Abstract

Hot electron detectors (HEDs) based on plasmon resonance can circumvent a semiconductor’s bandgap limitation and have high sensitivity, suitable for infrared gas detectors. Unfortunately, there are few literature reports on research in the mid-infrared (MIR) region. Herein, we design and optimize a HED based on Al/GaAs fishnet nanostructure for MIR ${{\rm{CO}}_2}$ sensing, and its optical–electrical properties are numerically studied. Surface plasmons not only achieve strong absorptance at ${{\rm{CO}}_2}$ emission wavelength but also greatly improve the photoelectric responsivity over a plane structure detector (${\sim}{{42}}\;{\rm{times}}$). By changing the thickness of the GaAs layer, the detection wavelength can also be actively adjusted, achieving a larger range of multi-gas detection. The effect of external voltage is also considered. This work highlights a potential engineering application value and offers a path toward more compact and efficient MIR gas detectors.

© 2022 Optica Publishing Group

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