Optimization of plasmon nano-focusing in tapered metal rods

Vogel, Michael W. and Gramotnev, Dmitri K. (2008) Optimization of plasmon nano-focusing in tapered metal rods. Journal of Nanophotonics, 2 021852-1-021852-17. doi:10.1117/1.3046689

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Author Vogel, Michael W.
Gramotnev, Dmitri K.
Title Optimization of plasmon nano-focusing in tapered metal rods
Journal name Journal of Nanophotonics   Check publisher's open access policy
ISSN 1934-2608
Publication date 2008-11-21
Sub-type Article (original research)
DOI 10.1117/1.3046689
Open Access Status File (Publisher version)
Volume 2
Start page 021852-1
End page 021852-17
Total pages 17
Place of publication Bellingham, WA, United States
Publisher S P I E - International Society for Optical Engineering
Language eng
Abstract Analysis of adiabatic and non-adiabatic nano-focusing in tapered metal nano-rods leads to the determination of optimal taper angles and rod lengths as functions of material parameters (for gold, silver, and aluminum) at frequencies from the optical and near infra-red ranges. The considered nano-focusing structures appear to be highly tolerant to such structural and fabrication imperfections as variations of length of the rod and taper angle around their optimal values. However, the major parameter that tends to sig-nificantly affect the nano-focusing capabilities of the rods is the radius of the tip, and this is the parameter that should be carefully reproduced in the experiments. Comparison of the numerical results with the adiabatic theory of nano-focusing for different metals and different wavelengths demonstrates the validity of the adiabatic theory in a much wider range of taper angles (up to tens of degrees) than it was previously expected. Major predicted local field enhancements of up to ~ 2,500 times in the considered structures within nano-scale regions as small as a few nanometers will make tapered metal rods highly promising for single molecule detection and development of a new generation of sensors, measurement and nano-manipulation techniques. © 2008 Society of Photo-Optical Instrumentation Engineers
Keyword Surface plasmons
Local field enhancement
Near-field optics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Article number 21852

Document type: Journal Article
Sub-type: Article (original research)
Collections: ERA 2012 Admin Only
Centre for Advanced Imaging Publications
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 11 times in Scopus Article | Citations
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Created: Mon, 14 Feb 2011, 16:19:53 EST by Mr Michael Vogel on behalf of Centre for Advanced Imaging