Sub-terahertz on-off switch based on a two-dimensional photonic crystal infiltrated by liquid crystals

被引：67
作者：
Ghattan, Z. [1 ,2 ]
Hasek, T. [1 ]
Wilk, R. [1 ]
Shahabadi, M. [2 ]
Koch, M. [1 ]
机构：
[1] Tech Univ Carolo Wilhelmina Braunschweig, Inst Hochfrequenztech, D-38106 Braunschweig, Germany
[2] Univ Tehran, Sch Elect & Comp Engn, Photon Res Lab, Tehran, Iran
来源：
OPTICS COMMUNICATIONS | 2008年 / 281卷 / 18期
关键词：
on-off switch; photonic crystals; nematic liquid crystals; sub-terahertz waves; field-induced rotation;
D O I：
10.1016/j.optcom.2008.05.041
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A sub-terahertz switch is realized by infiltration of a two-dimensional photonic crystal (PC) with the liquid crystal 5CB. On-off switching is based on a shift of the bandgap of the PC by applying an external electric field which rotates the 5CB molecules. We confirm theoretically and experimentally that rotating the optical axis of the 5CB molecules considerably affects the transmission of the electromagnetic waves of TM polarization in the stop band. The effect can be used for on-off switching of the electromagnetic waves in the sub-terahertz range. Experimentally we demonstrate an extinction ratio of 13.3 dB at 91 GHz. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：4623 / 4625
页数：3
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