Shape effects in tapered metal rods during adiabatic nanofocusing of plasmons

Vogel, Michael W. and Gramotnev, Dmitri K. (2010) Shape effects in tapered metal rods during adiabatic nanofocusing of plasmons. Journal of Applied Physics, 107 4: 044303-1-044303-8. doi:10.1063/1.3309409

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Author Vogel, Michael W.
Gramotnev, Dmitri K.
Title Shape effects in tapered metal rods during adiabatic nanofocusing of plasmons
Journal name Journal of Applied Physics   Check publisher's open access policy
ISSN 0021-8979
Publication date 2010-02
Sub-type Article (original research)
DOI 10.1063/1.3309409
Open Access Status File (Publisher version)
Volume 107
Issue 4
Start page 044303-1
End page 044303-8
Total pages 8
Place of publication College Park, MD, United States
Publisher American Institute of Physics
Collection year 2011
Language eng
Formatted abstract
We studied adiabatic nanofocusing of strongly localized surface plasmons in tapered metal rods with parabolic perturbations of the conical shape of the taper. Typical plasmon propagation parameters and local field enhancements are determined along the tapered rod, depending on the shape and plasmon frequency (wavelength). In particular, it is demonstrated that metal rods with tapered convex shape are more efficient in achieving larger local field enhancements at the tip, as compared to rods with the concave shape of the taper. This is explained by weaker dissipative losses in tapered rods with convex shape. In addition, plasmon nanofocusing in tapered rods with convex shape is less sensitive to further variations of the shape. As a result, it is demonstrated that tapered rods with the convex shape could be advantageous for practical applications where strong local field enhancement near the tip is required, and/or where metal rods with relatively large dissipation are used. The obtained results will be important for optimization and practical fabrication of efficient nanofocusing structures using tapered metal rods.
© 2010 American Institute of Physics.
Keyword Adiabatic nanofocusing
Tapered metal rods
Conical shape
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ
Additional Notes Article # 044303

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
Centre for Advanced Imaging Publications
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 18 times in Scopus Article | Citations
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Created: Mon, 14 Feb 2011, 16:23:35 EST by Mr Michael Vogel on behalf of Centre for Advanced Imaging