<div class="csl-bib-body">
<div class="csl-entry">Giparakis, M., Knötig, H., Detz, H., Beiser, M., Schrenk, W., Schwarz, B., Strasser, G., & Andrews, A. M. (2022). 2.7 μm quantum cascade detector: Above band gap energy intersubband detection. <i>Applied Physics Letters</i>, <i>120</i>(7), 071104-1-071104–4. https://doi.org/10.1063/5.0076856</div>
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dc.identifier.issn
0003-6951
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/78076
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dc.description.abstract
Quantum cascade detectors (QCDs) are mid-infrared and far-infrared, low-noise, photovoltaic detectors utilizing intersubband transitions. This Letter presents an InAs/AlAs0.16Sb0.84 based QCD lattice matched to an InAs substrate. This material system exhibits properties like a low effective electron mass of the well material of 0.023 m0, beneficial for higher optical absorption strength, and a high conduction band offset of 2.1 eV, allowing the design of QCDs in the mid-infrared and near-infrared region. The presented QCD has a peak spectral response at 2.7 μm (0.459 eV), the center of a CO2 absorption band. To enable top side illumination, a grating was implemented. This additionally bypasses absorption by the narrow bandgap 0.345 eV (3.54 μm) InAs substrate material. The QCD has a peak responsivity at a room temperature of 5.63 mA/W and a peak specific detectivity of 1.14 × 108 Jones.
en
dc.language.iso
en
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dc.publisher
AIP Publishing
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dc.relation.ispartof
Applied Physics Letters
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dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
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dc.subject
quantum cascade detectors
en
dc.title
2.7 μm quantum cascade detector: Above band gap energy intersubband detection
