摘要
The intrinsic optical bistability(OB)of graded core-shell granular composites is investigated.The coated particles are made of cores with gradient dielectric functionεc(r)=A(r/a)^(k)and nonlinear shells.In view of the exponential distribution of the core dielectric constant,the potential functions of each region are obtained by solving the Maxwell equations,and the mathematical expressions of electric field in the shells and cores are determined.Numerical study reveals that the optical bistable threshold and the threshold width of the composite medium are dependent on the shell thickness,core dielectric exponent,and power function coefficient.The optical bistable width increases with the decreasing shell thickness and the power exponent and with the increasing power function coefficient.
作者
吴亚敏
陈国庆
马超群
薛寺中
朱焯炜
WU Ya-Min;CHEN Guo-Qing;MA Chao-Qun;XUE Si-Zhong;ZHU Zhuo-Wei(School of Science,Jiangnan University,Wuxi 214122;State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062)
基金
Supported by the National Natural Science Foundation of China under Grant No 61178032
the Natural Science Foundation of Jiangsu Province under Grant No BK2009066
Jiangsu Science and Technology Support Program under Grant No BE2011828
the Fundamental Research Funds for the Central Universities under Grant No JUSRP31005.