Adiabatic and non-adiabatic nano-focusing of plasmons by tapered gap plasmon waveguides

Pile, David F. & Gramotnev, Dmitri K. (2006) Adiabatic and non-adiabatic nano-focusing of plasmons by tapered gap plasmon waveguides. Applied Physics Letters, 89(-), 041111.

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Adiabatic and non-adiabatic nano-focusing of plasmons in tapered gap plasmon waveguides is analyzed using the finite-difference time-domain algorithm. Optimal adaptors between two different sub-wavelength waveguides and conditions for maximal local field enhancement are determined, investigated and explained on the basis of dissipative and reflective losses in the taper. Nano-focusing of plasmons into a gap of ~ 1 nm width with more than 20 times increase in the magnetic field intensity is demonstrated in a silver-vacuum taper of ~ 1 micron long. Comparison with the approximate theory based on the geometrical optics approximation is conducted.

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122 citations in Scopus
103 citations in Web of Science®
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ID Code: 5238
Item Type: Journal Article
Refereed: Yes
Keywords: nanofocusing, plasmon, plasmonic, subwavelength, gap plasmon, tapered, waveguide
DOI: 10.1063/1.2236219
ISSN: 0003-6951
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 2006 American Institute of Physics
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 16 Oct 2006 00:00
Last Modified: 29 Feb 2012 13:28

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