在非线性光学薄膜内以长程表面电磁激元波为泵波实现简并四波混频的理论研究

THEORITICAL STUDY OF DEGENERATE FOUR-WAVE-MIXING IN NONLINEAR OPTICAL THIN FILMS USING LONG-RANGE SURFACE PLASMONS AS PUMP WAVES

本文提出一种以长程表面电磁激元波作为泵波,在非线性介质膜中实现简并四波混频的新方案。我们借助于将介质膜内曲折光线在一个方向上展开,获得系统的一维耦合方程,并得到了方程的解及共轭波转换效率的表达式。估计应用这种方案,采用波长合适、功率为1W量级的连续激光可有效地研究一些有机薄膜的三次非线性光学性质。

We propose a new method to realize degenerate four-wave-mixing in nonlinear optical thin films using long-range surface-plasmons-wave as pumps. The coupled equtions of one dimension and their solutions are obtained by means of extending zig-zag ray in the thin film layer along one direction. Some properties about conversion effeciency of a conjugate wave are discussed. Effeciency (larger than 1) is estimated in some organical thin films using a CW laser with power of 1W and a suitabe wavelength.