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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 11 — Nov. 1, 2012
  • pp: 3021–3026

Circular dichroism in single-layered gold sawtooth gratings

Wensheng Gao, Ching Yan Ng, Ho Ming Leung, Yunhui Li, Hong Chen, and Wing Yim Tam  »View Author Affiliations


JOSA B, Vol. 29, Issue 11, pp. 3021-3026 (2012)
http://dx.doi.org/10.1364/JOSAB.29.003021


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Abstract

We report on the fabrication of single-layered gold sawtooth gratings consisting of И , V , and N basic units by using an e-beam direct write technique together with a lift-off process. The И - and N -type sawtooth gratings are 2D chiral but not the V -type sawtooth grating. Large circular dichroism (CD) in the visible range is observed for the chiral sawtooth gratings while there is none for the V -type sawtooth grating. The experimental results are modelled qualitatively by simulations using a finite integration technique. The simulations show that the CD observed is due to the difference in the absorption in the metal for circularly polarized incidence light of different handedness. The sawtooth gratings are simple and can be easily mass produced for possible applications in waveplates and circular polarizers.

© 2012 Optical Society of America

OCIS Codes
(160.1585) Materials : Chiral media
(160.3918) Materials : Metamaterials

ToC Category:
Materials

History
Original Manuscript: July 16, 2012
Revised Manuscript: September 6, 2012
Manuscript Accepted: September 11, 2012
Published: October 9, 2012

Citation
Wensheng Gao, Ching Yan Ng, Ho Ming Leung, Yunhui Li, Hong Chen, and Wing Yim Tam, "Circular dichroism in single-layered gold sawtooth gratings," J. Opt. Soc. Am. B 29, 3021-3026 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-11-3021


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