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

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...

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Bibliographic Details
Published in:Optics express 2009-02, Vol.17 (4), p.2334-2340
Main Authors: Gao, H, McMahon, J M, Lee, M H, Henzie, J, Gray, S K, Schatz, G C, Odom, T W
Format: Article
Language:English
Subjects:
Computer Simulation
Gold - chemistry
Models, Chemical
Nanostructures - chemistry
Nanostructures - ultrastructure
Palladium - chemistry
Porosity
Refractometry - methods
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Summary: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 RASPP 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.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.17.002334