C-shaped nanoaperture-enhanced germanium photodetector

Abstract

We present a C-shaped nanoaperture-enhanced Ge photodetector that shows 2–5 times the photocurrent enhancement over that from a square aperture of the same area at $1310\mathrm{nm}$ wavelength. We demonstrate the polarization dependence of the C-aperture photodetector over a wide wavelength range. Our experimental observation agrees well with finite-difference time-domain simulation results.