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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 4 — Feb. 15, 2012
  • pp: 581–583

Geometrical phase and surface plasmon focusing with azimuthal polarization

Weibin Chen, Robert L. Nelson, and Qiwen Zhan  »View Author Affiliations


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 π-phase difference between the two sides of the triangle and between the adjacent triangles.

© 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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