On long-range plasmonic modes in metallic gaps
Satuby and Orenstein [Opt. Express 15, 4247-4252 (2007)] reported the discovery and numerical and experimental investigation of long-range surface plasmon-polariton eigenmodes guided by wide (6 to 12 micrometer) rectangular gaps in 400 nm thick gold films using excitation of vacuum wavelength lambda = 1.55 micrometer. In this paper, we carry out a detailed numerical analysis of the two different types of plasmonic modes in these structures. We show that no long-range eigenmodes exists for these gap plasmon waveguides, and that the reported "modes" are likely to be beams of bulk waves and surface plasmons, rather than guided modes of the considered structures.
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|Item Type:||Journal Article|
|Additional Information:||The contents of this journal can be freely accessed online via the journal's web page (see hypertext link).|
|Keywords:||plasmon, plasmonic, surface plasmon, surface wave, gap plasmons, subwavelength, slot, waveguide, nano, optics|
|Subjects:||Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2007 Optical Society of America|
|Deposited On:||03 Jun 2008|
|Last Modified:||29 Feb 2012 13:38|
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