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Optical design of nanowire absorbers for wavelength selective photodetectors

Mokkapati, Sudha, Saxena, D., Tan, H. H. and Jagadish, C. 2015. Optical design of nanowire absorbers for wavelength selective photodetectors. Scientific Reports 5 , 15339. 10.1038/srep15339

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We propose the optical design for the absorptive element of photodetectors to achieve wavelength selective photo response based on resonant guided modes supported in semiconductor nanowires. We show that the waveguiding properties of nanowires result in very high absorption efficiency that can be exploited to reduce the volume of active semiconductor compared to planar photodetectors, without compromising the photocurrent. We present a design based on a group of nanowires with varying diameter for multi-color photodetectors with small footprint. We discuss the effect of a dielectric shell around the nanowires on the absorption efficiency and present a simple approach to optimize the nanowire diameter-dielectric shell thickness for maximizing the absorption efficiency.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 12 June 2017
Date of Acceptance: 23 September 2015
Last Modified: 23 Jan 2020 04:14

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