Finite-Difference Time-Domain Analysis of Twist-Defect-Mode Lasing Dynamics in Cholesteric Photonic Liquid Crystal

被引：4
|
作者：
Matsui, Tatsunosuke [1 ,2 ]
Kitaguchi, Masahiro [1 ]
机构：
[1] Mie Univ, Grad Sch Engn, Dept Elect & Elect Engn, Tsu, Mie 5148507, Japan
[2] Mie Univ, Ctr Ultimate Technol Nanoelect, Tsu, Mie 5148507, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2012年 / 51卷 / 04期
关键词：
LASERS; MEDIA;
D O I：
10.1143/JJAP.51.04DK02
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have numerically investigated lasing dynamics from a twist defect in a cholesteric liquid crystal (CLC) by an auxiliary differential equation finite-difference time-domain (ADE-FDTD) method. As ADEs, the equation of motion of polarization described on the basis of the classical electron oscillator (Lorenz) model and the rate equation in a four-level energy structure are incorporated. A lower lasing threshold has been obtained from the twist-defect mode (TDM) than from band-edge lasing. Standing-wave-like electric fields are strongly localized only in the vicinity where a twist defect is introduced into a CLC, which works as a distributed feedback TDM laser source. The oscillation direction of a standing-wave electric field is not parallel or perpendicular to LC molecules, which is quite different from the bulk CLC case. Our results may be useful for creating more efficient TDM-based CLC lasers. (C) 2012 The Japan Society of Applied Physics
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页数：6
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