| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Optical Bistability in Graded Core-Shell Granular Composites |
| WU Ya-Min1**, CHEN Guo-Qing1, MA Chao-Qun2, XUE Si-Zhong1, ZHU Zhuo-Wei1 |
1School of Science, Jiangnan University, Wuxi 214122
2State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062
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| Cite this article: |
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ZHU Zhuo-Wei, XUE Si-Zhong, WU Ya-Min et al 2012 Chin. Phys. Lett. 29 037802 |
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Abstract The intrinsic optical bistability (OB) of graded core-shell granular composites is investigated. The coated particles are made of cores with gradient dielectric function εc(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.
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| Keywords:
78.20.Bh
42.65.Pc
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Received: 02 December 2011
Published: 11 March 2012
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| PACS: |
78.20.Bh
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(Theory, models, and numerical simulation)
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42.65.Pc
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(Optical bistability, multistability, and switching, including local field effects)
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