In this paper we theoretically investigate the nonlinear behaviour of a rectangular liquid crystal waveguide. An optical beam of a C-Band laser, fiber coupled to the waveguide, modulates the refractive index of the liquid crystal core. Light propagation is obtained when the effective refractive index of the core exceed the cladding refractive index one. The cut-off condition can be determined by the initial alignment of the liquid crystal molecules and by the laser beam itself that excites optical nonlinearity due to optically induced reorientational effect. Low power optical control could be obtained with an optimization of the molecular alignment.
All Optical Tunable Nematic Liquid Crystal Waveguide / M., Trotta; Asquini, Rita; D'Alessandro, Antonio; R., Beccherelli. - In: MOLECULAR CRYSTALS AND LIQUID CRYSTALS. - ISSN 1542-1406. - STAMPA. - 558:1(2012), pp. 204-208. [10.1080/15421406.2011.654189]
All Optical Tunable Nematic Liquid Crystal Waveguide
ASQUINI, Rita;D'ALESSANDRO, Antonio;
2012
Abstract
In this paper we theoretically investigate the nonlinear behaviour of a rectangular liquid crystal waveguide. An optical beam of a C-Band laser, fiber coupled to the waveguide, modulates the refractive index of the liquid crystal core. Light propagation is obtained when the effective refractive index of the core exceed the cladding refractive index one. The cut-off condition can be determined by the initial alignment of the liquid crystal molecules and by the laser beam itself that excites optical nonlinearity due to optically induced reorientational effect. Low power optical control could be obtained with an optimization of the molecular alignment.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.