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Proceedings Paper

A normal-incident quantum well infrared photodetector enhanced by surface plasmon resonance
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Paper Abstract

Quantum well infrared photodetectors (QWIPs) have demonstrated applications in many different areas, such as medical and biological imaging, environmental and chemical monitoring, and infrared imaging for space and night vision. However, QWIPs still suffer from low quantum efficiency and detectivity compared with mercury cadmium telluride (MCT) based interband photodetectors, which dominate current infrared detector market. Besides, n-type QWIPs cannot detect the normal incident infrared radiations because of the polarization selection rules of intersubband transitions. Here, we used periodic holes array perforated in gold film to convert normal-incident infrared light to surface plasmon waves, which can excite the intersubband transitions and be absorbed by quantum wells (QWs). Our 3D FDTD simulation results show that electric field component in the QWs growth direction can be enhanced by more than 5 times compared with the total electric field intensity without any plasmonic arrays. The experimental results show that the photodetector has a peak detection wavelength at ~8 μm with a high detectivity of ~7.4×1010 Jones, and the photocurrent spectrum was very close to the simulation result of the electric field enhancement spectrum.

Paper Details

Date Published: 18 August 2010
PDF: 6 pages
Proc. SPIE 7780, Detectors and Imaging Devices: Infrared, Focal Plane, Single Photon, 77801A (18 August 2010); doi: 10.1117/12.871877
Show Author Affiliations
Wei Wu, Northwestern Univ. (United States)
Alireza Bonakdar, Northwestern Univ. (United States)
Ryan Gelfand, Northwestern Univ. (United States)
Hooman Mohseni, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 7780:
Detectors and Imaging Devices: Infrared, Focal Plane, Single Photon
Eustace L. Dereniak; Randolph E. Longshore; Manijeh Razeghi; John P. Hartke; Ashok K. Sood; Paul D. LeVan, Editor(s)

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