Takeda Hiroyuki, Yoshino Katsumi
Department of Electronic Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2003 May;67(5 Pt 2):056607. doi: 10.1103/PhysRevE.67.056607. Epub 2003 May 9.
Tunable refraction effects in two-dimensional photonic crystals utilizing liquid crystals are theoretically demonstrated. Due to liquid crystals with anisotropies, the incident light propagates in photonic crystals at refractive angles different from those in photonic crystals composed of isotropic materials. Moreover, refractive angles can be changed by rotating the directors of liquid crystals. Tunable refraction effects are also discussed for the light with two kinds of frequencies: one is a frequency at the edge of a band gap, and the other is a frequency a little far from the edge of a band gap.
理论上证明了利用液晶的二维光子晶体中的可调折射效应。由于液晶具有各向异性，入射光在光子晶体中的传播折射角与由各向同性材料组成的光子晶体中的折射角不同。此外，通过旋转液晶的指向矢可以改变折射角。还讨论了两种频率光的可调折射效应：一种是带隙边缘的频率，另一种是离带隙边缘稍远的频率。
