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Journal of Nanophotonics

Near-field enhancement for infrared sensor applications
Author(s): Juan Jose Sanz-Fernandez; Carolina Mateo-Segura; Rebecca Cheung; George Goussetis; Marc P. Y. Desmulliez
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Paper Abstract

A detailed investigation on planar two dimensional metallodielectric dipole arrays with enhanced near-fields for sensing applications was carried out. Two approaches for enhancing the near-fields and increasing the quality factor were studied. The reactive power stored in the vicinity of the array at resonance increases rapidly with increasing periodicity. Higher quality factors are produced as a result. The excitation of the odd mode in the presence of a perturbation gives rise to a sharp resonance with near-field enhanced by at least an order of magnitude compared to unperturbed arrays. The trade-off between near-field enhancement and thermal losses was also studied, and the effect of supporting dielectric layers on thermal losses and quality factors were examined. Secondary transmissions due to the dielectric alone were found to enhance and reduce cyclically the quality factor as a function of the thickness of the dielectric material. The performance of a perturbed frequency selective surface in sensing nearby materials was investigated. Finally, unperturbed and perturbed arrays working at infrared frequencies were demonstrated experimentally.

Paper Details

Date Published: 1 January 2011
PDF: 11 pages
J. Nanophoton. 5(1) 051814 doi: 10.1117/1.3604785
Published in: Journal of Nanophotonics Volume 5, Issue 1
Show Author Affiliations
Juan Jose Sanz-Fernandez, The Univ. of Edinburgh (United Kingdom)
Carolina Mateo-Segura, Queen Mary, Univ. of London (United Kingdom)
Rebecca Cheung, The Univ. of Edinburgh (United Kingdom)
George Goussetis, Queen's Univ. Belfast (United Kingdom)
Marc P. Y. Desmulliez, Heriot-Watt Univ. (United Kingdom)

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