摘要
We report a CMOS-compatible silicon microring-enhanced avalanche photodiode based on linear defect-state absorption in a p^(+)pn^(+) junction,with high responsivities exceeding 1 A/W at telecommunication wavelengths.The large photogenerated currents give rise to giant thermo-optic nonlinearity in the microring resonator,resulting in a linear photocurrent-wavelength response spanning the full free spectral range of the microring.This unique photocurrent spectrum could enable novel applications in wavelength-resolved photodetection,such as compact on-chip spectrometers,linear chirp frequency laser source characterization,and low-cost refractometric sensors without requiring precise wavelength-tunable lasers.
基金
Natural Sciences and Engineering Research Council of Canada。
