Magnetically tunable silicon-ferrite photonic crystals for terahertz circulator

被引：64

作者：

Fan, Fei ^{[1
]}

Chang, Sheng-Jiang ^{[1
]}

Niu, Chao ^{[1
]}

Hou, Yu ^{[1
]}

Wang, Xiang-Hui ^{[1
]}

机构：

[1] Nankai Univ, Key Lab Optoelect Informat Sci & Technol, Inst Modern Opt, Minist Educ, Tianjin 300071, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2012年 / 285卷 / 18期

基金：

国家高技术研究发展计划(863计划); 中国国家自然科学基金; 国家教育部博士点专项基金资助;

关键词：

Terahertz; Photonic crystals; Circulator; Magneto-optical material;

D O I：

10.1016/j.optcom.2012.05.044

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The gyromagnetic properties of ferrite materials and the nonreciprocal property of a silicon-ferrite photonic crystal cavity are investigated in the terahertz region. Through the structure optimization and analysis of defect mode coupling, we design a magnetically tunable circulator, of which central operating frequency can be tuned from 180 to 205 GHz and the maximum isolation is 65.2 dB. Moreover, the further study shows that the gyrotropy, dispersion, and ferromagnetic loss of ferrite materials under the different external magnetic fields greatly affect the transmission and isolation property of this device. This circulator is flexible to realize functions of controllable splitting, routing, filtering and isolation by changing the external magnetic field for the THz applications. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：3763 / 3769

页数：7

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