Enhancing extraordinary transmission of light through a metallic nanoslit with a nanocavity antenna
2009 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 34, no 1, 16-18 p.Article in journal (Refereed) Published
The extraordinary transmission of light through a vertical nanoslit in a metal film is enhanced by introducing a nanocavity antenna formed by a nearby metallic nanostrip over the slit opening. For a fixed wavelength, the width of the metallic nanostrip should be chosen to make the horizontal metal-insulator-metal waveguide of finite length resonant as a Fabry-Perot cavity. When such a cavity antenna is used to enhance the transmission through a nonresonant nanoslit, the slit should be opened at a position with a maximal magnetic field in the horizontal resonant cavity. It is shown that an optimized cavity antenna can enhance greatly the transmission of light through a nonresonant nanoslit (by about 20 times) or a resonant nanoslit (by 124%). Such a transmission enhancement with a nanocavity antenna is studied for the first time, and the physical mechanism is explained.
Place, publisher, year, edition, pages
2009. Vol. 34, no 1, 16-18 p.
IdentifiersURN: urn:nbn:se:kth:diva-18140ISI: 000262889300006ScopusID: 2-s2.0-58149486640OAI: oai:DiVA.org:kth-18140DiVA: diva2:336186
QC 201005252010-08-052010-08-052013-11-19Bibliographically approved