Photonic Density of States of a Stack of Cholesteric Liquid Crystal and Isotropic Medium Layers

RREPS13; Meghri13

Gevorgyan, A.H.^1,2 ; Harutyunyan, M.Z.^2 ; Matinyan, G.K.^3 ; Mkhitaryan, S.A.^2

Institute of Applied Problems of NAS, RA, 25 Hr. Nersisyan St, Yerevan, Armenia^1

Yerevan State University, 1 Al. Manookian St., Yerevan, 025, Armenia^2

Armenian National Agrarian University, Terian St. 74, Yerevan, 009, Armenia^3

关键词: Eigenpolarizations;    Emittances;    Isotropic medium;    Low-threshold lasers;    Parameters characterizing;    Photonic density of state;    Reflection spectra;    Wavelength tunable;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/517/1/012034/pdf
DOI  :  10.1088/1742-6596/517/1/012034

来源: IOP

【 摘 要 】

We calculated the photonic density of states (PDS) of the eigen polarizations in the system composed of a stack of layers of a cholesteric liquid crystal and an isotropic medium. The reflection spectra and PDS peculiarities, as well as the peculiarities of absorption and emittance were investigated. We obtained the dependences of the PDS as a function of parameters characterizing absorption and gain. It was shown that the subject system can be used in lasers for obtaining low threshold lasers with the emittance wavelength tunable in wide ranges. The system also can work as a multi-position trigger.