Light-controlled helical pitch and dynamic gratings

• Autorzy: Boychuk V. N. , Gerus I. I. , Iljin A. G. , Parka J.
• Języki publikacji: EN

Abstrakty

EN

A chiral nematic liquid crystal (LC) with a photo-sensitive chiral agent is employed for a light-controlled modulation of optical activity and used as a model substance for a dynamic diffraction grating recording. The described liquid crystalline system has shown a strong nonlinear response with effective parameter of cubic nonlinearity being much greater of that characteristic of the orientational nonlinearity of LC. A simple mathematical model of light diffraction on the grating of modulated optical activity was developed. Calculated values of intensities and polarisation states of diffracting beams have shown very good agreement with the experimental data. LC systems with light-controlled chirality could be promising media for nonlinear optical applications or all-optical switching devices.

Słowa kluczowe

EN

chiral nematics; optical activity; diffraction grating; photonic bandgap

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2009
• Tom: Vol. 17, No. 4
• Strony: 287--292
• Opis fizyczny: Bibliogr. 18, wykr., il.

Twórcy

autor

Boychuk V. N.

autor

Gerus I. I.

autor

Iljin A. G.

autor

Parka J.

• Institute of Physics, National Academy of Sciences of Ukraine, Prospect Nauki 46, Kiev, 03039, Ukraine,

Bibliografia

• [1] S. R. Kennedy, J. C. Sit, D. J. Broer, and M. J. Brett: Optical activity of chiral thin film and liquid crystal hybrids. Liq. Cryst. 28, 1799-1803, 2001.
• [2] H. Xianyu, S. Faris, and G. P. Crawford: In-plane switching of cholesteric liquid crystals for visible and near-infrared applications. Appl. Optics 43, 5006-5015, 2004.
• [3] B. I. Senyuk, I. I. Smalyukh, and O. D. Lavrentovich: Switchable two-dimensional gratings based on field-induced layer undulations in cholesteric liquid crystals. Opt. Lett. 30, 349-351, 2005.
• [4] H. J. Eichler, D. Grebe, R. Macdonald, A. G. Iljin, G. V. Klimusheva, and L. I. Zagainova: Transient grating optical non-linearities of dye-doped cholesteric liquid crystals. Opt. Mater. 2, 201-208, 1993.
• [5] R. K. Komanduri and M. J. Escuti: Elastic continuum analysis of the liquid crystal polarization grating. Phys. Rev. E76, 021701-8 2007.
• [6] M. Moriyama, S. Song, H. Matsuda, and N. Tamaoki: Effects of doped dialkylazobenzenes on helical pitch of cholesteric liquid crystal with medium molecular weight: utilisation for full colour image recording. J. Mater. Chem. 11, 1003-1010, 2001.
• [7] J. H. Liu, P. Ch. Yang, Yu. K. Wang, and Ch. Ch. Wang: Optical behaviour of cholesteric liquid crystal cells with novel photoisomerizable chiral dopants. Liq. Cryst. 33, 237-248, 2006.
• [8] A. Chanishvili, G. Chilaya, G. Petriashvili, R. Barberi, R. Bartolino, G. Cipparrone, A. Mazzulla, and L. Oriol: Lasing in dye-doped cholesteric liquid crystals: two new tuning strategies. Adv. Mater. 16, 791-795, 2004.
• [9] S. Furumi, S. Yokoyama, A. Otomo, and S. Mashiko: Control of photonic bandgaps in chiral liquid crystals for distributed feedback effect. Thin Solid Films 499, 322-328, 2006.
• [10] A. Iljin, V. Reshetnyak, S. Shelestiuk, and V. Yarmolenko: Surface director sliding in LC cell with light-controlled chirality. Mol. Cryst. Liq. Cryst. 453, 263-274, 2006.
• [11] M. Z. Alam, T. Yoshioka, T. Ogata, T. Nonaka, and S. Kurihara: Influence of helical twisting power on the photo-switching behaviour of chiral azobenzene compounds: Applications to high-performance switching devices. Chemistry 13, 2641-2647, 2007.
• [12] J. A. Reyes and A. Lakhtakia: Electrically controlled optical bandgap in a structurally chiral material. Opt. Commun. 259, 164-173, 2006.
• [13] P. G. de Gennes and J. Prost, The Physics of Liquid Crystals, Oxford University Press, New York, 1993.
• [14] D. Andrienko, A. Dyadyusha, A. Iljin, Yu. Kurioz, and Yu. Reznikov: Measurements of azimuthal anchoring energy of nematic liquid crystal on a photoaligning polymer surface. Mol. Cryst. Liq. Cryst. 321, 271-281, 1998.
• [15] H. de Vries: Rotatory power and other optical properties of certain liquid crystals. Acta Crystallogr. 4, 219-226, 1951.
• [16] J. Goodman, Introduction to Fourier Optics, McGraw-Hill, New York, 2000.
• [17] M. Born and E. Wolf, Principles of Optics, Pergamon Press, London, 1968.
• [18] B. Ya. Zel'dovich and N. V. Tabiryan: Orientational optical nonlinearity of liquid crystals. Sov. Phys. Uspekhi 28, 1059-1083, 1985.