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Sensors 2010, 10(9), 8751-8760;

Characteristics of Metal Enhanced Evanescent-Wave Microcavities

Department of Electrical and Electronic System Engineering, Ibaraki National College of Technology, 866 Nakane, Hitachinaka, Ibaraki, Japan
Received: 27 July 2010 / Revised: 9 September 2010 / Accepted: 10 September 2010 / Published: 21 September 2010
(This article belongs to the Special Issue Optical Resonant Microsensors)
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This article presents the concept of storing optical energy using a metallic air gap microcavity. Evanescent waves are stored in the air gap of a dielectric/metal/air gap/metal planar microcavity. For an air gap with a micron scale distance between the two metals, incident light excites the optical interface modes on the two metal-air interfaces simultaneously, being accompanied by enhanced evanescent fields. Numerical simulations show that the reflected light depends remarkably upon distributions of the enhanced electric fields in the air-gap at the optical mode excitations. The metallic microcavities have a Q value on the order of 102, as determined from calculations. Experimentally, a small mechanical variation of the air-gap distance exhibited a change of reflectivity. View Full-Text
Keywords: resonant microcavity; evanescent wave; optical interface mode; light modulation resonant microcavity; evanescent wave; optical interface mode; light modulation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Wakamatsu, T. Characteristics of Metal Enhanced Evanescent-Wave Microcavities. Sensors 2010, 10, 8751-8760.

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