Optical bistability in core-shell magnetoplasmonic nanoparticles with magnetocontrollability

被引:9
作者
Yu, W. J. [1 ]
Sun, H. [1 ]
Gao, L. [1 ,2 ]
机构
[1] Soochow Univ, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China
[2] Soochow Univ, Jiangsu Key Lab Thin Films, Suzhou 215006, Peoples R China
来源
OPTICS EXPRESS | 2016年 / 24卷 / 19期
基金
中国国家自然科学基金;
关键词
COMPOSITE MEDIA; SCATTERING; LIGHT;
D O I
10.1364/OE.24.022272
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We propose a mechanism to actively tune optical bistable behavior with the external magnetic field in nonlinear coated nanospheres with a magneto-optical (MO) shell and nonlinear metallic core. We show that such nanostructures can exhibit typical bistable phenomena near surface plasmon resonant wavelengths, which can be modified through the external magnetic fields B. We demonstrate numerically that the optical bistability exists only when the volume fraction eta of the metallic core is larger than a critical one eta(c). Moreover, the bistable behavior is found to be dependent on the incident polarization state as well as the external magnetic field. The application of an external magnetic field does not only increase (or decrease) the upper/lower threshold fields but also changes the critical volume fractions. Such nanostructures with magneto-controllable optical bistability may be designed for us as nonlinear optical nanodevices, such as optical nanoswitches, nanosensors and so on. (C) 2016 Optical Society of America
引用
收藏
页码:22272 / 22281
页数:10
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