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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 4 — Feb. 16, 2009
  • pp: 2334–2340

Rayleigh anomaly-surface plasmon polariton resonances in palladium and gold subwavelength hole arrays

H. Gao, J. M. McMahon, M. H. Lee, J. Henzie, S. K. Gray, G. C. Schatz, and T. W. Odom  »View Author Affiliations


Optics Express, Vol. 17, Issue 4, pp. 2334-2340 (2009)
http://dx.doi.org/10.1364/OE.17.002334


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Abstract

Surface plasmon polaritons (SPPs) and Rayleigh anomalies (RAs) are two characteristic phenomena exhibited by periodic grating structures made of plasmonic materials. For Au subwavelength hole arrays, SPPs and RAs from opposite sides of the film can interact under certain conditions to produce highly intense, narrow spectral features called RA-SPP resonances. This paper reports how RA-SPP effects can be achieved in subwavelength hole arrays of Pd, a weak plasmonic material. Well-defined resonances are observed in measured and simulated optical transmission spectra with RA-SPP peaks as narrow as 45 nm (FWHM). Dispersion diagrams compiled from angle-resolved spectra show that RA-SPP resonances in Pd hole arrays shift in wavelength but do not decrease significantly in amplitude as the excitation angle is increased, in contrast with RA-SPP peaks in Au hole arrays. The apparent generality of the RA-SPP effect enables a novel route to optimize resonances in non-traditional plasmonic media.

© 2009 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(290.3030) Scattering : Index measurements
(160.4236) Materials : Nanomaterials
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optics at Surfaces

History
Original Manuscript: December 18, 2008
Revised Manuscript: January 30, 2009
Manuscript Accepted: February 1, 2009
Published: February 5, 2009

Citation
H. Gao, J. M. McMahon, M. H. Lee, J. Henzie, S. K. Gray, G. C. Schatz, and T. W. Odom, "Rayleigh anomaly-surface plasmon polariton resonances in palladium and gold subwavelength hole arrays," Opt. Express 17, 2334-2340 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-4-2334


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