Molecular Crystals and Liquid Crystals, Vol.545, 1291-1300, 2011
Light Propagation in Liquid Crystal Infiltrated Two-Dimensional Photonic Crystal at a High-Order Photonic Band
Light propagation into a photonic crystal infiltrated with a nematic liquid crystal is numerically investigated. At a high-order photonic band, photonic crystals generally exhibit interesting characteristics such as a negative refraction and a superprism effect. Our numerical results show that the sign of an effective refractive index of the tunable photonic crystal can be controlled at a certain frequency by changing molecular orientation. Furthermore, using a combination of positive and negative index photonic crystals, a light could be redirected 90 degrees without a waveguide structure.