Vetrov Stepan Ya, Pyatnov Maxim V, Timofeev Ivan V
L.V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia and Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russia.
L.V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia and Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russia and Krasnoyarsk State Medical University named after Professor V.F. Voyno-Yasenetsky, Krasnoyarsk 660022, Russia.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Sep;90(3):032505. doi: 10.1103/PhysRevE.90.032505. Epub 2014 Sep 24.
We have studied spectral properties of a cholesteric liquid crystal with a combined defect consisting of a nanocomposite layer and a twist. The nanocomposite layer is made of metallic nanoballs dispersed in a transparent matrix and featuring effective resonant permittivity. A solution has been found for the transmission spectrum of circularly polarized waves in the structure. We have analyzed spectral splitting of the defect mode in the band gap of the cholesteric when its frequency coincides with the nanocomposite resonant frequency. Defect modes have characteristics strongly dependent on the magnitude and the sign of the phase difference of the cholesteric helix on both sides of the defect layer. It has been found that the band gap width and the position and localization degree of defect modes can be effectively controlled by external fields applied to the cholesteric.
我们研究了一种胆甾相液晶的光谱特性，该液晶具有由纳米复合层和扭曲组成的复合缺陷。纳米复合层由分散在透明基质中且具有有效共振介电常数的金属纳米球制成。已找到该结构中圆偏振波透射光谱的解决方案。我们分析了胆甾相带隙中缺陷模式的光谱分裂，此时其频率与纳米复合共振频率一致。缺陷模式的特性强烈依赖于缺陷层两侧胆甾相螺旋相位差的大小和符号。已发现，通过施加于胆甾相的外部场，可以有效地控制带隙宽度、缺陷模式的位置和局域化程度。
