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Jun, Young Chul
Laboratory of Nanophotonics & Metamaterials (NanoMeta)
Research Interests
  • Nanophotonics, plasmonics, metamaterials, 4D printing, programmable matter, smart materials

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Simulation and analysis of grating-integrated quantum dot infrared detectors for spectral response control and performance enhancement

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Title
Simulation and analysis of grating-integrated quantum dot infrared detectors for spectral response control and performance enhancement
Author
Kim, Jun OhKu, ZahyunKrishna, SanjayKang, Sang-WooLee, Sang JunJun, Young ChulUrbas, Augustine
Keywords
WAVE-GUIDE; PHOTODETECTORS; ARRAYS; EFFICIENCY; PROGRESS; DESIGN
Issue Date
201404
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.115, no.16, pp. -
Abstract
We propose and analyze a novel detector structure for pixel-level multispectral infrared imaging. More specifically, we investigate the device performance of a grating-integrated quantum dots-in-a-well photodetector under backside illumination. Our design uses 1-dimensional grating patterns fabricated directly on a semiconductor contact layer and, thus, adds a minimal amount of additional effort to conventional detector fabrication flows. We show that we can gain wide-range control of spectral response as well as large overall detection enhancement by adjusting grating parameters. For small grating periods, the spectral responsivity gradually changes with parameters. We explain this spectral tuning using the Fabry-Perot resonance and effective medium theory. For larger grating periods, the responsivity spectra get complicated due to increased diffraction into the active region, but we find that we can obtain large enhancement of the overall detector performance. In our design, the spectral tuning range can be larger than 1 mu m, and, compared to the unpatterned detector, the detection enhancement can be greater than 92% and 148% for parallel and perpendicular polarizations. Our work can pave the way for practical, easy-to-fabricate detectors, which are highly useful for many infrared imaging applications. (C) 2014 AIP Publishing LLC
URI
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DOI
http://dx.doi.org/10.1063/1.4871855
ISSN
0021-8979
Appears in Collections:
MSE_Journal Papers
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