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Wavelength independent normal incident quantum cascade detectors

Author(s): Ravikumar, AP; Sivco, D; Gmachl, Claire F

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Abstract: We demonstrate a novel technique for normal-incident absorption in intersubband infrared detectors by taking advantage of light scattering from the side-walls of a wet-etched mesa. We fabricate 'spiral' and 'hairpin' shaped quantum cascade detector at a peak wavelength of 6.6 μm, and compare their performance with a standard rectangular mesa. We achieve a peak responsivity of 6 mA/W for the spiral and 12 mA/W for the hairpin detectors at normal incidence, comparable to the 8.8 mA/W obtained for the mesa at 45 degree incidence. We obtain a background limited detectivity of about 3 � 1010 cm√Hz/W for the spiral and hairpin detectors at 80 K, compared to 3 � 108 cm√Hz/W for the standard mesa. This method to achieve normal incidence absorption is wavelength independent, and does not involve complicated fabrication procedures, paving the way for widespread use of intersubband detectors in sensor applications.
Publication Date: 20-Oct-2016
Electronic Publication Date: 20-Oct-2016
Citation: Ravikumar, AP, Sivco, D, Gmachl, CF. (2016). Wavelength independent normal incident quantum cascade detectors. Optics Express, 24 (25269 - 25276. doi:10.1364/OE.24.025269
DOI: doi:10.1364/OE.24.025269
Pages: 25269 - 25276
Type of Material: Journal Article
Journal/Proceeding Title: Optics Express
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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