Abstract

The induced transient dichroism and the transient optical Kerr effect (OKE) response of azo-doped isotropic liquid crystals were studied in picosecond time scale. Photoisomerization occurs when the azo-dye molecules are resonantly excited. As a result, a significant enhancement of OKE signal was found in the dye doped liquid crystals with respect to the pure liquid crystals. The enhancement was attributed to the extra torque exerted on liquid crystals after anisotropic orientational distribution of trans and cis isomers were generated. A modified mean field theory model was applied to treat the interactions of trans and cis isomers with liquid crystals. A small-pump enhancement factor of 3.8 was obtained, which is comparable with that of the well-known anthraquinone dye doped LC system.

© 2006 Optical Society of America

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  1. I. Jánossy, A.D. Lloyd, and B.S. Wherrett, "Anomalous optical Freedericksz transition in an absorbing liquid-crystal," Mol. Cryst. Liq. Cryst. 179, 1-12 (1990).
  2. D. Paparo, L. Marrucci, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Molecular-field-enhanced optical Kerr effect in absorbing liquids," Phys. Rev. Lett. 78, 38-41 (1997).
    [CrossRef]
  3. R. Muenster, M. Jarasch, X. Zhuang, and Y. R. Shen, "Dye-induced enhancement of optical nonlinearity in liquids and liquid crystals," Phys. Rev. Lett. 78, 42-45 (1997).
    [CrossRef]
  4. I. Jánossy and T. Kósa, "Influence of anthraquinone dyes on optical reorientation of nematic liquid crystals," Opt. Lett. 17, 1183-1185 (1992).
    [CrossRef] [PubMed]
  5. I. Jánossy, "Molecular interpretation of the absorption-induced optical reorientation of nematic liquid crystals," Phys. Rev. E 49, 2957-2963 (1994).
    [CrossRef]
  6. L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
    [CrossRef]
  7. M. Kreuzer, L. Marrucci and D. Paparo, "Light-induced modification of kinetic molecular properties: enhancement of optical Kerr effect in absorbing liquids, photoinduced torque and molecular motors in dye-doped nematics," J. Nonlinear Opt. Phys. Mater. 9, 157-182 (2000).
  8. M. Kreuzer, F. Hanisch, R. Eidenschink, D. Paparo, and L. Marrucci, "Large deuterium isotope effect in the optical nonlinearity of dye-doped liquid crystals," Phys. Rev. Lett. 88, 013902 (2002).
    [CrossRef] [PubMed]
  9. T. V. Truong, L. Xu, and Y. R. Shen, "Early dynamics of guest-host interaction in dye-doped liquid crystalline materials," Phys. Rev. Lett. 90, 193902 (2003).
    [CrossRef] [PubMed]
  10. M. I. Barnik, A. S. Zolotko, V. G. Rumyantseva, D. B. Terskov, "Photoinduced director reorientation in aza-dye-doped nematic liquid-crystal," Kristallografiya 40, 746-750 (1995).
  11. I. Jánossy and L. Szabados, "Optical reorientation of nematic liquid crystals in the presence of photoisomerization," Phys. Rev. E 58, 4598-4604 (1998).
    [CrossRef]
  12. M. Becchi, I. Janossy, D. S. Shankar Rao, and D. Statman, "Anomalous intensity dependence of optical reorientation in azo-dye-doped nematic liquid crystals," Phys. Rev. E 69, 051707 (2004).
    [CrossRef]
  13. M. Kreuzer, E. Benkler, D. Paparo, G. Casillo, and L. Marrucci, "Molecular reorientation by photoinduced modulation of rotational mobility," Phys. Rev. E 68, 011701 (2003).
    [CrossRef]
  14. B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
    [CrossRef]
  15. A. Zeug, I. Ruckman, and B. Roder, "Picosecond transient dichroism and birefringence spectroscopy on pheophorbide-a molecules in solution," J. Opt. B 3,S251-S258 (2001).
    [CrossRef]
  16. Liyong Ji, Pei Yang, Xiu Liu, Liying Liu and Lei Xu, unpublished results.

2004 (2)

M. Becchi, I. Janossy, D. S. Shankar Rao, and D. Statman, "Anomalous intensity dependence of optical reorientation in azo-dye-doped nematic liquid crystals," Phys. Rev. E 69, 051707 (2004).
[CrossRef]

B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
[CrossRef]

2003 (2)

M. Kreuzer, E. Benkler, D. Paparo, G. Casillo, and L. Marrucci, "Molecular reorientation by photoinduced modulation of rotational mobility," Phys. Rev. E 68, 011701 (2003).
[CrossRef]

T. V. Truong, L. Xu, and Y. R. Shen, "Early dynamics of guest-host interaction in dye-doped liquid crystalline materials," Phys. Rev. Lett. 90, 193902 (2003).
[CrossRef] [PubMed]

2002 (1)

M. Kreuzer, F. Hanisch, R. Eidenschink, D. Paparo, and L. Marrucci, "Large deuterium isotope effect in the optical nonlinearity of dye-doped liquid crystals," Phys. Rev. Lett. 88, 013902 (2002).
[CrossRef] [PubMed]

2001 (1)

A. Zeug, I. Ruckman, and B. Roder, "Picosecond transient dichroism and birefringence spectroscopy on pheophorbide-a molecules in solution," J. Opt. B 3,S251-S258 (2001).
[CrossRef]

2000 (1)

M. Kreuzer, L. Marrucci and D. Paparo, "Light-induced modification of kinetic molecular properties: enhancement of optical Kerr effect in absorbing liquids, photoinduced torque and molecular motors in dye-doped nematics," J. Nonlinear Opt. Phys. Mater. 9, 157-182 (2000).

1998 (2)

L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
[CrossRef]

I. Jánossy and L. Szabados, "Optical reorientation of nematic liquid crystals in the presence of photoisomerization," Phys. Rev. E 58, 4598-4604 (1998).
[CrossRef]

1997 (2)

D. Paparo, L. Marrucci, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Molecular-field-enhanced optical Kerr effect in absorbing liquids," Phys. Rev. Lett. 78, 38-41 (1997).
[CrossRef]

R. Muenster, M. Jarasch, X. Zhuang, and Y. R. Shen, "Dye-induced enhancement of optical nonlinearity in liquids and liquid crystals," Phys. Rev. Lett. 78, 42-45 (1997).
[CrossRef]

1995 (1)

M. I. Barnik, A. S. Zolotko, V. G. Rumyantseva, D. B. Terskov, "Photoinduced director reorientation in aza-dye-doped nematic liquid-crystal," Kristallografiya 40, 746-750 (1995).

1994 (1)

I. Jánossy, "Molecular interpretation of the absorption-induced optical reorientation of nematic liquid crystals," Phys. Rev. E 49, 2957-2963 (1994).
[CrossRef]

1992 (1)

1990 (1)

I. Jánossy, A.D. Lloyd, and B.S. Wherrett, "Anomalous optical Freedericksz transition in an absorbing liquid-crystal," Mol. Cryst. Liq. Cryst. 179, 1-12 (1990).

Abbate, G.

L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
[CrossRef]

D. Paparo, L. Marrucci, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Molecular-field-enhanced optical Kerr effect in absorbing liquids," Phys. Rev. Lett. 78, 38-41 (1997).
[CrossRef]

Barnik, M. I.

M. I. Barnik, A. S. Zolotko, V. G. Rumyantseva, D. B. Terskov, "Photoinduced director reorientation in aza-dye-doped nematic liquid-crystal," Kristallografiya 40, 746-750 (1995).

Becchi, M.

M. Becchi, I. Janossy, D. S. Shankar Rao, and D. Statman, "Anomalous intensity dependence of optical reorientation in azo-dye-doped nematic liquid crystals," Phys. Rev. E 69, 051707 (2004).
[CrossRef]

Benkler, E.

M. Kreuzer, E. Benkler, D. Paparo, G. Casillo, and L. Marrucci, "Molecular reorientation by photoinduced modulation of rotational mobility," Phys. Rev. E 68, 011701 (2003).
[CrossRef]

Braun, M.

B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
[CrossRef]

Casillo, G.

M. Kreuzer, E. Benkler, D. Paparo, G. Casillo, and L. Marrucci, "Molecular reorientation by photoinduced modulation of rotational mobility," Phys. Rev. E 68, 011701 (2003).
[CrossRef]

Eidenschink, R.

M. Kreuzer, F. Hanisch, R. Eidenschink, D. Paparo, and L. Marrucci, "Large deuterium isotope effect in the optical nonlinearity of dye-doped liquid crystals," Phys. Rev. Lett. 88, 013902 (2002).
[CrossRef] [PubMed]

Gilch, P.

B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
[CrossRef]

Hanisch, F.

M. Kreuzer, F. Hanisch, R. Eidenschink, D. Paparo, and L. Marrucci, "Large deuterium isotope effect in the optical nonlinearity of dye-doped liquid crystals," Phys. Rev. Lett. 88, 013902 (2002).
[CrossRef] [PubMed]

Janossy, I.

M. Becchi, I. Janossy, D. S. Shankar Rao, and D. Statman, "Anomalous intensity dependence of optical reorientation in azo-dye-doped nematic liquid crystals," Phys. Rev. E 69, 051707 (2004).
[CrossRef]

Jánossy, I.

I. Jánossy and L. Szabados, "Optical reorientation of nematic liquid crystals in the presence of photoisomerization," Phys. Rev. E 58, 4598-4604 (1998).
[CrossRef]

I. Jánossy, "Molecular interpretation of the absorption-induced optical reorientation of nematic liquid crystals," Phys. Rev. E 49, 2957-2963 (1994).
[CrossRef]

I. Jánossy and T. Kósa, "Influence of anthraquinone dyes on optical reorientation of nematic liquid crystals," Opt. Lett. 17, 1183-1185 (1992).
[CrossRef] [PubMed]

I. Jánossy, A.D. Lloyd, and B.S. Wherrett, "Anomalous optical Freedericksz transition in an absorbing liquid-crystal," Mol. Cryst. Liq. Cryst. 179, 1-12 (1990).

Jarasch, M.

R. Muenster, M. Jarasch, X. Zhuang, and Y. R. Shen, "Dye-induced enhancement of optical nonlinearity in liquids and liquid crystals," Phys. Rev. Lett. 78, 42-45 (1997).
[CrossRef]

Kósa, T.

Kreuzer, M.

M. Kreuzer, E. Benkler, D. Paparo, G. Casillo, and L. Marrucci, "Molecular reorientation by photoinduced modulation of rotational mobility," Phys. Rev. E 68, 011701 (2003).
[CrossRef]

M. Kreuzer, F. Hanisch, R. Eidenschink, D. Paparo, and L. Marrucci, "Large deuterium isotope effect in the optical nonlinearity of dye-doped liquid crystals," Phys. Rev. Lett. 88, 013902 (2002).
[CrossRef] [PubMed]

M. Kreuzer, L. Marrucci and D. Paparo, "Light-induced modification of kinetic molecular properties: enhancement of optical Kerr effect in absorbing liquids, photoinduced torque and molecular motors in dye-doped nematics," J. Nonlinear Opt. Phys. Mater. 9, 157-182 (2000).

L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
[CrossRef]

D. Paparo, L. Marrucci, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Molecular-field-enhanced optical Kerr effect in absorbing liquids," Phys. Rev. Lett. 78, 38-41 (1997).
[CrossRef]

Laimgruber, S.

B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
[CrossRef]

Lehnert, P.

L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
[CrossRef]

D. Paparo, L. Marrucci, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Molecular-field-enhanced optical Kerr effect in absorbing liquids," Phys. Rev. Lett. 78, 38-41 (1997).
[CrossRef]

Lloyd, A.D.

I. Jánossy, A.D. Lloyd, and B.S. Wherrett, "Anomalous optical Freedericksz transition in an absorbing liquid-crystal," Mol. Cryst. Liq. Cryst. 179, 1-12 (1990).

Malkmus, S.

B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
[CrossRef]

Marrucci, L.

M. Kreuzer, E. Benkler, D. Paparo, G. Casillo, and L. Marrucci, "Molecular reorientation by photoinduced modulation of rotational mobility," Phys. Rev. E 68, 011701 (2003).
[CrossRef]

M. Kreuzer, F. Hanisch, R. Eidenschink, D. Paparo, and L. Marrucci, "Large deuterium isotope effect in the optical nonlinearity of dye-doped liquid crystals," Phys. Rev. Lett. 88, 013902 (2002).
[CrossRef] [PubMed]

M. Kreuzer, L. Marrucci and D. Paparo, "Light-induced modification of kinetic molecular properties: enhancement of optical Kerr effect in absorbing liquids, photoinduced torque and molecular motors in dye-doped nematics," J. Nonlinear Opt. Phys. Mater. 9, 157-182 (2000).

L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
[CrossRef]

D. Paparo, L. Marrucci, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Molecular-field-enhanced optical Kerr effect in absorbing liquids," Phys. Rev. Lett. 78, 38-41 (1997).
[CrossRef]

Muenster, R.

R. Muenster, M. Jarasch, X. Zhuang, and Y. R. Shen, "Dye-induced enhancement of optical nonlinearity in liquids and liquid crystals," Phys. Rev. Lett. 78, 42-45 (1997).
[CrossRef]

Paparo, D.

M. Kreuzer, E. Benkler, D. Paparo, G. Casillo, and L. Marrucci, "Molecular reorientation by photoinduced modulation of rotational mobility," Phys. Rev. E 68, 011701 (2003).
[CrossRef]

M. Kreuzer, F. Hanisch, R. Eidenschink, D. Paparo, and L. Marrucci, "Large deuterium isotope effect in the optical nonlinearity of dye-doped liquid crystals," Phys. Rev. Lett. 88, 013902 (2002).
[CrossRef] [PubMed]

M. Kreuzer, L. Marrucci and D. Paparo, "Light-induced modification of kinetic molecular properties: enhancement of optical Kerr effect in absorbing liquids, photoinduced torque and molecular motors in dye-doped nematics," J. Nonlinear Opt. Phys. Mater. 9, 157-182 (2000).

L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
[CrossRef]

D. Paparo, L. Marrucci, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Molecular-field-enhanced optical Kerr effect in absorbing liquids," Phys. Rev. Lett. 78, 38-41 (1997).
[CrossRef]

Roder, B.

A. Zeug, I. Ruckman, and B. Roder, "Picosecond transient dichroism and birefringence spectroscopy on pheophorbide-a molecules in solution," J. Opt. B 3,S251-S258 (2001).
[CrossRef]

Ruckman, I.

A. Zeug, I. Ruckman, and B. Roder, "Picosecond transient dichroism and birefringence spectroscopy on pheophorbide-a molecules in solution," J. Opt. B 3,S251-S258 (2001).
[CrossRef]

Rumyantseva, V. G.

M. I. Barnik, A. S. Zolotko, V. G. Rumyantseva, D. B. Terskov, "Photoinduced director reorientation in aza-dye-doped nematic liquid-crystal," Kristallografiya 40, 746-750 (1995).

Santamato, E.

L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
[CrossRef]

D. Paparo, L. Marrucci, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Molecular-field-enhanced optical Kerr effect in absorbing liquids," Phys. Rev. Lett. 78, 38-41 (1997).
[CrossRef]

Schmidt, B.

B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
[CrossRef]

Shankar Rao, D. S.

M. Becchi, I. Janossy, D. S. Shankar Rao, and D. Statman, "Anomalous intensity dependence of optical reorientation in azo-dye-doped nematic liquid crystals," Phys. Rev. E 69, 051707 (2004).
[CrossRef]

Shen, Y. R.

T. V. Truong, L. Xu, and Y. R. Shen, "Early dynamics of guest-host interaction in dye-doped liquid crystalline materials," Phys. Rev. Lett. 90, 193902 (2003).
[CrossRef] [PubMed]

R. Muenster, M. Jarasch, X. Zhuang, and Y. R. Shen, "Dye-induced enhancement of optical nonlinearity in liquids and liquid crystals," Phys. Rev. Lett. 78, 42-45 (1997).
[CrossRef]

Sobotta, C.

B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
[CrossRef]

Statman, D.

M. Becchi, I. Janossy, D. S. Shankar Rao, and D. Statman, "Anomalous intensity dependence of optical reorientation in azo-dye-doped nematic liquid crystals," Phys. Rev. E 69, 051707 (2004).
[CrossRef]

Szabados, L.

I. Jánossy and L. Szabados, "Optical reorientation of nematic liquid crystals in the presence of photoisomerization," Phys. Rev. E 58, 4598-4604 (1998).
[CrossRef]

Terskov, D. B.

M. I. Barnik, A. S. Zolotko, V. G. Rumyantseva, D. B. Terskov, "Photoinduced director reorientation in aza-dye-doped nematic liquid-crystal," Kristallografiya 40, 746-750 (1995).

Truong, T. V.

T. V. Truong, L. Xu, and Y. R. Shen, "Early dynamics of guest-host interaction in dye-doped liquid crystalline materials," Phys. Rev. Lett. 90, 193902 (2003).
[CrossRef] [PubMed]

Vogeler, T.

L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
[CrossRef]

D. Paparo, L. Marrucci, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Molecular-field-enhanced optical Kerr effect in absorbing liquids," Phys. Rev. Lett. 78, 38-41 (1997).
[CrossRef]

Wherrett, B.S.

I. Jánossy, A.D. Lloyd, and B.S. Wherrett, "Anomalous optical Freedericksz transition in an absorbing liquid-crystal," Mol. Cryst. Liq. Cryst. 179, 1-12 (1990).

Xu, L.

T. V. Truong, L. Xu, and Y. R. Shen, "Early dynamics of guest-host interaction in dye-doped liquid crystalline materials," Phys. Rev. Lett. 90, 193902 (2003).
[CrossRef] [PubMed]

Zeug, A.

A. Zeug, I. Ruckman, and B. Roder, "Picosecond transient dichroism and birefringence spectroscopy on pheophorbide-a molecules in solution," J. Opt. B 3,S251-S258 (2001).
[CrossRef]

Zhuang, X.

R. Muenster, M. Jarasch, X. Zhuang, and Y. R. Shen, "Dye-induced enhancement of optical nonlinearity in liquids and liquid crystals," Phys. Rev. Lett. 78, 42-45 (1997).
[CrossRef]

Zinth, W.

B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
[CrossRef]

Zolotko, A. S.

M. I. Barnik, A. S. Zolotko, V. G. Rumyantseva, D. B. Terskov, "Photoinduced director reorientation in aza-dye-doped nematic liquid-crystal," Kristallografiya 40, 746-750 (1995).

J. Nonlinear Opt. Phys. Mater. (1)

M. Kreuzer, L. Marrucci and D. Paparo, "Light-induced modification of kinetic molecular properties: enhancement of optical Kerr effect in absorbing liquids, photoinduced torque and molecular motors in dye-doped nematics," J. Nonlinear Opt. Phys. Mater. 9, 157-182 (2000).

J. Opt. B (1)

A. Zeug, I. Ruckman, and B. Roder, "Picosecond transient dichroism and birefringence spectroscopy on pheophorbide-a molecules in solution," J. Opt. B 3,S251-S258 (2001).
[CrossRef]

J. Phys. Chem. A (1)

B. Schmidt, C. Sobotta, S. Malkmus, S. Laimgruber, M. Braun, W. Zinth, and P. Gilch, "Femtosecond fluorescence and absorption dynamics of an azobenzene with a strong push-pull substitution," J. Phys. Chem. A 108, 4399-4404 (2004).
[CrossRef]

Kristallografiya (1)

M. I. Barnik, A. S. Zolotko, V. G. Rumyantseva, D. B. Terskov, "Photoinduced director reorientation in aza-dye-doped nematic liquid-crystal," Kristallografiya 40, 746-750 (1995).

Mol. Cryst. Liq. Cryst. (1)

I. Jánossy, A.D. Lloyd, and B.S. Wherrett, "Anomalous optical Freedericksz transition in an absorbing liquid-crystal," Mol. Cryst. Liq. Cryst. 179, 1-12 (1990).

Opt. Lett. (1)

Phys. Rev. A (1)

L. Marrucci, D. Paparo, G. Abbate, E. Santamato, M. Kreuzer, P. Lehnert, and T. Vogeler, "Enhanced optical nonlinearity by photoinduced molecular orientation in absorbing liquids," Phys. Rev. A 58, 4926-4936 (1998).
[CrossRef]

Phys. Rev. E (4)

I. Jánossy, "Molecular interpretation of the absorption-induced optical reorientation of nematic liquid crystals," Phys. Rev. E 49, 2957-2963 (1994).
[CrossRef]

I. Jánossy and L. Szabados, "Optical reorientation of nematic liquid crystals in the presence of photoisomerization," Phys. Rev. E 58, 4598-4604 (1998).
[CrossRef]

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[CrossRef]

M. Kreuzer, E. Benkler, D. Paparo, G. Casillo, and L. Marrucci, "Molecular reorientation by photoinduced modulation of rotational mobility," Phys. Rev. E 68, 011701 (2003).
[CrossRef]

Phys. Rev. Lett. (4)

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[CrossRef]

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[CrossRef]

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[CrossRef] [PubMed]

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[CrossRef] [PubMed]

Other (1)

Liyong Ji, Pei Yang, Xiu Liu, Liying Liu and Lei Xu, unpublished results.

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Figures (4)

Fig. 1
Fig. 1

Time resolved transient absorbance observed at 520nm. Rotational decay lifetimes 1815±148ps and 227±47ps were obtained by bi-exponential fitting (solid line).

Fig. 2.
Fig. 2.

Relation of A1/A2 to pump intensity. The solid line is a saturation fitting which yields a saturation pump intensity of 15.2 mJ/cm2.

Fig. 3.
Fig. 3.

The time resolved square root of OKE signal of the azo-doped LC and pure LC. Theoretical fitting was done by using Eq. (11).

Fig. 4.
Fig. 4.

The enhancement factor (solid circles) vs. pump intensity. Solid line is a fitted line in terms of Eq. (12). The pump intensity dependent OKE signals from pure LC (open squares) and azo-dye-doped LC (open triangles) were also plotted.

Tables (1)

Tables Icon

Table 1. The results of the transient dichromism measurement at several wavelengths.

Equations (16)

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( α ( t ) α ( 0 ) ) d = ln [ I ( t ) I ( 0 ) ] ,
( α ( t ) α ( 0 ) ) d = ln [ I ( t ) I ( 0 ) ] ( α // ( t ) α // ( 0 ) ) d = ln [ I // ( t ) I // ( 0 ) ] ,
Δ α ( t ) d = ( α // ( t ) α ( t ) ) d = ln [ I ( t ) I // ( t ) ] .
Q i ( t ) = Q i 0 exp ( t τ i ) ,
α // ( t ) = i σ i [ N i ( t ) + 2 A i Q i ( t ) ] 3
α ( t ) = i σ i [ N i ( t ) A i Q i ( t ) ] 3
Δ α ( t ) = α ( t ) α ( t ) = i σ i A i Q i ( t ) .
Δ α ( t ) = α ( t ) α ( t ) A 1 exp ( t τ c ) + A 2 exp ( t τ t ) .
A 1 = A c σ c Q c 0 , A 2 = A t σ t Q t 0
( t + 1 τ t ) Q t ( t ) = 2 I ( t ) 5 h v [ α c P c t ϕ c t Q c ( t ) α t ϕ t c ]
( t + 1 τ c ) Q c ( t ) = 2 I ( t ) 5 h v [ α t P t c ϕ t c Q t ( t ) α c ϕ c t ]
( t + 1 τ t ) Q t ( t ) = α t ϕ t c 2 I ( t ) 5 h v .
( t + 1 τ c ) Q c ( t ) = α c ϕ c t 2 I ( t ) 5 h v
Q h ( t ) A t [ I 0 ( t ) + η t 1 Q t ( t ) + η c 1 Q c ( t ) ] e ( t t ) τ h 1 d t + B t [ I 0 ( t ) + η t 2 Q t ( t ) + η c 2 Q c ( t ) ] e ( t t ) τ h 2 d t .
S ( t ) [ δ n ( t ) ] 2 [ Q h ( t ) ] 2 .
η ( I ) η c ( 1 + I I s ) ,

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