Optical Bistability in Nanosilicon with Record Low Q-Factor.
Nano Lett
; 23(24): 11727-11733, 2023 Dec 27.
Article
em En
| MEDLINE
| ID: mdl-38014963
We demonstrated optical bistability in an amorphous silicon Mie resonator with a size of â¼100 nm and Q-factor as low as â¼4 by utilizing photothermal and thermo-optical effects. We not only experimentally confirmed the steep intensity transition and the hysteresis in the scattering response from silicon nanocuboids but also established a physical model to numerically explain the underlying mechanism based on temperature-dependent competition between photothermal heating and heat dissipation. The transition between the bistable states offered particularly steep superlinearity of scattering intensity, reaching an effective nonlinearity order of â¼100th power over excitation intensity, leading to the potential of advanced optical switching devices and super-resolution microscopy.
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2023
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Article