Nanowire-based frequency-selective capacitive photodetector for resonant detection of infrared radiation at room temperature

摘要

Characteristics of a capacitive infrared photodetector that works at room temperature by registering a change in capacitance upon illumination are reported. If used in an ideal resonant inductor-resistor-capacitor circuit, it can exhibit zero dark current, zero standby power dissipation, infinite detectivity, and infinite light-to-dark contrast ratio. It is also made frequency-selective by employing semiconductor nanowires that selectively absorb photons of energies close to the nanowire's bandgap. Based on measured parameters, the normalized detectivitv is estimated to be ～3 × 10~7 Jones for 1.6 μm IR wavelength at room temperature.