含有损耗双负介质的棱镜波导中古斯汉森位移特性研究

Goos-Hanchen shift in a prism-waveguide with lossy double-negative material

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.