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Focusing dynamics on circular distributed tapered metallic waveguides by means of plasmonic vortex lenses |
Optics Letters, Vol. 37, Issue 21, pp. 4516-4518 (2012)
http://dx.doi.org/10.1364/OL.37.004516
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Abstract
We investigate the focusing effect on circularly distributed planar tapered plasmonic waveguides by means of three-dimensional (3D) finite elements simulations. The proposed configuration allows nanofocusing on four faced planar nanotips, showing efficient condensation of surface plasmons polaritons (SPPs) at the silver/air interface toward the endpoint of the tips. By means of a plasmonic vortex lens it is possible to illuminate the tips with SPP waves carrying orbital angular momentum (OAM), namely plasmonic vortices. Our 3D simulations show that by acting on the topological charge of the plasmonic vortex the electric field charge distribution at the tips apex can be controlled accordingly to the input electric field phase distribution. The results for three particular OAM values are shown, along with a generalization for arbitrary plasmonic vortex angular momentum values.
© 2012 Optical Society of America
OCIS Codes
(230.5440) Optical devices : Polarization-selective devices
(240.6680) Optics at surfaces : Surface plasmons
(050.4865) Diffraction and gratings : Optical vortices
(250.5403) Optoelectronics : Plasmonics
(260.6042) Physical optics : Singular optics
ToC Category:
Optoelectronics
History
Original Manuscript: August 24, 2012
Manuscript Accepted: September 28, 2012
Published: October 29, 2012
Citation
Tommaso Ongarello, Giuseppe Parisi, Denis Garoli, Elettra Mari, Pierfrancesco Zilio, and Filippo Romanato, "Focusing dynamics on circular distributed tapered metallic waveguides by means of plasmonic vortex lenses," Opt. Lett. 37, 4516-4518 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-21-4516
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