Significant photoinduced refractive index change observed in porous silicon Fabry-Perot resonators

摘要

It is shown that a porous silicon Fabry-Perot 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-Perot cavity configuration and carrier accumulation in silicon nanocrystallites. The result leads to further progress of nanocrystalline silicon into functional photonic device applications.