摘要
【目的】研究一维光子晶体表面模的特性,探究使用衰减全反射(ATR)技术激发光子晶体表面模的可行性。【方法】采用超元胞法和迭代菲涅尔方程计算一维光子晶体表面模的色散曲线及其ATR反射谱(利用棱镜装置)。【结果】当一维光子晶体最外层是高折射率层时,改变其厚度可以灵活控制表面模,相同带隙内不同位置的表面模其电场局域性不同;能带图中同一带隙内远离真空光线且居于带隙中部的表面模其电场局域性更强。【结论】利用棱镜装置能激发一维光子晶体的表面波;通过反射谱的形状和极小值点的位置可以判断透射介质的光学性质。
【Objective】The properties of one-dimensional photonic crystal surface modes are studied and the possibility of exciting surface modes is discussed by attenuated total reflection(ATR)technique.【Methods】The supercell method and iterative Fresnel equation are applied to calculate dispersion curves of surface mode and ATR reflection spectrum.【Results】We found that surface modes could be flexibly controlled by changing the thickness of outmost layer of one-dimensional photonic crystals when the layer's refractive index is higher and the difference of localization of electric filed between different positions are obvious in the same gap.The surface modes,which are far from the light line of vacuum and localize at the midgap,will strongly confined on the PC side and in the air side.【Conclusion】The surface modes of one-dimensional photonic crystals can be excited by Kreschmann configuration and the optical properties of tansmission medium can be predicted by the shape and position of minimum peak.
出处
《广西科学》
CAS
2015年第1期104-108,共5页
Guangxi Sciences
基金
国家自然科学基金项目(51161003
50661001
50061001)
广西自然科学重点基金项目(2012GXNSFDA053001)
广西大学广西有色金属及特色材料加工重点实验室开放基金项目(GXKFJ12-01)资助
关键词
一维光子晶体
表面模
超元胞法
衰减全反射
one-dimensional photonic crystals,surface mode,supercell method,ATR
