Thermo-optic hysteresis with bound states in the continuum

DOI: https://doi.org/10.1103/PhysRevA.106.063507

We consider thermo-optic hysteresis in a silicon structure supporting bound states in the continuum. Taking into account radiative heat transfer as a major cooling mechanism we constructed a nonlinear model describing the optical response. It is shown that the thermo-optic hysteresis can be obtained with low intensities of incident light $I_0\approx 1W/m^2$ at the red edge of the visible under the critical coupling condition.