Gevorgyan A H
Yerevan State University, 1, Al. Manookian Str., 025, Yerevan, Armenia and Institute of Applied Problems of Physics NAS, RA, 25, Hr. Nersisyan Str., 014, Yerevan, Armenia.
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Dec;92(6):062501. doi: 10.1103/PhysRevE.92.062501. Epub 2015 Dec 1.
Resonance properties of a stack consisting of a cholesteric liquid crystal and isotropic medium layers are investigated. Bragg's conditions for photonic band gaps are presented for the considered system. It is shown that a significant control of the system zone structure is possible in the case of a proper selection of the sublayer parameters. It is also shown that an effect of complete suppression of absorption is not usually observed in the case of anisotropic absorption in cholesteric liquid crystal sublayers. The possibility to achieve this effect in the considered system, imposing certain conditions on the thickness and the refraction index of the isotropic medium sublayers, is shown. Also, it is shown that in such conditions a large increase of the maximum of photonic density of states happens at the appropriate zone borders.
研究了由胆甾相液晶和各向同性介质层组成的堆叠结构的共振特性。给出了所考虑系统的光子带隙的布拉格条件。结果表明，在适当选择子层参数的情况下，对系统能带结构进行有效控制是可能的。还表明，在胆甾相液晶子层存在各向异性吸收的情况下，通常不会观察到完全抑制吸收的效果。研究表明，在所考虑的系统中，通过对各向同性介质子层的厚度和折射率施加一定条件，可以实现这种效果。此外，研究还表明，在这种条件下，光子态密度最大值在适当的能带边界处会大幅增加。
