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Reflection suppression and absorption enhancement of optical field at thin metal gratings with narrow slits |
Optics Letters, Vol. 37, Issue 18, pp. 3759-3761 (2012)
http://dx.doi.org/10.1364/OL.37.003759
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Abstract
Optically thin metal gratings of high filling factor can support surface plasmon polariton modes at their horizontal metal boundaries and vertical cavity modes inside their slits. These modes are coupled through the metal stripes and the slits. This letter shows that the resonant interactions between the modes critically influence the optical field distribution near the grating and substantially enhance several phenomena such as low reflection, low transmission, and high absorption of the electromagnetic radiation. A high degree of energy confinement is obtained, especially when the energy is stored almost exclusively on the far side of the grating, away from the incident radiation. It is numerically shown that this phenomenon originates from the interaction of field modes with the collective motion of free electrons, as considered in the Drude model.
© 2012 Optical Society of America
OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(240.0240) Optics at surfaces : Optics at surfaces
(260.0260) Physical optics : Physical optics
(290.0290) Scattering : Scattering
ToC Category:
Diffraction and Gratings
History
Original Manuscript: April 9, 2012
Revised Manuscript: July 18, 2012
Manuscript Accepted: July 24, 2012
Published: September 5, 2012
Citation
A. Roszkiewicz and W. Nasalski, "Reflection suppression and absorption enhancement of optical field at thin metal gratings with narrow slits," Opt. Lett. 37, 3759-3761 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-18-3759
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