Journal
OPTICS EXPRESS
Volume 24, Issue 19, Pages 22272-22281Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.022272
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Funding
- National Natural Science Foundation of China (NSFC) [11374223]
- National Basic Research Program [2012CB921501]
- Qing Lan Project
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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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
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