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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 8 — Apr. 9, 2012
  • pp: 8629–8640

Linear and nonlinear optical properties of Ag/Au bilayer thin films

James Hsu, Canek Fuentes-Hernandez, Alfred R. Ernst, Joel M. Hales, Joseph W. Perry, and Bernard Kippelen  »View Author Affiliations


Optics Express, Vol. 20, Issue 8, pp. 8629-8640 (2012)
http://dx.doi.org/10.1364/OE.20.008629


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Abstract

The linear and nonlinear optical properties of Ag/Au bilayer metallic thin films with a total thickness of around 20 nm and with different Ag/Au mass-thickness ratios were studied. This study shows that the spectral dispersion of the effective refractive index of bilayer films can be tuned by controlling the mass-thickness ratio between Au and Ag. Improvement of the figure-of-merit for potential plasmonic applications and linear optical filters in the visible spectral range are reported and discussed. The nonlinear optical properties of bilayer metal films studied using femtosecond white-light continuum pump-probe experiments are also shown to be tunable with this ratio. The nonlinear change of optical path length is extracted from the pump-probe data and agrees with simulated values derived from a combination of the two-temperature model, describing the ultrafast electron heating dynamics, and a physical model that describes the dielectric permittivity of Au as a function of electron and lattice temperature.

© 2012 OSA

OCIS Codes
(160.3900) Materials : Metals
(240.6680) Optics at surfaces : Surface plasmons
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Thin Films

History
Original Manuscript: February 22, 2012
Revised Manuscript: March 16, 2012
Manuscript Accepted: March 19, 2012
Published: March 28, 2012

Citation
James Hsu, Canek Fuentes-Hernandez, Alfred R. Ernst, Joel M. Hales, Joseph W. Perry, and Bernard Kippelen, "Linear and nonlinear optical properties of Ag/Au bilayer thin films," Opt. Express 20, 8629-8640 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-8-8629


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