Adiabatic nanofocusing of plasmons by sharp metallic wedges
This paper demonstrates the possibility of efficient adiabatic nano-focusing of plasmons by a sharp triangular metal wedge. Geometrical optics approach and the approximation of continuous electrodynamics are used for the analysis. In particular, it is demonstrated that both the phase and group velocities of an incident anti-symmetric (with respect to the magnetic field) plasmon tend to zero at the tip of the wedge, and the plasmon adiabatically slows down, eventually dissipating in the metal. Typically, the amplitude of the plasmon significantly increases near the wedge tip, but this increase is finite even in the absence of dissipation in the metal. The dependence of the local field enhancement near the tip on structural parameters, dissipation in the metal, angle of incidence, etc. is analyzed in this paper. It is also shown that an anti-symmetric film plasmon can effectively be guided by a triangular metal wedge, forming a wedge plasmon mode that is localized near the tip of the wedge and propagates along this tip. A new existence condition for these localized wedge plasmons is derived and discussed.
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|Item Type:||Journal Article|
|Keywords:||plasmon, nano, optics, nano, focusing|
|Subjects:||Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500)|
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > QUANTUM PHYSICS (020600) > Quantum Physics not elsewhere classified (020699)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2007 Springer|
|Copyright Statement:||The original publication is available at SpringerLink (use hypertext links above) http://www.springerlink.com|
|Deposited On:||19 Mar 2007|
|Last Modified:||29 Feb 2012 23:38|
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