Europhys. Lett.
Volume 69, Number 1, January 2005
Page(s) 68 - 74
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 03 December 2004
Europhys. Lett., 69 (1), pp. 68-74 (2005)
DOI: 10.1209/epl/i2004-10311-6

Return back of the extraordinary beam for oblique incidence in helical liquid crystals with large pitch

E. V. Aksenova1, A. A. Karetnikov1, A. P. Kovshik1, V. P. Romanov1 and A. Yu. Val'kov1, 2

1  Saint Petersburg State University, Department of Physics Ul'yanovskaya, 1, Petrodvoretz, 198504 St. Petersburg, Russia
2  Saint Petersburg Institute for Foreign Economic Relations, Economics and Law Liteiny, 42, Saint Petersburg, 191104, Russia

received 9 June 2004; accepted in final form 2 November 2004
published online 3 December 2004

The light propagation in helical liquid crystals with the pitch much larger than the wavelength of light is under consideration. It is predicted theoretically and observed experimentally that the extraordinary wave returns back if the incidence angle is larger than some critical value. This effect results from the wave guide propagation of light in liquid crystals and is not related with the reflection on the boundary.

42.70.Df - Liquid crystals.
42.25.Lc - Birefringence.
41.85.Ct - Beam shaping, beam splitting.

© EDP Sciences 2005