Abstract

A new approach based on the use of cholesteric liquid crystals (CLCs) and dye-doped light-sensitive chiral dopants was employed to create lasing materials with reversible tuning and switching. The lasing wavelength of optically-pumped dye-doped cholesteric liquid crystals (CLCs) is shifted by irradiation with UV light. The shift depends on the UV light exposure. Lasing is switched off at high levels of UV light irradiation. A qualitative model describing different lasing regimes is proposed.

© 2005 Optical Society of America

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  1. I. P. Ilchishin, E. A. Tikhonov, V.G. Tischenko, and M.T. Shpak, “Generation of tunable radiation by impurity cholesteric liquid crystals,” JETP Lett. 32, 27–30 (1981).
  2. V. I. Kopp, Z. Q. Zhang, and A. Z. Genack, “Large coherence area thin film stop-band lasers,” Phys. Rev. Lett. 86, 1753–1756 (2001).
    [Crossref] [PubMed]
  3. H. Finkelman, S. D. Kim, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Tunable mirrorless lasing in cholesteric liquid crystalline elastomers,” Adv. Mat. 13, 1069–1071 (2001).
    [Crossref]
  4. W. Cao, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Lasing in a three-dimensional photonic crystal of the liquid crystal blue phase II,” Nature Mat. 1, 111 (2002).
    [Crossref]
  5. P. V. Shibaev, V. Kopp, A. Z. Genack, and M. Green, “Lasing from a stiff chain polymeric lyotropic liquid crystal,” Macromolecules 35, 3022–3025 (2002).
    [Crossref]
  6. P. V. Shibaev, V. Kopp, and A. Z. Genack, “Photonic materials based on mixtures of cholesteric liquid crystals with polymers,” J. Phys. Chem. B 107, 6961–6964 (2003).
    [Crossref]
  7. V. P. Shibaev, A. Bobrovsky, and N. Boiko, “Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties,” Prog. Polym. Sci. 28, 729–836 (2003).
    [Crossref]
  8. P. V. Shibaev, J. Madsen, and A. Z. Genack, “Lasing and narrowing of spontaneous emission from responsive cholesteric films,” Chem. Mat. 16, 1397–1399 (2004).
    [Crossref]
  9. A. Y. G. Fuh and T. H. Lin, “Lasing in chiral photonic liquid crystals and associated frequency tuning,” Optics Express 12, 1857–1863 (2004).
    [Crossref] [PubMed]
  10. S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, “Phototunable photonic bandgap in a chiral liquid crystal laser device,” Appl. Phys. Lett. 84, 2491–2493 (2004).
    [Crossref]
  11. A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
    [Crossref]
  12. I.P. Ilchishin, O. Yaroshchuk, S.V. Gryshchenko, and E.A. Shaydiuk, “Influence of the light induced molecular transformations on the helix pitch and lasing spectra of cholesteric liquid crystals,” Proc. SPIE,  5507, 229–234 (2004).
    [Crossref]
  13. A. Bobrovsky, N. Boiko, V. Shibaev, and J. Wendorff, “Photoinduced textural and optical changes in a cholesteric copolymer with azobenzene-containing side groups,” Liquid Crystals 31, 351–359 (2004).
    [Crossref]
  14. A. N. Bogdanov, “Theory of spherulitic domains in cholesteric liquid crystals with positive dielectric anisotropy,” JETP Lett. 71, 85–88, (2000).
    [Crossref]

2004 (6)

P. V. Shibaev, J. Madsen, and A. Z. Genack, “Lasing and narrowing of spontaneous emission from responsive cholesteric films,” Chem. Mat. 16, 1397–1399 (2004).
[Crossref]

A. Y. G. Fuh and T. H. Lin, “Lasing in chiral photonic liquid crystals and associated frequency tuning,” Optics Express 12, 1857–1863 (2004).
[Crossref] [PubMed]

S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, “Phototunable photonic bandgap in a chiral liquid crystal laser device,” Appl. Phys. Lett. 84, 2491–2493 (2004).
[Crossref]

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

I.P. Ilchishin, O. Yaroshchuk, S.V. Gryshchenko, and E.A. Shaydiuk, “Influence of the light induced molecular transformations on the helix pitch and lasing spectra of cholesteric liquid crystals,” Proc. SPIE,  5507, 229–234 (2004).
[Crossref]

A. Bobrovsky, N. Boiko, V. Shibaev, and J. Wendorff, “Photoinduced textural and optical changes in a cholesteric copolymer with azobenzene-containing side groups,” Liquid Crystals 31, 351–359 (2004).
[Crossref]

2003 (2)

P. V. Shibaev, V. Kopp, and A. Z. Genack, “Photonic materials based on mixtures of cholesteric liquid crystals with polymers,” J. Phys. Chem. B 107, 6961–6964 (2003).
[Crossref]

V. P. Shibaev, A. Bobrovsky, and N. Boiko, “Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties,” Prog. Polym. Sci. 28, 729–836 (2003).
[Crossref]

2002 (2)

W. Cao, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Lasing in a three-dimensional photonic crystal of the liquid crystal blue phase II,” Nature Mat. 1, 111 (2002).
[Crossref]

P. V. Shibaev, V. Kopp, A. Z. Genack, and M. Green, “Lasing from a stiff chain polymeric lyotropic liquid crystal,” Macromolecules 35, 3022–3025 (2002).
[Crossref]

2001 (2)

V. I. Kopp, Z. Q. Zhang, and A. Z. Genack, “Large coherence area thin film stop-band lasers,” Phys. Rev. Lett. 86, 1753–1756 (2001).
[Crossref] [PubMed]

H. Finkelman, S. D. Kim, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Tunable mirrorless lasing in cholesteric liquid crystalline elastomers,” Adv. Mat. 13, 1069–1071 (2001).
[Crossref]

2000 (1)

A. N. Bogdanov, “Theory of spherulitic domains in cholesteric liquid crystals with positive dielectric anisotropy,” JETP Lett. 71, 85–88, (2000).
[Crossref]

1981 (1)

I. P. Ilchishin, E. A. Tikhonov, V.G. Tischenko, and M.T. Shpak, “Generation of tunable radiation by impurity cholesteric liquid crystals,” JETP Lett. 32, 27–30 (1981).

Barberi, R.

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

Bartolino, R.

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

Bobrovsky, A.

A. Bobrovsky, N. Boiko, V. Shibaev, and J. Wendorff, “Photoinduced textural and optical changes in a cholesteric copolymer with azobenzene-containing side groups,” Liquid Crystals 31, 351–359 (2004).
[Crossref]

V. P. Shibaev, A. Bobrovsky, and N. Boiko, “Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties,” Prog. Polym. Sci. 28, 729–836 (2003).
[Crossref]

Bogdanov, A. N.

A. N. Bogdanov, “Theory of spherulitic domains in cholesteric liquid crystals with positive dielectric anisotropy,” JETP Lett. 71, 85–88, (2000).
[Crossref]

Boiko, N.

A. Bobrovsky, N. Boiko, V. Shibaev, and J. Wendorff, “Photoinduced textural and optical changes in a cholesteric copolymer with azobenzene-containing side groups,” Liquid Crystals 31, 351–359 (2004).
[Crossref]

V. P. Shibaev, A. Bobrovsky, and N. Boiko, “Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties,” Prog. Polym. Sci. 28, 729–836 (2003).
[Crossref]

Cao, W.

W. Cao, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Lasing in a three-dimensional photonic crystal of the liquid crystal blue phase II,” Nature Mat. 1, 111 (2002).
[Crossref]

Chanishvili, A.

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

Chilaya, G.

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

Cipparone, G.

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

Finkelman, H.

H. Finkelman, S. D. Kim, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Tunable mirrorless lasing in cholesteric liquid crystalline elastomers,” Adv. Mat. 13, 1069–1071 (2001).
[Crossref]

Fuh, A. Y. G.

A. Y. G. Fuh and T. H. Lin, “Lasing in chiral photonic liquid crystals and associated frequency tuning,” Optics Express 12, 1857–1863 (2004).
[Crossref] [PubMed]

Furumi, S.

S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, “Phototunable photonic bandgap in a chiral liquid crystal laser device,” Appl. Phys. Lett. 84, 2491–2493 (2004).
[Crossref]

Genack, A. Z.

P. V. Shibaev, J. Madsen, and A. Z. Genack, “Lasing and narrowing of spontaneous emission from responsive cholesteric films,” Chem. Mat. 16, 1397–1399 (2004).
[Crossref]

P. V. Shibaev, V. Kopp, and A. Z. Genack, “Photonic materials based on mixtures of cholesteric liquid crystals with polymers,” J. Phys. Chem. B 107, 6961–6964 (2003).
[Crossref]

P. V. Shibaev, V. Kopp, A. Z. Genack, and M. Green, “Lasing from a stiff chain polymeric lyotropic liquid crystal,” Macromolecules 35, 3022–3025 (2002).
[Crossref]

V. I. Kopp, Z. Q. Zhang, and A. Z. Genack, “Large coherence area thin film stop-band lasers,” Phys. Rev. Lett. 86, 1753–1756 (2001).
[Crossref] [PubMed]

Green, M.

P. V. Shibaev, V. Kopp, A. Z. Genack, and M. Green, “Lasing from a stiff chain polymeric lyotropic liquid crystal,” Macromolecules 35, 3022–3025 (2002).
[Crossref]

Gryshchenko, S.V.

I.P. Ilchishin, O. Yaroshchuk, S.V. Gryshchenko, and E.A. Shaydiuk, “Influence of the light induced molecular transformations on the helix pitch and lasing spectra of cholesteric liquid crystals,” Proc. SPIE,  5507, 229–234 (2004).
[Crossref]

Ilchishin, I. P.

I. P. Ilchishin, E. A. Tikhonov, V.G. Tischenko, and M.T. Shpak, “Generation of tunable radiation by impurity cholesteric liquid crystals,” JETP Lett. 32, 27–30 (1981).

Ilchishin, I.P.

I.P. Ilchishin, O. Yaroshchuk, S.V. Gryshchenko, and E.A. Shaydiuk, “Influence of the light induced molecular transformations on the helix pitch and lasing spectra of cholesteric liquid crystals,” Proc. SPIE,  5507, 229–234 (2004).
[Crossref]

Kim, S. D.

H. Finkelman, S. D. Kim, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Tunable mirrorless lasing in cholesteric liquid crystalline elastomers,” Adv. Mat. 13, 1069–1071 (2001).
[Crossref]

Kopp, V.

P. V. Shibaev, V. Kopp, and A. Z. Genack, “Photonic materials based on mixtures of cholesteric liquid crystals with polymers,” J. Phys. Chem. B 107, 6961–6964 (2003).
[Crossref]

P. V. Shibaev, V. Kopp, A. Z. Genack, and M. Green, “Lasing from a stiff chain polymeric lyotropic liquid crystal,” Macromolecules 35, 3022–3025 (2002).
[Crossref]

Kopp, V. I.

V. I. Kopp, Z. Q. Zhang, and A. Z. Genack, “Large coherence area thin film stop-band lasers,” Phys. Rev. Lett. 86, 1753–1756 (2001).
[Crossref] [PubMed]

Lin, T. H.

A. Y. G. Fuh and T. H. Lin, “Lasing in chiral photonic liquid crystals and associated frequency tuning,” Optics Express 12, 1857–1863 (2004).
[Crossref] [PubMed]

Madsen, J.

P. V. Shibaev, J. Madsen, and A. Z. Genack, “Lasing and narrowing of spontaneous emission from responsive cholesteric films,” Chem. Mat. 16, 1397–1399 (2004).
[Crossref]

Mashiko, S.

S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, “Phototunable photonic bandgap in a chiral liquid crystal laser device,” Appl. Phys. Lett. 84, 2491–2493 (2004).
[Crossref]

Mazzulla, A.

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

Munoz, A.

W. Cao, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Lasing in a three-dimensional photonic crystal of the liquid crystal blue phase II,” Nature Mat. 1, 111 (2002).
[Crossref]

H. Finkelman, S. D. Kim, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Tunable mirrorless lasing in cholesteric liquid crystalline elastomers,” Adv. Mat. 13, 1069–1071 (2001).
[Crossref]

Oriol, L.

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

Otomo, A.

S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, “Phototunable photonic bandgap in a chiral liquid crystal laser device,” Appl. Phys. Lett. 84, 2491–2493 (2004).
[Crossref]

Palffy-Muhoray, P.

W. Cao, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Lasing in a three-dimensional photonic crystal of the liquid crystal blue phase II,” Nature Mat. 1, 111 (2002).
[Crossref]

H. Finkelman, S. D. Kim, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Tunable mirrorless lasing in cholesteric liquid crystalline elastomers,” Adv. Mat. 13, 1069–1071 (2001).
[Crossref]

Petriashvili, G.

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

Shaydiuk, E.A.

I.P. Ilchishin, O. Yaroshchuk, S.V. Gryshchenko, and E.A. Shaydiuk, “Influence of the light induced molecular transformations on the helix pitch and lasing spectra of cholesteric liquid crystals,” Proc. SPIE,  5507, 229–234 (2004).
[Crossref]

Shibaev, P. V.

P. V. Shibaev, J. Madsen, and A. Z. Genack, “Lasing and narrowing of spontaneous emission from responsive cholesteric films,” Chem. Mat. 16, 1397–1399 (2004).
[Crossref]

P. V. Shibaev, V. Kopp, and A. Z. Genack, “Photonic materials based on mixtures of cholesteric liquid crystals with polymers,” J. Phys. Chem. B 107, 6961–6964 (2003).
[Crossref]

P. V. Shibaev, V. Kopp, A. Z. Genack, and M. Green, “Lasing from a stiff chain polymeric lyotropic liquid crystal,” Macromolecules 35, 3022–3025 (2002).
[Crossref]

Shibaev, V.

A. Bobrovsky, N. Boiko, V. Shibaev, and J. Wendorff, “Photoinduced textural and optical changes in a cholesteric copolymer with azobenzene-containing side groups,” Liquid Crystals 31, 351–359 (2004).
[Crossref]

Shibaev, V. P.

V. P. Shibaev, A. Bobrovsky, and N. Boiko, “Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties,” Prog. Polym. Sci. 28, 729–836 (2003).
[Crossref]

Shpak, M.T.

I. P. Ilchishin, E. A. Tikhonov, V.G. Tischenko, and M.T. Shpak, “Generation of tunable radiation by impurity cholesteric liquid crystals,” JETP Lett. 32, 27–30 (1981).

Taheri, B.

W. Cao, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Lasing in a three-dimensional photonic crystal of the liquid crystal blue phase II,” Nature Mat. 1, 111 (2002).
[Crossref]

H. Finkelman, S. D. Kim, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Tunable mirrorless lasing in cholesteric liquid crystalline elastomers,” Adv. Mat. 13, 1069–1071 (2001).
[Crossref]

Tikhonov, E. A.

I. P. Ilchishin, E. A. Tikhonov, V.G. Tischenko, and M.T. Shpak, “Generation of tunable radiation by impurity cholesteric liquid crystals,” JETP Lett. 32, 27–30 (1981).

Tischenko, V.G.

I. P. Ilchishin, E. A. Tikhonov, V.G. Tischenko, and M.T. Shpak, “Generation of tunable radiation by impurity cholesteric liquid crystals,” JETP Lett. 32, 27–30 (1981).

Wendorff, J.

A. Bobrovsky, N. Boiko, V. Shibaev, and J. Wendorff, “Photoinduced textural and optical changes in a cholesteric copolymer with azobenzene-containing side groups,” Liquid Crystals 31, 351–359 (2004).
[Crossref]

Yaroshchuk, O.

I.P. Ilchishin, O. Yaroshchuk, S.V. Gryshchenko, and E.A. Shaydiuk, “Influence of the light induced molecular transformations on the helix pitch and lasing spectra of cholesteric liquid crystals,” Proc. SPIE,  5507, 229–234 (2004).
[Crossref]

Yokoyama, S.

S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, “Phototunable photonic bandgap in a chiral liquid crystal laser device,” Appl. Phys. Lett. 84, 2491–2493 (2004).
[Crossref]

Zhang, Z. Q.

V. I. Kopp, Z. Q. Zhang, and A. Z. Genack, “Large coherence area thin film stop-band lasers,” Phys. Rev. Lett. 86, 1753–1756 (2001).
[Crossref] [PubMed]

Adv. Mat. (2)

H. Finkelman, S. D. Kim, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Tunable mirrorless lasing in cholesteric liquid crystalline elastomers,” Adv. Mat. 13, 1069–1071 (2001).
[Crossref]

A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparone, A. Mazzulla, and L. Oriol, “Lasing in dye-doped cholesteric liquid crystals: Two New Tuning Strategies,” Adv. Mat. 16, 791–795 (2004).
[Crossref]

Appl. Phys. Lett. (1)

S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko, “Phototunable photonic bandgap in a chiral liquid crystal laser device,” Appl. Phys. Lett. 84, 2491–2493 (2004).
[Crossref]

Chem. Mat. (1)

P. V. Shibaev, J. Madsen, and A. Z. Genack, “Lasing and narrowing of spontaneous emission from responsive cholesteric films,” Chem. Mat. 16, 1397–1399 (2004).
[Crossref]

J. Phys. Chem. B (1)

P. V. Shibaev, V. Kopp, and A. Z. Genack, “Photonic materials based on mixtures of cholesteric liquid crystals with polymers,” J. Phys. Chem. B 107, 6961–6964 (2003).
[Crossref]

JETP Lett. (2)

I. P. Ilchishin, E. A. Tikhonov, V.G. Tischenko, and M.T. Shpak, “Generation of tunable radiation by impurity cholesteric liquid crystals,” JETP Lett. 32, 27–30 (1981).

A. N. Bogdanov, “Theory of spherulitic domains in cholesteric liquid crystals with positive dielectric anisotropy,” JETP Lett. 71, 85–88, (2000).
[Crossref]

Liquid Crystals (1)

A. Bobrovsky, N. Boiko, V. Shibaev, and J. Wendorff, “Photoinduced textural and optical changes in a cholesteric copolymer with azobenzene-containing side groups,” Liquid Crystals 31, 351–359 (2004).
[Crossref]

Macromolecules (1)

P. V. Shibaev, V. Kopp, A. Z. Genack, and M. Green, “Lasing from a stiff chain polymeric lyotropic liquid crystal,” Macromolecules 35, 3022–3025 (2002).
[Crossref]

Nature Mat. (1)

W. Cao, A. Munoz, P. Palffy-Muhoray, and B. Taheri, “Lasing in a three-dimensional photonic crystal of the liquid crystal blue phase II,” Nature Mat. 1, 111 (2002).
[Crossref]

Optics Express (1)

A. Y. G. Fuh and T. H. Lin, “Lasing in chiral photonic liquid crystals and associated frequency tuning,” Optics Express 12, 1857–1863 (2004).
[Crossref] [PubMed]

Phys. Rev. Lett. (1)

V. I. Kopp, Z. Q. Zhang, and A. Z. Genack, “Large coherence area thin film stop-band lasers,” Phys. Rev. Lett. 86, 1753–1756 (2001).
[Crossref] [PubMed]

Proc. SPIE (1)

I.P. Ilchishin, O. Yaroshchuk, S.V. Gryshchenko, and E.A. Shaydiuk, “Influence of the light induced molecular transformations on the helix pitch and lasing spectra of cholesteric liquid crystals,” Proc. SPIE,  5507, 229–234 (2004).
[Crossref]

Prog. Polym. Sci. (1)

V. P. Shibaev, A. Bobrovsky, and N. Boiko, “Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties,” Prog. Polym. Sci. 28, 729–836 (2003).
[Crossref]

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Figures (4)

Fig. 1.
Fig. 1.

Structure of light sensitive chiral azo dopants and trans-cis isomerization.

Fig. 2.
Fig. 2.

(a) Tuning of lasing wavelength towards shorter wavelengths with increasing time, t, of UV irradiation, (b) Backward shift of lasing wavelengths after turning UV irradiation off and keeping sample in the dark for t minutes. The arrows point to the direction of changes of the lasing peaks with time.

Fig. 3.
Fig. 3.

(a) Change of the position of the selective reflection band under UV irradiation with increasing irradiation time, t, (b) Restoration of the position of the selective reflection band with time after turning UV light off. The arrows point to the direction of changes of the SRB with time.

Fig. 4.
Fig. 4.

Morphology of the sample after low intensity UV irradiation: (a) Immediately after irradiation at 365nm, (b)Restoration of the structure 180 s after irradiation.

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