CAJ | 학술논문

基于平面波展开法,理论分析了填充率、介质各向异性的程度对单轴金刚石结构三维光子晶体禁带的影响.结果表明,当填充率和介质各向异性取合适的值,单轴各向异性金刚石结构光子晶体存在着完全带隙.介质各向异性的引入使该晶体的带隙变窄甚至完全关闭.在各个布里渊区域里,带隙率和带隙宽度随介质各向异性程度的变化而变化.各向异性的引入为调整光子禁带提供了一种方法.
기우평면파전개법,이론분석료전충솔、개질각향이성적정도대단축금강석결구삼유광자정체금대적영향.결과표명,당전충솔화개질각향이성취합괄적치,단축각향이성금강석결구광자정체존재착완전대극.개질각향이성적인입사해정체적대극변착심지완전관폐.재각개포리연구역리,대극솔화대극관도수개질각향이성정도적변화이변화.각향이성적인입위조정광자금대제공료일충방법.
With the plane-wave expansion method, the photonic-band-gap structure for a diamond lattice consisting of a uniaxial anisotropic-dielectric sphere in air was studied through tuning three inequivalent 1/3 Brillouin zone. The results show that choosing the suitable range of filling fraction and anisotropy, a full band gap opens in the whole Brillouin zone for this anisotropic PBG structure. The gap to midgap ratio and bandgap width is tunable as a result of the changing extraordinary axis orientation of the uniaxial sphere. Anisotropy in sphere dielectric function is found to narrow or even close band gaps. The band gap width and close rate are affected by the extraordinary axis directions and anisotropy. The results in turn suggest a potential approach to obtain some degree of tunability of the photonic band structures.