Light trapping cavity enhanced light transmission through a single sub-wavelength aperture in a metal film

Juuso Olkkonen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We demonstrate that optical transmission of a normally incident, monochromatic plane wave through a single sub-wavelength aperture in an opaque metal film can be substantially enhanced by a thin, semitransparent metal film placed parallel to the opaque metal film in front of the aperture. When the semi-transparent and the opaque metal film are separated by a proper distance, a light trapping cavity is formed and the sub-wavelength aperture exhibits a transmission maximum. An enhancement factor of ~40 is demonstrated for a cylindrical 100 nm diameter hole in a silver film.
Original languageEnglish
Pages (from-to)23992-24001
Number of pages10
JournalOptics Express
Volume17
Issue number26
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

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light transmission
metal films
apertures
trapping
cavities
wavelengths
plane waves
silver
augmentation

Cite this

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abstract = "We demonstrate that optical transmission of a normally incident, monochromatic plane wave through a single sub-wavelength aperture in an opaque metal film can be substantially enhanced by a thin, semitransparent metal film placed parallel to the opaque metal film in front of the aperture. When the semi-transparent and the opaque metal film are separated by a proper distance, a light trapping cavity is formed and the sub-wavelength aperture exhibits a transmission maximum. An enhancement factor of ~40 is demonstrated for a cylindrical 100 nm diameter hole in a silver film.",
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Light trapping cavity enhanced light transmission through a single sub-wavelength aperture in a metal film. / Olkkonen, Juuso (Corresponding Author).

In: Optics Express, Vol. 17, No. 26, 2009, p. 23992-24001.

Research output: Contribution to journalArticleScientificpeer-review

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AB - We demonstrate that optical transmission of a normally incident, monochromatic plane wave through a single sub-wavelength aperture in an opaque metal film can be substantially enhanced by a thin, semitransparent metal film placed parallel to the opaque metal film in front of the aperture. When the semi-transparent and the opaque metal film are separated by a proper distance, a light trapping cavity is formed and the sub-wavelength aperture exhibits a transmission maximum. An enhancement factor of ~40 is demonstrated for a cylindrical 100 nm diameter hole in a silver film.

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