Field enhancement and saturation of millimeter waves inside a metallic nanogap

This paper investigates the millimeter electromagnetic waves passing through a metal nanogap. Based upon the study of a perfect electrical conductor model, we show that the electric field enhancement inside the gap saturates as the gap size approaches zero, and the ultimate enhancement strength is i...

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Bibliographic Details
Published in:Optics express 2014-06, Vol.22 (12), p.14402-14410
Main Authors: Lin, Junshan, Oh, Sang-Hyun, Nguyen, Hoai-Minh, Reitich, Fernando
Format: Article
Language:English
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Summary:This paper investigates the millimeter electromagnetic waves passing through a metal nanogap. Based upon the study of a perfect electrical conductor model, we show that the electric field enhancement inside the gap saturates as the gap size approaches zero, and the ultimate enhancement strength is inversely proportional to the thickness of the metal film. In addition, no significant enhancement can be gained by decreasing the gap size further if the aspect ratio between the dimensions of the underlying geometric structure exceeds approximately 100.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.22.014402