Abstract
Frequency-selective heat infrared (IR) detectors are promising for numerous new apps such as solar cell detection, gas analysis, multi-color imaging, multi-channel detector, recognition of artificial objects in a natural setting, but these features involve extra filters which lead to elevated costs. Plasmonic metamaterial absorbers (PMAs) can impart frequency selectivity to standard heat, IR detectors merely by regulating the absorber surface geometry to generate surface plasmon resonance at the desired frequency. We present a nanoantenna-based mid-infrared absorber for heat infrared detectors. Our structure uses a portion of the noble metal used in standard absorbers and is only one layer thick, which enables incredibly tiny thermal conductivity leading to possibly very low thermal detector noise. Simulation results show that the proposed nanoantennas can achieve a harvesting efficiency of 40% at a frequency of 150 THz where the antenna input impedance is matched to that of fabricated rectifying devices. Achieve maximum bandwidth Absorber from 100 to 200 THz for application purposes energy harvesting sensor.
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