Adiabatic nanofocusing of plasmons by a sharp metal wedge on a dielectric substrate
We demonstrate that efficient adiabatic nanofocusing of plasmons can be achieved using a sharp metal wedge (thin tapered film) on a dielectric substrate. It is shown that the quasi-symmetric (with respect to the charge distribution across the wedge) plasmon mode can experience infinite adiabatic slowing down with both its phase and group velocities reducing to zero as the plasmon propagates towards the tip of the wedge. Conditions for strong local field enhancement near the tip are determined and analyzed. In particular, it is demonstrated that the electric field in the plasmon experiences much stronger local enhancement than the magnetic field. Two distinct asymptotic regimes with the electric field amplitude approaching either zero or infinity at the tip of the wedge (tapered film) are described. The results are compared to adiabatic nanofocusing of plasmons by metallic V-grooves and sharp metal wedges in a uniform dielectric.
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|Item Type:||Journal Article|
|Keywords:||Surface plasmons, Nanofocusing, Near, field microscopy, Nano, optics, Optical sensors|
|Subjects:||Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400) > Condensed Matter Physics not elsewhere classified (020499)|
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500) > Optical Physics not elsewhere classified (020599)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700) > Nanotechnology not elsewhere classified (100799)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2007 American Institute of Physics|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||19 Mar 2007|
|Last Modified:||29 Feb 2012 23:38|
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