Effect of Thick Anisotropic NLC Layer on Lasing in Polymeric Cholesteric Liquid Crystals
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- Effect of Thick Anisotropic NLC Layer on Lasing in Polymeric Cholesteric Liquid Crystals
- Song, Myoung Hoon; Zhu, Zhengguo; Ihikawa, Ken; Takezoe, Hideo; Park, Byoungchoo; Watanabe, Junji; hin, Ki-Chul; Nihimura, uzuhi; Toyooka, Takehiro; wager, Timothy M.; Takanihi, Yoichi
- Photonic band gap; Polymer cholesteric liquid crystal; Defect mode; Lasing; Phase retardation; Polarization; Nematic liquid crystal
- Issue Date
- KOREAN PHYSICAL SOC
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.46, no.2, pp.265 - 268
- We have studied the lasing characteristics from a dye-doped nematic liquid crystal layer sandwiched by two polymeric cholesteric liquid crystal 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 at the notch of PBG; (3) the lasing emissions contain both right- and left-circular polarizations. In this study, we demonstrate that a 100-μm-thick nematic liquid crystal layer system shows several dips, resulting in multi-mode lasing actions just at the dips within PBG.
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