All-angle self-collimation in two-dimensional rhombic-lattice photonic crystals

被引：26
|
作者：
Wu, Z. H. [1 ]
Xie, K. [1 ]
Yang, H. J. [2 ]
Jiang, P. [1 ]
He, X. J. [1 ]
机构：
[1] Univ Elect Sci & Technol China, Sch Optoelect Informat, Chengdu 610054, Peoples R China
[2] Univ Elect Sci & Technol China, Sch Phys Elect, Chengdu 610054, Peoples R China
来源：
JOURNAL OF OPTICS | 2012年 / 14卷 / 01期
基金：
中国国家自然科学基金;
关键词：
photonic crystal; rhombic lattice; self-collimation; all-angle; WAVE-GUIDE; BEAMS; SPLITTERS; PHYSICS; BENDS; LIGHT;
D O I：
10.1088/2040-8978/14/1/015002
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this work, the self-collimating phenomenon in two-dimensional rhombic-lattice photonic crystals is discussed in detail. The equi-frequency contours of a rhombic-lattice rod-type photonic crystal structure are calculated with the plane wave expansion method for different lattice angles and rod radii. A broad range of flat and open equi-frequency contours is found. A rhombic-lattice photonic crystal made of 301 x 21 silicon rods (n = D 3.5) in air is presented as an illustration to demonstrate the broadband all-angle self-collimation. The bandwidth for all-angle self-collimation is verified to be 17.42% of the central frequency by simulations based on the finite-difference time-domain method. The all-angle self-collimation is found to be polarization-independent and the frequency for simultaneous TM and TE all-angle self-collimation is identified and verified by finite-difference time-domain simulations.
引用
收藏
页数：9
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