Lasing characteristics of a dye-doped nematic liquid crystal layer sandwiched by two polymeric cholesteric liquid crystals
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- Lasing characteristics of a dye-doped nematic liquid crystal layer sandwiched by two polymeric cholesteric liquid crystals
- Song, Myoung Hoon; Park, B; Shin, KC; Ohta, T; Tsunoda, Y; Hoshi, H; Takanishi, Y; Ishikawa, K; Watanabe, J; Nishimura, S; Toyooka, T; Zhu, ZG; Swager, TM; Takezoe, H
- photonic band gap; polymer cholesteric liquid crystal; defect mode; lasing; phase retardation; polarization; photopolymerization; tunable lasing
- Issue Date
- Proceedings of SPIE - The International Society for Optical Engineering, v.5518, no., pp.66 - 76
- We have studied the lasing characteristics from a dye-doped nematic layer sandwiched by two polymeric cholesteric liquid crystal (PCLC) films as photonic band gap materials. The nematic layer possessing birefringence brings about the following remarkable optical characteristics; (1) reflectance in the photonic band gap (PBG) region exceeds 50 % due to the retardation effect, being unpredictable from a single CLC film, (2) efficient lasing occurs either at the notch of PBG or at the photonic band edge, (3) the lasing emissions contain both right- and left-circular polarizations, and (4) tunable lasing can be achieved by the reorientation of nematic liquid crystal molecules under the application of an electric field.
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