1. Polarization characteristics of phase retardation defect mode lasing in polymeric cholesteric liquid crystals
- Author
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Song, Myoung Hoon, Shin, Ki-Chul, Park, Byoungchoo, Takanishi, Yoichi, Ishikawa, Ken, Watanabe, Junji, Nishimura, Suzushi, Toyooka, Takehiro, Zhu, Zhengguo, Swager, Timothy M., and Takezoe, Hideo
- Subjects
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PHOTONICS , *OPTICAL polarization , *THEORY of wave motion , *ANISOTROPY , *PHYSICAL & theoretical chemistry - Abstract
We have studied the lasing characteristics of a dye-doped nematic layer sandwiched by two polymeric cholesteric liquid crystal (CLC) films as photonic band gap (PBG) materials. The nematic layer acts as a defect layer, the anisotropy of which brings about the following remarkable optical characteristics: (1) reflectance in the PBG region exceeds 50% due to the retardation effect, being unpredictable from a single CLC film; (2) efficient lasing occurs either at the defect mode wavelength or at the photonic band edge; and (3) the lasing emission due to both the defect mode and the photonic band edge mode contains both right- and left-circular polarizations, while the lasing emission from a dye-doped single CLC layer with a left-handed helix is left-circularly polarized. [Copyright &y& Elsevier]
- Published
- 2004
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