Significant photoinduced refractive index change observed in porous silicon Fabry–Pérot resonators

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Abstract
It is shown that a porous silicon Fabry–Pérot resonator device exhibits a significant nonlinear optical transmission behavior at wavelengths in the near-infrared region. The input–output (transmission–incident power) response curve shows superlinear or sublinear behavior dependent on excitation wavelengths around the resonant position. These characteristics are interpreted as a result of nonlinear refractive index change, including by enhanced optical power in the Fabry–Pérot cavity configuration and carrier accumulation in silicon nanocrystallites. The result leads to further progress of nanocrystalline silicon into functional photonic device applications.