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Geometrical phase and surface plasmon focusing with azimuthal polarization |
Optics Letters, Vol. 37, Issue 4, pp. 581-583 (2012)
http://dx.doi.org/10.1364/OL.37.000581
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Abstract
Owing to a geometric phase effect, an isosceles triangular aperture etched into thin metal film leads to constructive or destructive interference of surface plasmons excited at the two equal sides under linearly polarized illumination. Through appropriate spatial arrangement of an array of triangles, a highly confined focal spot beyond the diffraction limit can be achieved at the geometric center under azimuthally polarized excitation with field enhancement comparable to a bull’s eye plasmonic lens under radially polarized illumination. Through simply rotating the orientation of each triangle aperture by 90°, the plasmonic structure defocuses the same azimuthal polarization illumination due to destructive interference caused by a geometric
© 2012 Optical Society of America
OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3160) Physical optics : Interference
(260.5430) Physical optics : Polarization
(050.6624) Diffraction and gratings : Subwavelength structures
ToC Category:
Physical Optics
History
Original Manuscript: October 5, 2011
Revised Manuscript: December 8, 2011
Manuscript Accepted: December 21, 2011
Published: February 9, 2012
Citation
Weibin Chen, Robert L. Nelson, and Qiwen Zhan, "Geometrical phase and surface plasmon focusing with azimuthal polarization," Opt. Lett. 37, 581-583 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-4-581
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