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Polarization characteristics of phase retardation defect mode lasing in polymeric cholesteric liquid crystals

机译：聚合物胆甾型液晶中相位延迟缺陷模式激光的偏振特性

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摘要

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.
机译：我们已经研究了由两个聚合物胆甾型液晶（CLC）薄膜作为光子带隙（PBG）材料夹在中间的染料掺杂向列层的激光发射特性。向列层用作缺陷层，其各向异性带来以下显着的光学特性：（1）由于延迟效应，PBG区中的反射率超过50％，这是无法从单个CLC膜中预测到的； （2）在缺陷模式波长或光子带边缘发生有效的激光发射； （3）由缺陷模式和光子带边缘模式引起的激光发射同时包含右旋和左旋圆偏振，而来自带有左旋螺旋的染料掺杂单CLC层的激光发射为左旋。圆极化的。

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