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Title: Frustrated total internal reflection and critical coupling in a thick plasmonic grating with narrow slits

We demonstrate the possibility of critical coupling through frustrated total internal reflection in a thick plasmonic grating below the first diffraction order. Differently from conventional approaches relying on the excitation of surface plasmon-polaritons, here we exploit the light coupling with the leaky modes supported by the grating. This mechanism entails a wide-angle coupling and effectively access spectral bands that would otherwise be difficult to probe using conventional plasmonic critical coupling techniques, such as the Otto configuration. Our finding may pave the way to efficient plasmonic bio-sensor devices.
Authors:
;  [1] ;  [2] ;  [3]
  1. AEgis Technologies, Inc., 410 Jan Davis Dr, Huntsville, Alabama 35806 (United States)
  2. Department of the Army, C. M. Bowden Laboratory, Redstone Arsenal, Alabama 35898 (United States)
  3. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712 (United States)
Publication Date:
OSTI Identifier:
22300060
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CONFIGURATION; COUPLING; DIFFRACTION; EQUIPMENT; EXCITATION; POLARONS; REFLECTION; SENSORS; SURFACES; VISIBLE RADIATION