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