LAUSR

Active optical antennas, a novel Schottky photodiode design, have drawn significant attention due to their advantages of near‐field enhancement and hot‐electrons generation for sub‐bandgap photodetection. However, the reported active antenna‐based Si Schottky photodetectors have shown low photoresponse in a limited wavelength range below 1650 nm. This work reports hybrid nanoantenna (NA)‐nanopillar (NP) Si Schottky photodetectors for ultrawide and wavelength‐tunable photodetection at room temperature, without using any optical filters. The designed hybrid nanostructure significantly enhances the electric dipole‐induced resonance in the NAs, leading to strong and wavelength‐tunable light absorption in a wide spectral range from 1200 to 2200 nm. Moreover, due to the strong plasmon resonance and 3D cavity effect in the hybrid nanostructure, room temperature responsivities of 0.46 A W−1 and 0.25 mA W−1, and detectivities of 2.24 × 1011 and 1.25 × 108 cm √Hz W−1 are obtained at 950 and 1700 nm, respectively. The device also features a high response speed of 7.2/7.6 ns (rise time/fall time) and 194/240 µs at 850 and 1310 nm, respectively. Such broadband, wavelength‐selective, and high‐speed hybrid NA‐NP Si Schottky photodetectors, with extended detection wavelength, are promising for Si‐based photonic systems for material identification, spectroscopy, imaging, and night vision applications.