Abstract

We theoretically investigate the bistable spontaneous emission behavior of a single emitter in the vicinity of a hybrid ${{\rm{VO}}_2}$–Au nanoshell. The hybrid nanoshell is illuminated by a continuous wave pump laser. The incident beam generates heat through light absorption and causes the ${{\rm{VO}}_2}$ to undergo a phase change from semiconductor to metallic mode. Our calculation shows that for certain values, over a range of incident laser intensity [$0.25({{\rm{GW}}/{{\rm{m}}^2}}) \lt $ $I$ ${\lt}0.84$ (${\rm{GW}}/{{\rm{m}}^2}$)], at the resonance wavelength of the ${{\rm VO}_2}$ (semiconductor)–Au nanoshell ($\lambda = 630\;{\rm nm}$), there is a reasonable bistable contrast for the two spontaneous emission rate values: the radiative and nonradiative decay rates. Our results provide important general guidelines for enabling platforms for optical switching sources and tunable sensors.

© 2021 Optical Society of America

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