Adiabatic and non-adiabatic nano-focusing of plasmons by tapered gap plasmon waveguides
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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|Item Type:||Journal Article|
|Keywords:||nanofocusing, plasmon, plasmonic, subwavelength, gap plasmon, tapered, waveguide|
|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|
|Last Modified:||29 Feb 2012 23:28|
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