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 Oct;68(4 Pt 2):046602. doi: 10.1103/PhysRevE.68.046602. Epub 2003 Oct 10.
We theoretically demonstrate the coupling of the TE and TM modes of electromagnetic waves in two-dimensional photonic crystals with surface defects of liquid crystals. Due to anisotropies of liquid crystals, the TE and TM modes cannot be classified generally in the surface defects, which causes the coupling of the TE and TM modes. The coupling of the TE and TM modes occurs strongly at frequencies at which group velocities of electromagnetic waves become zero, especially at surface defect modes. Possibility of the sharp tunability and the switching of the transmittance in this system has been demonstrated theoretically by the control of directors of liquid crystals by applied electric field due to their anisotropy.
我们从理论上证明了二维光子晶体中具有液晶表面缺陷时电磁波的TE模和TM模的耦合。由于液晶的各向异性，TE模和TM模在表面缺陷中通常无法进行分类，这导致了TE模和TM模的耦合。TE模和TM模的耦合在电磁波群速度变为零的频率处强烈发生，特别是在表面缺陷模处。由于液晶的各向异性，通过施加电场控制液晶指向矢，从理论上证明了该系统中透射率具有急剧可调性和开关特性的可能性。
