Optimization of plasmon nano-focusing in tapered metal rods
Analysis of adiabatic and non-adiabatic nano-focusing in tapered metal nanorods 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 significantly 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.
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|Item Type:||Journal Article|
|Keywords:||Surface plasmons, nano-focusing, local field enhancement, near-field optics|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
Past > Schools > School of Physical & Chemical Sciences
|Copyright Owner:||Copyright 2008 International Society for Optical Engineering|
|Copyright Statement:||Web posting policy for papers published in SPIE journals: SPIE grants to authors of papers published in an SPIE journal the right to post an author-prepared version or an official version (preferred version) of the published paper on an internal or external server controlled exclusively by the author/employer, provided that (a) such posting is noncommercial in nature and the paper is made available to users without charge; (b) an appropriate copyright notice and full citation appear with the paper, and (c) a link to SPIE's official online version of the abstract is provided using the DOI (Document Object Identifier) link.|
|Deposited On:||21 May 2009 09:03|
|Last Modified:||09 Jun 2010 23:40|
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