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Dual-band absorber for multispectral plasmon-enhanced infrared photodetection

Yu, P; Wu, J; Ashalley, E; Govorov, A; Wang, Z; (2016) Dual-band absorber for multispectral plasmon-enhanced infrared photodetection. Journal Of Physics D: Applied Physics , 49 (36) , Article 365101. 10.1088/0022-3727/49/36/365101. Green open access

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Abstract

For most of the reported metamaterial absorbers, the peak absorption only occurs at one single wavelength. Here, we investigated a dual-band absorber which is based on simple gold nano-rings. Two absorption peaks can be readily achieved in 3–5 µm and 8–14 µm via tuning the width and radius of gold nano-rings and dielectric constant. The average maximum absorption of two bands can be as high as 95.1% (−0.22 dB). Based on the simulation results, the perfect absorber with nano-rings demonstrates great flexibility to create dual-band or triple-band absorption, and thus holds potential for further applications in thermophotovoltaics, multicolor infrared focal plane arrays, optical filters, and biological sensing applications.

Type: Article
Title: Dual-band absorber for multispectral plasmon-enhanced infrared photodetection
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0022-3727/49/36/365101
Publisher version: http://dx.doi.org/10.1088/0022-3727/49/36/365101
Language: English
Additional information: Copyright © 2016 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in the Journal Of Physics D: Applied Physics. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/0022-3727/49/36/365101
Keywords: metamaterials, dual-band, plasmonics, infrared detector, perfect absorber, FDTD
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
URI: https://discovery.ucl.ac.uk/id/eprint/1522579
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