等效介电常数法研究带薄壳金属颗粒复合体系中的光学双稳

应用科学学报 ›› 2007, Vol. 25 ›› Issue (1): 91-95.

等效介电常数法研究带薄壳金属颗粒复合体系中的光学双稳

顾利萍¹, 高雷²

1. 常熟理工学院江苏省新型功能材料重点建设实验室, 江苏常熟 215500;
2. 苏州大学物理系, 江苏苏州 215006

收稿日期:2006-04-26 修回日期:2006-06-16 出版日期:2007-01-31 发布日期:2007-01-31
通信作者: 高雷,教授,博导,研究方向:凝聚态物理,E-mail:leigao@suda.edu.cn E-mail:leigao@suda.edu.cn
基金资助:
国家自然科学基金(10204017);江苏省新型功能材料重点建设实验室开放基金(05KFJJ001);江苏省自然科学基金(BK2002038)资助项目

Equivalent Dielectric Constant Theory for Optical Bistability in Nonlinear Thin Coated Composites

GU Li-ping¹, GAO Lei²

1. Jiangsu Laboratory of Advanced Functional Materials, Changshu 215500, China;
2. Department of Physics, Suzhou University, Suzhou 215006, China

Received:2006-04-26 Revised:2006-06-16 Online:2007-01-31 Published:2007-01-31

摘要/Abstract

摘要：

利用等效介电常数法,将带壳三组分颗粒复合体系等效成两组分颗粒复合体系,从而利用谱表示方法求解带壳层颗粒复合体系的空间局域场对外加电场的依赖.在Maxwell-Garnett近似下,研究了具有无规分布的带壳椭球颗粒非线性复合体系中的光学双稳特性.数值结果表明,光学双稳和双稳阈值强烈依赖颗粒的退极化因子.此外,我们还研究了复合体系的有效介电常数对外场的非线性依赖.

关键词: 等效介电常数, 非线性带薄壳椭球颗粒复合体系, 光学双稳

Abstract:

With the dielectric constant method, the dielectric response for three-phase composite media, in which coated inclusions are randomly embedded in a dielectric host, can be regarded as that of two-phase composites.As a result, we are able to obtain the dependence of the local field on the applied field based on the spectral representation theory.Then, we adopt the Maxwell-Garnett approximation to investigate optical bistability (OB) of three-component composites in which non-spherical coated inclusions are randomly embedded in a dielectric host in the dilute limit.Numerical results show that the OB behavior is strongly dependent on the depolarization factor (L) of the particles.The field-dependent effective dielectric constant of the composites is also studied.

Key words: equivalent dielectric constant, optical bistability, non-linear composites with thin coated spheroidal nanoparticles

中图分类号:

顾利萍, 高雷. 等效介电常数法研究带薄壳金属颗粒复合体系中的光学双稳[J]. 应用科学学报, 2007, 25(1): 91-95.

GU Li-ping, GAO Lei. Equivalent Dielectric Constant Theory for Optical Bistability in Nonlinear Thin Coated Composites[J]. Journal of Applied Sciences, 2007, 25(1): 91-95.