a After passing through the single-mode fiber and grating coupler, the probe light is coupled into the silicon microdisk via evanescent coupling from the Si waveguide. b When a 420 nm nanosecond laser is focused onto the top surface of the microdisk, local refractive index changes (∆n1 and ∆n2 resulted from FCA and thermal effect, respectively) induce the shifting of the resonance frequencies. For a fixed probe wavelength, the shifts of resonances lead to two opposite changes of transmittance ∆T1(x, y) and ∆T2(x, y) that can be measured at the output port
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