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首页> 外文期刊>Advanced Materials >Effect of Phase Retardation on Defect Mode Lasing in Polymeric Cholesteric Liquid Crystals
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Effect of Phase Retardation on Defect Mode Lasing in Polymeric Cholesteric Liquid Crystals

机译：相位延迟对高分子胆甾型液晶中缺陷模激光的影响

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摘要

Crystals possessing a periodic modulation of their dielectric I function are called photonic crystals (PCs), and inhibit certain frequencies of electromagnetic radiation from propagating through specific crystal orientations, (i.e., have a photonic bandgap (PBG)). PCs are widely viewed as promising materials for optical signal processing due to the fact that the flux of the light can be readily manipulated by these materials. Cholesteric liquid crystals (CLCs) are particularly interesting one-dimensional PC materials because of their spontaneous self-assembly into periodic structures and the fact that the PBG can be tuned over a broad range of frequencies. These materials make promising photonic devices possible, making use of lasing at the PBG edge, and examples have been reported in low-molecular-weight CLCs, in polymeric cho-lesteric liquid crystals (PCLCs), in chiral smectic LCs, and in a blue phase. Lasing due to physical imperfections introduced into periodic CLCs, i.e., defect modes, has also been reported. In the study reported here, we constructed a sophisticated system comprising a polymer-dye-doped nematic defect layer sandwiched between PCLC films and succeeded in introducing the new effect of a retardation defect mode, resulting in modulation of reflectance over 50 % and efficient lasing.
机译：具有其介电I功能的周期性调制的晶体称为光子晶体（PCs），它会抑制某些特定频率的电磁辐射通过特定的晶体取向传播（即具有光子带隙（PBG））。由于光通量可以很容易地被这些材料操纵，因此PC被广泛认为是用于光信号处理的有前途的材料。胆甾型液晶（CLC）特别令人感兴趣，是一维PC材料，因为它们自发地自组装成周期性结构，并且PBG可以在很宽的频率范围内调谐。这些材料利用PBG边缘的激光使有前途的光子器件成为可能，并且在低分子量CLC，聚合物胆甾型液晶（PCLC），手性近晶LC和蓝色中报道了一些例子。相。还报道了由于周期性CLC中引入的物理缺陷引起的缺陷，即缺陷模式。在这里报道的研究中，我们构建了一个复杂的系统，该系统包括夹在PCLC膜之间的掺有聚合物染料的向列缺陷层，并成功引入了延迟缺陷模式的新效果，从而导致反射率调制超过50％，并且有效发射激光。

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