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Resonant cavity-enhanced photodetector incorporating a type-II superlattice to extend MWIR sensitivity

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<mark>Journal publication date</mark>19/08/2019
<mark>Journal</mark>Optics Express
Issue number17
Number of pages11
Pages (from-to)23970-23980
Publication StatusPublished
Early online date6/08/19
<mark>Original language</mark>English


Mid-infrared resonant cavity-enhanced photodetectors (RCE PD) present a promising technology for targeted gas detection. We demonstrate an RCE PD incorporating an InAs/InAsSb superlattice as the detecting element, extending the resonant wavelength beyond 4 µm. AlAsSb/GaSb mirrors and a unipolar barrier active region paralleling an nBn structure are also used, and performance is compared to a conventional broadband nBn detector incorporating the same superlattice. The RCE PD exhibited a Q-factor of ∼90 and an extremely stable resonance wavelength. Peak responsivity was 3.0 A W−1 at 240 K, equalling 84% quantum efficiency, a 5.5 times increase over the reference nBn at the same wavelength. Dark current density was 3.3×10−2 A cm−2 at 240 K, falling to 2.7×10−4 A cm−2 at 180 K. The broadband BLIP limit is approached at 180 K with specific detectivity of 2.1×1011 cm Hz1/2 W−1 , which presents the
potential of achieving BLIP-limited operation in the thermoelectric cooling regime.