Tunable reducibility of Brillouin zone and bandgap width in elliptical nanowire arrays  

作　　者：Zongyi Zhang Yonggang Wu Zihuan Xia Jian Zhou Xuefei Qin 张棕奕;吴永刚;夏子奂;周建;秦雪飞(MOE Key Laboratory of Advanced Micro-Structured Materials,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China;Institute of Precision Optical Engineering,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China;School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China)

机构地区：[1]MOE Key Laboratory of Advanced Micro-Structured Materials,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China [2]Institute of Precision Optical Engineering,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China [3]School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China

出　　处：《Chinese Optics Letters》2020年第6期75-80,共6页中国光学快报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(No.61875153).

摘　　要：Rotating elliptical nanowire arrays as two-dimensional photonic crystals has been proposed and studied in this Letter.The analysis of the four lowest energy bands and the first bandgap width of some examples illustrates that the rotation and configuration of the primitive cell can have effects on the reducibility of the Brillouin zone.As the central element’s orientation changes,the irreducible Brillouin zone could be expanded to the whole first Brillouin zone.Special attention has been paid to the nanowire arrays with adjacent elements perpendicular to each other,and the irreducible Brillouin zone unexpectedly retracted back to the 1/8 of the first Brillouin zone though the symmetry of elements is lower than that of the square lattice.Meanwhile,the first bandgap width of the perpendicular array can be adjusted by the rotation of each primitive element.

关 键 词：Brillouin zone bandgap SYMMETRY perpendicular elliptical nanowires rotation 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O734[理学—晶体学]