摘要
研究含有损耗的双负介质导波层的棱镜波导耦合系统中的古斯汉森(Goos-H?nchen,GH)位移增强效应。采用稳态相位理论得出了GH位移的表达式,并推导出获得较大GH位移的充分条件;通过仿真分析,研究了介电常数、包层和导波层的厚度对GH位移的影响,同时验证了增强GH位移的充分条件的有效性。结果表明,利用双负介质做棱镜波导系统的导波层可以有效克服材料自身带来的损耗,实现较大值的GH位移;同时,系统中的GH位移极大值对包层和导波层的厚度的微弱变化(1纳米)十分敏感,可用来制作高灵敏度的表面平整度探测器。
We study the enhancement of Goos-H?nchen (GH) lateral shift in a prism-waveguide coupling system with a guiding layer of lossy double-negative (DNG) material. The expression of GH shift in our system is deduced by stationary-state method and the sufficient conditions for the realization of large positive or negative GH shift are derived and verified by simulation results. Simu-lation results also show the influence of permittivity and thicknesses of cladding and guiding layers on GH shift, and the peak values of GH shift is rather sensitive to the change of cladding layer or guiding layer (about 1 nanometer) which can be used to realize sur-face irregularity detector.
出处
《激光杂志》
CAS
CSCD
北大核心
2014年第2期32-33,共2页
Laser Journal
基金
四川省教育厅重点项目(14ZA0054)
关键词
波导光学
双负介质
棱镜波导
古斯汉森位移
稳态相位理论
guided wave optics
double-negative material
prism-waveguide
Goos-Hanchen lateral shift
stationary-state method