Cone-Shaped Emissions in Cholesteric Liquid Crystal Lasers: The Role of Anomalous Scattering in Photonic Structures,ACS Photonics

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Cone-Shaped Emissions in Cholesteric Liquid Crystal Lasers: The Role of Anomalous Scattering in Photonic Structures
ACS Photonics ( IF 6.5 ) Pub Date : 2018-10-16 00:00:00 , DOI: 10.1021/acsphotonics.8b01011
César L. Folcia ₁ , Josu Ortega ₂ , Jesús Etxebarria ₁

Affiliation

The out-of-normal emission in cholesteric liquid-crystal lasers is studied experimental and theoretically. Apart from the well-known dominant laser in the direction of the helix axis, three other types of radiation, with cone-shaped spatial patterns, are identified and characterized. The physical mechanisms responsible for the different emissions are clarified. One of the radiations is a weak colorful lasing emission whose wavelength changes continuously depending on the propagation direction. The wavelengths of the other two radiations take place at the long-wavelength and short-wavelength edges of the photonic bandgap. These emissions are attributed to an anomalous scattering phenomenon that gives rise to energy transfer from the main laser beam to some specific directions where the amount of final photonic states is high. An expression for the scattering cross section, reminiscent of Fermi’s golden rule for spontaneous emission in photonic structures, is proposed. Some other phenomena independent of the lasing occurrence but driven by the anomalous scattering are briefly presented.

中文翻译：

胆甾型液晶激光器中的圆锥形发射：异常散射在光子结构中的作用

对胆甾型液晶激光器的非正常发射进行了实验和理论研究。除了沿螺旋轴方向的众所周知的主导激光外，还可以识别和表征三种其他类型的辐射，这些辐射具有圆锥形的空间图案。阐明了造成不同排放的物理机制。辐射之一是微弱的彩色激光发射，其波长根据传播方向连续变化。其他两个辐射的波长发生在光子带隙的长波和短波边缘。这些发射归因于异常散射现象，该异常散射现象导致能量从主激光束传递到最终光子状态量很高的某些特定方向。提出了散射截面的表达式，让人联想到费米关于光子结构中自发发射的黄金法则。简要介绍了与激射事件无关但受异常散射驱动的其他一些现象。

更新日期：2018-10-16

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