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


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
Issue number26
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed


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