We demonstrate the light transmission characteristics in a photonic crystal (PC) slab with liquid crystal (LC) as an anisotropic medium. In PC slabs, the guided resonance occurs for normal incidence of light. In this study, we first fabricated a SiN PC slab without LC and observed this resonance. Also, we added an ellipticity to holes of the PC slab and observed a polarization filtering effect arising from the structural birefringence. Then, we filled the holes with LC. By making a phase transition in the LC, the resonant wavelength was tuned by maximally 33 nm. This will be applicable to surface-normal-type devices which control the transmission and polarization characteristics of light.© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Naoko Inoue and Toshihiko Baba
"External control of guided resonance in photonic crystal slab by changing the index anisotropy of liquid crystal", Proc. SPIE 6352, Optoelectronic Materials and Devices, 63520R (September 22, 2006); doi:10.1117/12.691209; http://dx.doi.org/10.1117/12.691209