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A theoretical re-examination of giant transmission of light through a metallic nano-slit surrounded with periodic grooves
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-3401-1125
2009 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 17, no 16, 13995-14000 p.Article in journal (Refereed) Published
Abstract [en]

We show that the slit-to-groove distance for a maximal transmission through the nano-slit surrounded with periodic grooves cannot be predicted by the theory of constructive interference between the groove-generated surface plasmon wave (SPW) and the incident wave. A clear physical explanation is given for the dependence of the transmission on the slit-to-groove distance. It is shown that the influence to the transmission comes from three parts: the groove-generated SPW, the incident wave and the nano-slit-generated SPW. The groove-generated SPW is the main factor determining the local field distribution around the nano-slit opening. The influence of the incident wave is very weak when strong SPW is generated on the input surface by many periods of deep grooves. The nano-slit-generated SPW can also be considered as a disturbance to the light distribution on the input surface.

Place, publisher, year, edition, pages
2009. Vol. 17, no 16, 13995-14000 p.
Keyword [en]
evanescent-wave model, subwavelength hole arrays, optical-transmission, apertures
Identifiers
URN: urn:nbn:se:kth:diva-18677ISI: 000268843700077Scopus ID: 2-s2.0-68349157543OAI: oai:DiVA.org:kth-18677DiVA: diva2:336724
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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