber, T. Bieringer, D. Haarer, “Holographic recording in amorphous side-chain polymers: a comparison of two different design philosophies,” Appl. Phys. B 68, 893–897 (1999).
[CrossRef]

S. J. Zilker, T. Bieringer, D. Haarer, R. S. Stein, J. W. van Egmond, S. G. Kostromine, “Holographic data storage in amorphous polymers,” Adv. Mater. 10, 855–859 (1998).
[CrossRef]

Chen, W.

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

Eich, M.

M. Eich, J. H. Wendorff, “Laser-induced gratings and spectroscopy in monodomains of liquid-crystalline polymers,” J. Opt. Soc. Am. B 7, 1428–1436 (1990).
[CrossRef]

M. Eich, J. H. Wendorff, B. Reck, H. Ringsdorf, “Reversible digital and holographic optical storage in polymeric liquid crystals,” Makromol. Chem. Rapid Commun. 8, 59–63 (1987).
[CrossRef]

Fischer, T.

L. Läsker, J. Stumpe, T. Fischer, M. Rutloh, S. Kostromin, R. Ruhmann, “Influence of supramolecular order on the light-induced reorientation process in photochromic side group polymers,” Mol. Cryst. Liq. Cryst. 261, 371–381 (1995).
[CrossRef]

J. Stumpe, T. Fischer, M. Rutloh, R. Rosenhauer, J. G. Meier, “Photoinduced alignment of LC polymers by the combination of photoorientation and thermotropic self-organization,” in Liquid Crystals III, I.-C. Khoo, ed., Proc. SPIE3800, 150–163 (1999).
[CrossRef]

Fuhrmann, Th.

H. Bach, K. Anderle, Th. Fuhrmann, J. H. Wendorff, “Biphoton-induced refractive index change in 4-amino-4′-nitroazobenzene/polycarbonate,” J. Phys. Chem. 100, 4135–4140 (1996).
[CrossRef]

Fujiwara, H.

M. Sato, M. Hayakawa, K. Nakagawa, K. Mukaida, H. Fujiwara, “Synthesis and properties of polyesters having cyanoazobenzene units in the side chain,” Macromol. Rapid Commun. 15, 21–29 (1994).
[CrossRef]

K. Nakagawa, R. Komatsu, H. Fujiwara, M. Sato, “Holographic recording in polyesters having cyanoazobenzene units in the side chain,” in 17th Congress of the International Commission for Optics: Optics for Science and New Technology, J. Chang, J. Lee, C. Nam, eds., Proc. SPIE2778, 571–572 (1996).

Fujiwara, T.

M. Kidowaki, T. Fujiwara, S. Morino, K. Ichimura, J. Stumpe, “Thermal amplification of photoinduced optical anisotropy of p-cyanoazobenzene polymer films monitored by temperature scanning ellipsometry,” Appl. Phys. Lett. 76, 1377–1379 (2000).
[CrossRef]

Gong, X.

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

Gosselin, J.

P. Rochon, J. Gosselin, A. Natansohn, S. Xie, “Optically induced and erased birefringence and dichroism in azoaromatic polymers,” Appl. Phys. Lett. 60, 4–5 (1992).
[CrossRef]

Haarer, D.

S. J. Zilker, M. R. Huber, T. Bieringer, D. Haarer, “Holographic recording in amorphous side-chain polymers: a comparison of two different design philosophies,” Appl. Phys. B 68, 893–897 (1999).
[CrossRef]

S. J. Zilker, T. Bieringer, D. Haarer, R. S. Stein, J. W. van Egmond, S. G. Kostromine, “Holographic data storage in amorphous polymers,” Adv. Mater. 10, 855–859 (1998).
[CrossRef]

Hayakawa, M.

M. Sato, M. Hayakawa, K. Nakagawa, K. Mukaida, H. Fujiwara, “Synthesis and properties of polyesters having cyanoazobenzene units in the side chain,” Macromol. Rapid Commun. 15, 21–29 (1994).
[CrossRef]

Hvilsted, S.

C. Sánchez, R. Alcalá, S. Hvilsted, P. S. Ramanujam, “Biphotonic holographic gratings in azobenzene polyesters: surface relief phenomena and polarization effects,” Appl. Phys. Lett. 77, 1440–1442 (2000).
[CrossRef]

P. S. Ramanujam, S. Hvilsted, I. Zebger, H. W. Siesler, “On the explanation of the biphotonic processes in polyesters containing azobenzene moieties in the side chain,” Macromol. Rapid Commun. 16, 455–461 (1995).
[CrossRef]

C. Kulinna, I. Zebger, S. Hvilsted, P. S. Ramanujam, H. W. Siesler, “Characterization of the segmental mobility of liquid-crystalline side-chain polyesters by Fourier-transform infrared spectroscopy,” Macromol. Symp. 83, 169–181 (1994).
[CrossRef]

P. S. Ramanujam, S. Hvilsted, F. Andruzzi, “Novel biphotonic holographic storage in a side-chain liquid crystalline polyester,” Appl. Phys. Lett. 62, 1041–1043 (1993).
[CrossRef]

S. Hvilsted, F. Andruzzi, P. S. Ramanujam, “Side-chain liquid-crystalline polyesters for optical information storage,” Opt. Lett. 17, 1234–1236 (1992).
[CrossRef] [PubMed]

Ichimura, K.

M. Kidowaki, T. Fujiwara, S. Morino, K. Ichimura, J. Stumpe, “Thermal amplification of photoinduced optical anisotropy of p-cyanoazobenzene polymer films monitored by temperature scanning ellipsometry,” Appl. Phys. Lett. 76, 1377–1379 (2000).
[CrossRef]

Ikeda, T.

O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, L.-S. Park, “Photoinduced phase transition of nematic liquid crystals with donor–acceptor azobenzenes: mechanism of the thermal recovery of the nematic phase,” Phys. Chem. Chem. Phys. 1, 4219–4224 (1999).
[CrossRef]

Ishii, T.

K. Kawano, J. Minabe, T. Niitsu, T. Ishii, Y. Nishikata, K. Baba, “Optical computing a vector holographic memory system,” Opt. Lett. 25, 1077–1079 (2000).
[CrossRef]

K. Kawano, T. Ishii, J. Minabe, T. Niitsu, Y. Nishikata, K. Baba, “Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain,” Opt. Lett. 24, 1269–1271 (1999).
[CrossRef]

J. Minabe, K. Kawano, Y. Nishikata, T. Ishii, T. Niitsu, K. Baba, “Dark enhancement of optically induced birefringence in azobenzene-containing polyester films,” in Nonlinear Optics: Materials, Fundamentals and Applications, Vol. 46 of OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2000), pp. 74–76.

Kanazawa, A.

O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, L.-S. Park, “Photoinduced phase transition of nematic liquid crystals with donor–acceptor azobenzenes: mechanism of the thermal recovery of the nematic phase,” Phys. Chem. Chem. Phys. 1, 4219–4224 (1999).
[CrossRef]

Kawano, K.

K. Kawano, J. Minabe, T. Niitsu, T. Ishii, Y. Nishikata, K. Baba, “Optical computing a vector holographic memory system,” Opt. Lett. 25, 1077–1079 (2000).
[CrossRef]

K. Kawano, T. Ishii, J. Minabe, T. Niitsu, Y. Nishikata, K. Baba, “Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain,” Opt. Lett. 24, 1269–1271 (1999).
[CrossRef]

J. Minabe, K. Kawano, Y. Nishikata, T. Ishii, T. Niitsu, K. Baba, “Dark enhancement of optically induced birefringence in azobenzene-containing polyester films,” in Nonlinear Optics: Materials, Fundamentals and Applications, Vol. 46 of OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2000), pp. 74–76.

Kidowaki, M.

M. Kidowaki, T. Fujiwara, S. Morino, K. Ichimura, J. Stumpe, “Thermal amplification of photoinduced optical anisotropy of p-cyanoazobenzene polymer films monitored by temperature scanning ellipsometry,” Appl. Phys. Lett. 76, 1377–1379 (2000).
[CrossRef]

Kim, D. Y.

D. Y. Kim, S. K. Tripathy, L. Li, J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995).
[CrossRef]

Komatsu, R.

K. Nakagawa, R. Komatsu, H. Fujiwara, M. Sato, “Holographic recording in polyesters having cyanoazobenzene units in the side chain,” in 17th Congress of the International Commission for Optics: Optics for Science and New Technology, J. Chang, J. Lee, C. Nam, eds., Proc. SPIE2778, 571–572 (1996).

Kostromin, S.

L. Läsker, J. Stumpe, T. Fischer, M. Rutloh, S. Kostromin, R. Ruhmann, “Influence of supramolecular order on the light-induced reorientation process in photochromic side group polymers,” Mol. Cryst. Liq. Cryst. 261, 371–381 (1995).
[CrossRef]

Kostromine, S. G.

S. J. Zilker, T. Bieringer, D. Haarer, R. S. Stein, J. W. van Egmond, S. G. Kostromine, “Holographic data storage in amorphous polymers,” Adv. Mater. 10, 855–859 (1998).
[CrossRef]

Kulinna, C.

C. Kulinna, I. Zebger, S. Hvilsted, P. S. Ramanujam, H. W. Siesler, “Characterization of the segmental mobility of liquid-crystalline side-chain polyesters by Fourier-transform infrared spectroscopy,” Macromol. Symp. 83, 169–181 (1994).
[CrossRef]

Kumar, J.

D. Y. Kim, S. K. Tripathy, L. Li, J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995).
[CrossRef]

Langugné Labarthet, F.

F. Langugné Labarthet, P. Rochon, A. Natansohn, “Polarization analysis of diffracted orders from a birefringence grating recorded on azobenzene containing polymer,” Appl. Phys. Lett. 75, 1377–1379 (1999).
[CrossRef]

Läsker, L.

L. Läsker, J. Stumpe, T. Fischer, M. Rutloh, S. Kostromin, R. Ruhmann, “Influence of supramolecular order on the light-induced reorientation process in photochromic side group polymers,” Mol. Cryst. Liq. Cryst. 261, 371–381 (1995).
[CrossRef]

Li, L.

D. Y. Kim, S. K. Tripathy, L. Li, J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995).
[CrossRef]

Meier, J. G.

J. Stumpe, T. Fischer, M. Rutloh, R. Rosenhauer, J. G. Meier, “Photoinduced alignment of LC polymers by the combination of photoorientation and thermotropic self-organization,” in Liquid Crystals III, I.-C. Khoo, ed., Proc. SPIE3800, 150–163 (1999).
[CrossRef]

Minabe, J.

K. Kawano, J. Minabe, T. Niitsu, T. Ishii, Y. Nishikata, K. Baba, “Optical computing a vector holographic memory system,” Opt. Lett. 25, 1077–1079 (2000).
[CrossRef]

K. Kawano, T. Ishii, J. Minabe, T. Niitsu, Y. Nishikata, K. Baba, “Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain,” Opt. Lett. 24, 1269–1271 (1999).
[CrossRef]

J. Minabe, K. Kawano, Y. Nishikata, T. Ishii, T. Niitsu, K. Baba, “Dark enhancement of optically induced birefringence in azobenzene-containing polyester films,” in Nonlinear Optics: Materials, Fundamentals and Applications, Vol. 46 of OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2000), pp. 74–76.

Morino, S.

M. Kidowaki, T. Fujiwara, S. Morino, K. Ichimura, J. Stumpe, “Thermal amplification of photoinduced optical anisotropy of p-cyanoazobenzene polymer films monitored by temperature scanning ellipsometry,” Appl. Phys. Lett. 76, 1377–1379 (2000).
[CrossRef]

Mukaida, K.

M. Sato, M. Hayakawa, K. Nakagawa, K. Mukaida, H. Fujiwara, “Synthesis and properties of polyesters having cyanoazobenzene units in the side chain,” Macromol. Rapid Commun. 15, 21–29 (1994).
[CrossRef]

Nakagawa, K.

M. Sato, M. Hayakawa, K. Nakagawa, K. Mukaida, H. Fujiwara, “Synthesis and properties of polyesters having cyanoazobenzene units in the side chain,” Macromol. Rapid Commun. 15, 21–29 (1994).
[CrossRef]

K. Nakagawa, R. Komatsu, H. Fujiwara, M. Sato, “Holographic recording in polyesters having cyanoazobenzene units in the side chain,” in 17th Congress of the International Commission for Optics: Optics for Science and New Technology, J. Chang, J. Lee, C. Nam, eds., Proc. SPIE2778, 571–572 (1996).

Natansohn, A.

F. Langugné Labarthet, P. Rochon, A. Natansohn, “Polarization analysis of diffracted orders from a birefringence grating recorded on azobenzene containing polymer,” Appl. Phys. Lett. 75, 1377–1379 (1999).
[CrossRef]

P. Rochon, J. Gosselin, A. Natansohn, S. Xie, “Optically induced and erased birefringence and dichroism in azoaromatic polymers,” Appl. Phys. Lett. 60, 4–5 (1992).
[CrossRef]

Natansohn, N.

P. Rochon, E. Batalla, N. Natansohn, “Optically induced surface gratings on azoaromatic polymer films,” Appl. Phys. Lett. 66, 136–138 (1995).
[CrossRef]

Niitsu, T.

K. Kawano, J. Minabe, T. Niitsu, T. Ishii, Y. Nishikata, K. Baba, “Optical computing a vector holographic memory system,” Opt. Lett. 25, 1077–1079 (2000).
[CrossRef]

K. Kawano, T. Ishii, J. Minabe, T. Niitsu, Y. Nishikata, K. Baba, “Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain,” Opt. Lett. 24, 1269–1271 (1999).
[CrossRef]

J. Minabe, K. Kawano, Y. Nishikata, T. Ishii, T. Niitsu, K. Baba, “Dark enhancement of optically induced birefringence in azobenzene-containing polyester films,” in Nonlinear Optics: Materials, Fundamentals and Applications, Vol. 46 of OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2000), pp. 74–76.

Nikolova, L.

Nishikata, Y.

K. Kawano, J. Minabe, T. Niitsu, T. Ishii, Y. Nishikata, K. Baba, “Optical computing a vector holographic memory system,” Opt. Lett. 25, 1077–1079 (2000).
[CrossRef]

K. Kawano, T. Ishii, J. Minabe, T. Niitsu, Y. Nishikata, K. Baba, “Holographic recording and retrieval of polarized light by use of polyester containing cyanoazobenzene units in the side chain,” Opt. Lett. 24, 1269–1271 (1999).
[CrossRef]

J. Minabe, K. Kawano, Y. Nishikata, T. Ishii, T. Niitsu, K. Baba, “Dark enhancement of optically induced birefringence in azobenzene-containing polyester films,” in Nonlinear Optics: Materials, Fundamentals and Applications, Vol. 46 of OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2000), pp. 74–76.

Park, L.-S.

O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, L.-S. Park, “Photoinduced phase transition of nematic liquid crystals with donor–acceptor azobenzenes: mechanism of the thermal recovery of the nematic phase,” Phys. Chem. Chem. Phys. 1, 4219–4224 (1999).
[CrossRef]

R. Huber, M.

S. J. Zilker, M. R. Huber, T. Bieringer, D. Haarer, “Holographic recording in amorphous side-chain polymers: a comparison of two different design philosophies,” Appl. Phys. B 68, 893–897 (1999).
[CrossRef]

Ramanujam, P. S.

C. Sánchez, R. Alcalá, S. Hvilsted, P. S. Ramanujam, “Biphotonic holographic gratings in azobenzene polyesters: surface relief phenomena and polarization effects,” Appl. Phys. Lett. 77, 1440–1442 (2000).
[CrossRef]

P. S. Ramanujam, S. Hvilsted, I. Zebger, H. W. Siesler, “On the explanation of the biphotonic processes in polyesters containing azobenzene moieties in the side chain,” Macromol. Rapid Commun. 16, 455–461 (1995).
[CrossRef]

C. Kulinna, I. Zebger, S. Hvilsted, P. S. Ramanujam, H. W. Siesler, “Characterization of the segmental mobility of liquid-crystalline side-chain polyesters by Fourier-transform infrared spectroscopy,” Macromol. Symp. 83, 169–181 (1994).
[CrossRef]

P. S. Ramanujam, S. Hvilsted, F. Andruzzi, “Novel biphotonic holographic storage in a side-chain liquid crystalline polyester,” Appl. Phys. Lett. 62, 1041–1043 (1993).
[CrossRef]

S. Hvilsted, F. Andruzzi, P. S. Ramanujam, “Side-chain liquid-crystalline polyesters for optical information storage,” Opt. Lett. 17, 1234–1236 (1992).
[CrossRef] [PubMed]

Reck, B.

M. Eich, J. H. Wendorff, B. Reck, H. Ringsdorf, “Reversible digital and holographic optical storage in polymeric liquid crystals,” Makromol. Chem. Rapid Commun. 8, 59–63 (1987).
[CrossRef]

Ringsdorf, H.

M. Eich, J. H. Wendorff, B. Reck, H. Ringsdorf, “Reversible digital and holographic optical storage in polymeric liquid crystals,” Makromol. Chem. Rapid Commun. 8, 59–63 (1987).
[CrossRef]

Rochon, P.

F. Langugné Labarthet, P. Rochon, A. Natansohn, “Polarization analysis of diffracted orders from a birefringence grating recorded on azobenzene containing polymer,” Appl. Phys. Lett. 75, 1377–1379 (1999).
[CrossRef]

P. Rochon, E. Batalla, N. Natansohn, “Optically induced surface gratings on azoaromatic polymer films,” Appl. Phys. Lett. 66, 136–138 (1995).
[CrossRef]

P. Rochon, J. Gosselin, A. Natansohn, S. Xie, “Optically induced and erased birefringence and dichroism in azoaromatic polymers,” Appl. Phys. Lett. 60, 4–5 (1992).
[CrossRef]

Rosenhauer, R.

J. Stumpe, T. Fischer, M. Rutloh, R. Rosenhauer, J. G. Meier, “Photoinduced alignment of LC polymers by the combination of photoorientation and thermotropic self-organization,” in Liquid Crystals III, I.-C. Khoo, ed., Proc. SPIE3800, 150–163 (1999).
[CrossRef]

Ruhmann, R.

L. Läsker, J. Stumpe, T. Fischer, M. Rutloh, S. Kostromin, R. Ruhmann, “Influence of supramolecular order on the light-induced reorientation process in photochromic side group polymers,” Mol. Cryst. Liq. Cryst. 261, 371–381 (1995).
[CrossRef]

Rutloh, M.

L. Läsker, J. Stumpe, T. Fischer, M. Rutloh, S. Kostromin, R. Ruhmann, “Influence of supramolecular order on the light-induced reorientation process in photochromic side group polymers,” Mol. Cryst. Liq. Cryst. 261, 371–381 (1995).
[CrossRef]

J. Stumpe, T. Fischer, M. Rutloh, R. Rosenhauer, J. G. Meier, “Photoinduced alignment of LC polymers by the combination of photoorientation and thermotropic self-organization,” in Liquid Crystals III, I.-C. Khoo, ed., Proc. SPIE3800, 150–163 (1999).
[CrossRef]

Sánchez, C.

C. Sánchez, R. Alcalá, S. Hvilsted, P. S. Ramanujam, “Biphotonic holographic gratings in azobenzene polyesters: surface relief phenomena and polarization effects,” Appl. Phys. Lett. 77, 1440–1442 (2000).
[CrossRef]

Sato, M.

M. Sato, M. Hayakawa, K. Nakagawa, K. Mukaida, H. Fujiwara, “Synthesis and properties of polyesters having cyanoazobenzene units in the side chain,” Macromol. Rapid Commun. 15, 21–29 (1994).
[CrossRef]

K. Nakagawa, R. Komatsu, H. Fujiwara, M. Sato, “Holographic recording in polyesters having cyanoazobenzene units in the side chain,” in 17th Congress of the International Commission for Optics: Optics for Science and New Technology, J. Chang, J. Lee, C. Nam, eds., Proc. SPIE2778, 571–572 (1996).

Shiono, T.

O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, L.-S. Park, “Photoinduced phase transition of nematic liquid crystals with donor–acceptor azobenzenes: mechanism of the thermal recovery of the nematic phase,” Phys. Chem. Chem. Phys. 1, 4219–4224 (1999).
[CrossRef]

Siesler, H. W.

C. Kulinna, I. Zebger, S. Hvilsted, P. S. Ramanujam, H. W. Siesler, “Characterization of the segmental mobility of liquid-crystalline side-chain polyesters by Fourier-transform infrared spectroscopy,” Macromol. Symp. 83, 169–181 (1994).
[CrossRef]

Stein, R. S.

S. J. Zilker, T. Bieringer, D. Haarer, R. S. Stein, J. W. van Egmond, S. G. Kostromine, “Holographic data storage in amorphous polymers,” Adv. Mater. 10, 855–859 (1998).
[CrossRef]

Stumpe, J.

M. Kidowaki, T. Fujiwara, S. Morino, K. Ichimura, J. Stumpe, “Thermal amplification of photoinduced optical anisotropy of p-cyanoazobenzene polymer films monitored by temperature scanning ellipsometry,” Appl. Phys. Lett. 76, 1377–1379 (2000).
[CrossRef]

L. Läsker, J. Stumpe, T. Fischer, M. Rutloh, S. Kostromin, R. Ruhmann, “Influence of supramolecular order on the light-induced reorientation process in photochromic side group polymers,” Mol. Cryst. Liq. Cryst. 261, 371–381 (1995).
[CrossRef]

J. Stumpe, T. Fischer, M. Rutloh, R. Rosenhauer, J. G. Meier, “Photoinduced alignment of LC polymers by the combination of photoorientation and thermotropic self-organization,” in Liquid Crystals III, I.-C. Khoo, ed., Proc. SPIE3800, 150–163 (1999).
[CrossRef]

Tang, G.

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

Todorov, T.

Tomova, N.

Tripathy, S. K.

D. Y. Kim, S. K. Tripathy, L. Li, J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995).
[CrossRef]

Tsutsumi, O.

O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, L.-S. Park, “Photoinduced phase transition of nematic liquid crystals with donor–acceptor azobenzenes: mechanism of the thermal recovery of the nematic phase,” Phys. Chem. Chem. Phys. 1, 4219–4224 (1999).
[CrossRef]

van Egmond, J. W.

S. J. Zilker, T. Bieringer, D. Haarer, R. S. Stein, J. W. van Egmond, S. G. Kostromine, “Holographic data storage in amorphous polymers,” Adv. Mater. 10, 855–859 (1998).
[CrossRef]

W. Siesler, H.

P. S. Ramanujam, S. Hvilsted, I. Zebger, H. W. Siesler, “On the explanation of the biphotonic processes in polyesters containing azobenzene moieties in the side chain,” Macromol. Rapid Commun. 16, 455–461 (1995).
[CrossRef]

Wang, L.

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

Wendorff, J. H.

H. Bach, K. Anderle, Th. Fuhrmann, J. H. Wendorff, “Biphoton-induced refractive index change in 4-amino-4′-nitroazobenzene/polycarbonate,” J. Phys. Chem. 100, 4135–4140 (1996).
[CrossRef]

M. Eich, J. H. Wendorff, “Laser-induced gratings and spectroscopy in monodomains of liquid-crystalline polymers,” J. Opt. Soc. Am. B 7, 1428–1436 (1990).
[CrossRef]

M. Eich, J. H. Wendorff, B. Reck, H. Ringsdorf, “Reversible digital and holographic optical storage in polymeric liquid crystals,” Makromol. Chem. Rapid Commun. 8, 59–63 (1987).
[CrossRef]

Wu, P.

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

Xie, S.

P. Rochon, J. Gosselin, A. Natansohn, S. Xie, “Optically induced and erased birefringence and dichroism in azoaromatic polymers,” Appl. Phys. Lett. 60, 4–5 (1992).
[CrossRef]

Xu, J.

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

Zebger, I.

P. S. Ramanujam, S. Hvilsted, I. Zebger, H. W. Siesler, “On the explanation of the biphotonic processes in polyesters containing azobenzene moieties in the side chain,” Macromol. Rapid Commun. 16, 455–461 (1995).
[CrossRef]

C. Kulinna, I. Zebger, S. Hvilsted, P. S. Ramanujam, H. W. Siesler, “Characterization of the segmental mobility of liquid-crystalline side-chain polyesters by Fourier-transform infrared spectroscopy,” Macromol. Symp. 83, 169–181 (1994).
[CrossRef]

Zhang, G.

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

Zilker, S. J.

S. J. Zilker, M. R. Huber, T. Bieringer, D. Haarer, “Holographic recording in amorphous side-chain polymers: a comparison of two different design philosophies,” Appl. Phys. B 68, 893–897 (1999).
[CrossRef]

S. J. Zilker, T. Bieringer, D. Haarer, R. S. Stein, J. W. van Egmond, S. G. Kostromine, “Holographic data storage in amorphous polymers,” Adv. Mater. 10, 855–859 (1998).
[CrossRef]

Zou, B.

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

Adv. Mater.

S. J. Zilker, T. Bieringer, D. Haarer, R. S. Stein, J. W. van Egmond, S. G. Kostromine, “Holographic data storage in amorphous polymers,” Adv. Mater. 10, 855–859 (1998).
[CrossRef]

Appl. Opt.

Appl. Phys. B

S. J. Zilker, M. R. Huber, T. Bieringer, D. Haarer, “Holographic recording in amorphous side-chain polymers: a comparison of two different design philosophies,” Appl. Phys. B 68, 893–897 (1999).
[CrossRef]

Appl. Phys. Lett.

P. Rochon, J. Gosselin, A. Natansohn, S. Xie, “Optically induced and erased birefringence and dichroism in azoaromatic polymers,” Appl. Phys. Lett. 60, 4–5 (1992).
[CrossRef]

F. Langugné Labarthet, P. Rochon, A. Natansohn, “Polarization analysis of diffracted orders from a birefringence grating recorded on azobenzene containing polymer,” Appl. Phys. Lett. 75, 1377–1379 (1999).
[CrossRef]

P. Rochon, E. Batalla, N. Natansohn, “Optically induced surface gratings on azoaromatic polymer films,” Appl. Phys. Lett. 66, 136–138 (1995).
[CrossRef]

D. Y. Kim, S. K. Tripathy, L. Li, J. Kumar, “Laser-induced holographic surface relief gratings on nonlinear optical polymer films,” Appl. Phys. Lett. 66, 1166–1168 (1995).
[CrossRef]

M. Kidowaki, T. Fujiwara, S. Morino, K. Ichimura, J. Stumpe, “Thermal amplification of photoinduced optical anisotropy of p-cyanoazobenzene polymer films monitored by temperature scanning ellipsometry,” Appl. Phys. Lett. 76, 1377–1379 (2000).
[CrossRef]

P. S. Ramanujam, S. Hvilsted, F. Andruzzi, “Novel biphotonic holographic storage in a side-chain liquid crystalline polyester,” Appl. Phys. Lett. 62, 1041–1043 (1993).
[CrossRef]

C. Sánchez, R. Alcalá, S. Hvilsted, P. S. Ramanujam, “Biphotonic holographic gratings in azobenzene polyesters: surface relief phenomena and polarization effects,” Appl. Phys. Lett. 77, 1440–1442 (2000).
[CrossRef]

J. Opt. Soc. Am. B

J. Phys. Chem.

H. Bach, K. Anderle, Th. Fuhrmann, J. H. Wendorff, “Biphoton-induced refractive index change in 4-amino-4′-nitroazobenzene/polycarbonate,” J. Phys. Chem. 100, 4135–4140 (1996).
[CrossRef]

Macromol. Rapid Commun.

M. Sato, M. Hayakawa, K. Nakagawa, K. Mukaida, H. Fujiwara, “Synthesis and properties of polyesters having cyanoazobenzene units in the side chain,” Macromol. Rapid Commun. 15, 21–29 (1994).
[CrossRef]

P. S. Ramanujam, S. Hvilsted, I. Zebger, H. W. Siesler, “On the explanation of the biphotonic processes in polyesters containing azobenzene moieties in the side chain,” Macromol. Rapid Commun. 16, 455–461 (1995).
[CrossRef]

Macromol. Symp.

C. Kulinna, I. Zebger, S. Hvilsted, P. S. Ramanujam, H. W. Siesler, “Characterization of the segmental mobility of liquid-crystalline side-chain polyesters by Fourier-transform infrared spectroscopy,” Macromol. Symp. 83, 169–181 (1994).
[CrossRef]

Makromol. Chem. Rapid Commun.

M. Eich, J. H. Wendorff, B. Reck, H. Ringsdorf, “Reversible digital and holographic optical storage in polymeric liquid crystals,” Makromol. Chem. Rapid Commun. 8, 59–63 (1987).
[CrossRef]

Mol. Cryst. Liq. Cryst.

L. Läsker, J. Stumpe, T. Fischer, M. Rutloh, S. Kostromin, R. Ruhmann, “Influence of supramolecular order on the light-induced reorientation process in photochromic side group polymers,” Mol. Cryst. Liq. Cryst. 261, 371–381 (1995).
[CrossRef]

Opt. Lett.

Phys. Chem. Chem. Phys.

O. Tsutsumi, A. Kanazawa, T. Shiono, T. Ikeda, L.-S. Park, “Photoinduced phase transition of nematic liquid crystals with donor–acceptor azobenzenes: mechanism of the thermal recovery of the nematic phase,” Phys. Chem. Chem. Phys. 1, 4219–4224 (1999).
[CrossRef]

Phys. Rev. B

P. Wu, L. Wang, J. Xu, B. Zou, X. Gong, G. Zhang, G. Tang, W. Chen, “Transient biphotonic grating in photoisomerizative azo materials,” Phys. Rev. B 57, 3874–3880 (1998).
[CrossRef]

Other

K. Nakagawa, R. Komatsu, H. Fujiwara, M. Sato, “Holographic recording in polyesters having cyanoazobenzene units in the side chain,” in 17th Congress of the International Commission for Optics: Optics for Science and New Technology, J. Chang, J. Lee, C. Nam, eds., Proc. SPIE2778, 571–572 (1996).

J. Minabe, K. Kawano, Y. Nishikata, T. Ishii, T. Niitsu, K. Baba, “Dark enhancement of optically induced birefringence in azobenzene-containing polyester films,” in Nonlinear Optics: Materials, Fundamentals and Applications, Vol. 46 of OSA Technical Digest Series (Optical Society of America, Washington, D.C., 2000), pp. 74–76.

J. Stumpe, T. Fischer, M. Rutloh, R. Rosenhauer, J. G. Meier, “Photoinduced alignment of LC polymers by the combination of photoorientation and thermotropic self-organization,” in Liquid Crystals III, I.-C. Khoo, ed., Proc. SPIE3800, 150–163 (1999).
[CrossRef]

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Figures (9)

Fig. 1
Fig. 1

Molecular structure of polyester-containing azobenzene units in the side chain.

Fig. 2
Fig. 2

Experimental setup for holographic recording and retrieval of a test image: λ/2, half-wave; M1–M4, mirrors; PBS, polarization beam splitter; L1–L4, lenses; USAF chart, U.S. Air Force resolution test chart; GLP, Glan laser prism; CCD, charge-coupled device camera.

Fig. 3
Fig. 3

Continuous change in the optically induced birefringence on heating at a rate of 1 K/min. The initial birefringence is induced at 20 °C by irradiation with a linearly polarized pump beam of 1 W/cm2 for 30 min.

Fig. 4
Fig. 4

Thermally assisted recording at 38 °C Tg of the birefringence in the azopolyester films. At point A the linearly polarized pump beam is turned on; at point B the pump beam is turned off. The films are irradiated with the pump beam of 1 W/cm2 for (a) 30 min, (b) 10 min, and (c) 3.3 min.

Fig. 5
Fig. 5

Film-temperature dependence of (a) the birefringence induced by pump beam irradiation for 30 min and (b) the birefringence at 30 min after interception of the pump beam.

Fig. 6
Fig. 6

Multiple writing–erasing sequences at 38 °C Tg and the stability of birefringence at room temperature. The recording condition corresponds to that of Fig. 4, curve (a). At point A the linearly polarized pump beam is turned on; at point B the pump beam is turned off. After point C the film is irradiated with a circularly polarized erasing beam for 8 min. At point D the temperature controller is turned off. The line after point E is data after one day.

Fig. 7
Fig. 7

Thermally assisted recording at 38 °C Tg of the polarization grating in the azopolyester film 2 µm thick. At point A the linearly polarized writing beams are turned on; at point B the writing beams are turned off. The film is irradiated with writing beams of 500 mW/cm2 per beam for 15 min. The inset shows the polarization states of the incident reading beam, I0, and the first positive order diffracted beam, I+1, after the thermally assisted recording.

Fig. 8
Fig. 8

Relative intensities of the diffracted image, USAF chart (2.83 lp/mm), retrieved from the azopolyester film 1.5 µm thick at (a) 1 min, (b) 4 min, and (c) 16 min after interception of the writing beams. The film is held at 38 °C Tg and irradiated with writing beams of 2 W/cm2 for 20 s. The wavelength of the reading beam is 633 nm.

Fig. 9
Fig. 9

Diffracted image, USAF chart, retrieved from the 1.5-µm-thick azopolyester film. The film is held at 38 °C TG and irraditated with writing beams of 2 W/cm2 for 20 s. The wavelength of the reading beam is 515 nm.

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