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Proceedings Paper

Infrared resonant absorption by coupled surface plasmon modes in an ultra-thin metamaterial
Author(s): Peter Hobson; Piers Andrew; Benny Hallam; Chris Lawrence
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Paper Abstract

We report angle-resolved infrared reflectivity measurements from a substantially sub-wavelength thickness, textured, metal-dielectric-metal microcavity. The two-dimensional surface texturing causes the structure to support flat-band, surface plasmon modes exhibiting efficient diffractive coupling to free radiation. Additionally, we observe a transverse magnetic mode that is due to phonon absorption within the dielectric spacer layer of the structure. The nature of these electromagnetic modes, their mutual interactions and the device band structure has been characterized by numerical modelling of the experimental data. With the exception of the phonon mode, the analyzed modes show that absorption of incident radiation predominantly occurs in the metal layers of the structure and at frequencies dictated by the geometry of the patterned top surface.

Paper Details

Date Published: 12 September 2014
PDF: 12 pages
Proc. SPIE 9160, Metamaterials: Fundamentals and Applications 2014, 916011 (12 September 2014); doi: 10.1117/12.2061055
Show Author Affiliations
Peter Hobson, QinetiQ Ltd. (United Kingdom)
Piers Andrew, Nokia Research Ctr. (United Kingdom)
Benny Hallam, Imerys Minerals Ltd. (United Kingdom)
Chris Lawrence, QinetiQ Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 9160:
Metamaterials: Fundamentals and Applications 2014
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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