Photonic properties of heliconical liquid crystals
Photonic properties of heliconical liquid crystals
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DOI：
10.1364/oe.26.023265
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发表时间：
2018-09-03
期刊：
影响因子：
3.8
通讯作者：
Ravnik, Miha
中科院分区：
文献类型：
--
作者：
Bregar, Anja;Stimulak, Mitja;Ravnik, Miha
周期性双折射是当今广泛探索的一种有趣的控制光的流动的途径。不同的是，具有双折射周期性调制的复杂流体可以表现为光子晶体，主要的例子是蓝相和蓝相双折射分布。在这里，我们展示了光在螺旋液晶中的传播特性，并展示了它们的可调光学和光子学特性，特别是作为一维光子晶体，在螺旋螺距与光波长相当的情况下。使用频域和时域相结合的模拟，我们显示的光子带隙的存在和属性，确定的光的偏振和螺旋结构的相对手。我们计算光子本征模的光，并找到出现的电场分量沿沿着光的传播轴，无论是左手和右手偏振的光，这反过来又导致在强烈的空间变化的坡印亭矢量，表现出圆形和旅游叶三叶草样的图案。由于坡印廷矢量的这种变化是可调的各种材料参数和外部（电）场，螺旋双折射光子晶体显示出有趣的潜力，用于可调的光子应用，如复杂的调制光束。(C)根据OSA开放获取出版协议的条款，2018年美国光学学会
Periodic birefringence is today extensively explored as an interesting route for controlling the flow of light. Distinctly, complex fluids with periodic modulations of birefringence can perform as photonic crystals, with the main examples being cholesteric and blue phases birefringent profiles. Here we demonstrate the characteristics of light propagation in heliconical liquid crystal and demonstrate their tunable optical and photonic properties, specifically as one-dimensional photonic crystals, in the regime of heliconical pitch comparable to the wavelength of light. Using a combination of frequency- and time-domain simulations, we show the existence and properties of the photonic band gap, as determined by the relative handedness of the polarization of light and the heliconical structure. We calculate photonic eigenmodes of the light and find the emergence of electric field component along the propagation axis of light, for both left- and right-handed polarization of light, which in turn results in strongly spatially varying Poynting vector that exhibits circular-like and tour-leaf-clover-like patterns. As this variation of the Poynting vector is tunable with various material parameters and external (electric) fields, heliconical birefringence photonic crystals show interesting potential for use in tunable photonic applications, such as complex modulation of light beams. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement