The resonant electromagnetic fields of an array of metallic slits acting as Fabry-Perot cavities

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The resonant electromagnetic fields of an array of metallic slits acting as Fabry-Perot cavities

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Title: The resonant electromagnetic fields of an array of metallic slits acting as Fabry-Perot cavities
Author: Hibbins, Alastair P.
Lockyear, Matthew J.
Sambles, J. Roy
Citation: 99 (12), article 124903
Publisher: American Institute of Physics
Journal: Journal of Applied Physics
Date Issued: 2006
URI: http://hdl.handle.net/10036/23693
DOI: 10.1063/1.2204818
Links: http://dx.doi.org/10.1063/1.2204818 http://link.aip.org/link/?JAPIAU/99/124903/1
Abstract: Fabry-Perot cavities are perhaps the best known of the optical transmission resonators, with cavity field enhancement accomplished by two parallel and partially reflecting planes. Recently it has been shown that arrays of narrow slits cut into a metal substrate are similarly able to exhibit resonant transmission modes. An analysis of the field solutions and transmission properties of this resonant array is compared to the well-known etalon and dielectric slab geometries, revealing a most elegant illustration of the principles of Maxwell's electromagnetism. It is demonstrated that the matching of the propagating field to each slit-cavity mode is made possible through strong diffraction at each end. Furthermore, the interface between the slit cavities and semi-infinite space beyond acts as a high-impedance surface on resonance, reflecting the field with a positive reflection-amplitude coefficient. Metallic slit arrays have several advantages over conventional Fabry-Perot resonators with interesting application potential.
Type: Article
Description: Copyright © 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics 99 (2006) and may be found at http://link.aip.org/link/?JAPIAU/99/124903/1
Keywords: cavity resonatorsFabry-Perot resonatorsmetallic thin filmslight reflectionMaxwell equationslight propagationlight diffractionoptical arrays
ISSN: 0021-8979


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