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Distance and temperature dependent plasmon-enhanced carrier generation and diffusion in InAs/InGaAs/GaAs near-infrared photodetectors
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Paper Abstract

Compared to the highly sensitive silicon based affordable visible light detectors, infrared photodetectors require significant improvement. Localized surface plasmon resonances of metal nanoparticles can be utilized for increasing the absorption efficiency of semiconductors suited for detection of infrared radiation. In this work, plasmonic gold nanorods (AuNRs) are used to enhance generation of charge carriers and photon emission by InAs/InGaAs/GaAs quantum dots-in-a-well semiconductor heterostructures. Comparison of measured and calculated scattering spectra reveals that the AuNRs on GaAs exhibit red to green colors depending on their proximity to the GaAs surface. On the other hand, theoretical and experimental near-field optical characterization show that the electric field is tightly localized at the AuNR-GaAs interfacial regions, creating a convenient platform for investigating localized carrier generation and diffusion by monitoring the emission of InAs QDs. The carrier generation and photon emission enhancement is studied as a function of the GaAs thickness (distance) and temperature. Analysis of the QD emission enhancement as a function of distance reveals a Förster radius of 3.85 ± 0.15 nm, a near-field decay length of 4.8 ± 0.1 nm and an effective carrier diffusion length of 64.0 ± 3.0 nm. These distance parameters indicate two emission enhancement mechanisms: plasmon enhanced carrier generation inside the GaAs layer and diffusion to the InAs QDs, and direct near-field excitation of the InAs/InGaAs quantum well. The emission enhancement increases with temperature, confirming the importance of charge carrier diffusion from the GaAs to the InAs QDs, where recombination and photon emission takes place.

Paper Details

Date Published: 30 August 2017
PDF: 9 pages
Proc. SPIE 10404, Infrared Sensors, Devices, and Applications VII, 1040408 (30 August 2017); doi: 10.1117/12.2275787
Show Author Affiliations
Terefe G. Habteyes, The Univ. of New Mexico (United States)
Sharmin Haq, The Univ. of New Mexico (United States)
Sadhvikas Addamane, The Univ. of New Mexico (United States)
Bijesh Kafle, The Univ. of New Mexico (United States)
Ganesh Balakrishnan, The Univ. of New Mexico (United States)
Danhong Huang, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 10404:
Infrared Sensors, Devices, and Applications VII
Paul D. LeVan; Ashok K. Sood; Priyalal Wijewarnasuriya; Arvind I. D'Souza, Editor(s)

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