Enhanced quantum well infrared photodetector with novel multiple quantum well grating structure

Schimert, Thomas R.; Barnes, S. L.; Brouns, Austin J.; Case, F. C.; Mitra, P.; Claiborne, L.T.

doi:10.1063/1.116344

Cited by 47 publications

(19 citation statements)

References 1 publication

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“…[5][6][7] In particular, metallic gratings have been studied for use with quantum well infrared photodetectors (QWIP) to manipulate the polarization of incoming radiation. These designs, often with large periods 5 and hole filling fractions, are designed to overcome the inability of QWIPs to absorb normally incident light, 8 and do not make use of the rich near field effects and physics associated with localized surface plasmons.…”

Section: Introductionmentioning

confidence: 99%

Extraordinary plasmon-QD interaction for enhanced infrared absorption

et al. 2013

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The use of metallic nanostructures for enhanced transmission and near field phenomena have been a topic of extensive research. Here we present integration of active media, consisting of InAs quantum dots (QD) embedded in quantum wells, with 2 dimensional metallic hole arrays (2DHA) leading to a strong interaction between resonant surface plasmons, excited at the metal-semiconductor interface, and intersubband transitions of quantum dots. The presence of a low-loss absorber within the enhanced near field region of 2DHA leads to an enhancement of photoresponse. The parameters of 2DHA were designed to overlap with absorption peaks of QDs. We present techniques of fabrication, accurate characterization of enhancement and efforts to optimize the 2DHA-QD coupling. Over an order of magnitude enhancement in photoresponse is observed due to spectral matching of intersubband absorption of quantum dots to that of 2DHA resonance, optimal placement of QD within the structure, and improved interaction lengths due to lateral propagation. This enhancement is also accompanied by significant narrowing of linewidth and the ability to tune the resonance by varying the 2DHA parameters. A hexagonal lattice with periodic circular holes on a thin gold film is used as the 2DHA. With further optimizations, these structures have significant applications in the mid-wave infrared (3-5 µm) and long-wave infrared (8-12 µm) regions for multispectral and polarization sensitive sensing.

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Section: Introductionmentioning

confidence: 99%

Extraordinary plasmon-QD interaction for enhanced infrared absorption

et al. 2013

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“…In Fig. 4, the EM model is shown to be able to account for various resonant effects including air cavity resonance [9], dipole antenna resonance [10], plasmonic resonance [11], and photonic crystal resonance [12]. And in Fig.…”

Section: Verification Of the Em Modelmentioning

confidence: 98%

Electromagnetic modeling and resonant detectors and arrays

Choi¹,

Sun²,

DeCuir³

et al. 2015

Infrared Physics & Technology

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“…1. For the Enhanced-QWIP structure (E-QWIP) 5 in Fig. 1(a), the active detector material is etched into a grid structure and the radiation is incident directly onto this grid.…”

Section: Experimental Verificationmentioning

confidence: 99%

Resonator-QWIPs and FPAs

et al. 2014

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The quantum efficiency of QWIPs is difficult to predict and optimize. Recently, we have established a quantitative 3-dimensional electromagnetic model for QE computation. In this work, we used this model to design and optimize new detector structures. In one approach, we adjusted the detector volume to resonate strongly with the scattered light from the diffractive elements (DEs). The resulting intensified field increases the detector QE correspondingly. We tested this resonator-QWIP concept on four detector materials and obtained satisfactory agreements between theory and experiment. The observed single detector QE ranges from 15 to 71%, depending on the realized pixel geometry and the matching detector material. We processed one of the materials into hybridized FPAs and observed a QE of 30% with a conversion efficiency of 11%, in agreement with theory. By using rings as DEs, the FPA spectral nonuniformity can also be minimized with an observed value of 4% in comparison with the 7% for gratings. With a proven EM model, we further designed different R-QWIPs for a wide range of applications, including high conversion efficiency detection, narrow band detection through a medium, narrow band detection at a gaseous medium, simultaneous two-color detection, sequential voltage tunable two-color detection, and broadband detection at Landsat wavelengths. Experimental efforts are underway.

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Enhanced quantum well infrared photodetector with novel multiple quantum well grating structure

Cited by 47 publications

References 1 publication

Extraordinary plasmon-QD interaction for enhanced infrared absorption

Extraordinary plasmon-QD interaction for enhanced infrared absorption

Electromagnetic modeling and resonant detectors and arrays

Resonator-QWIPs and FPAs

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