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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 14 — May. 10, 2012
  • pp: 2606–2615

Surface enhanced absorption and transmission from dye coated gold nanoparticles in thin films

Virendra N. Rai, Arvind K. Srivastava, Chandrachud Mukherjee, and Sudip K. Deb  »View Author Affiliations


Applied Optics, Vol. 51, Issue 14, pp. 2606-2615 (2012)
http://dx.doi.org/10.1364/AO.51.002606


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Abstract

Absorption spectra of gold nanoisland thin film and the composite film of gold having thin coating of Methylene Blue and Rh6G dyes have been studied. Thin gold nanoisland film shows surface plasmon resonance (SPR) peak in the visible wavelength range, which shifts to near infrared with an increase in the thickness of the film. It was found that thin film of gold consists of nanoparticles of different size and shape, particularly nanorods of noncylindrical shapes. A linear relation was found between SPR peak wavelength and the aspect ratio of the nanoparticles in gold thin film. Effective medium refractive index of the gold film is estimated to be 2.5, which decreases with an increase in film thickness. The coating of dyes on gold films splits the SPR peak with an enhanced absorption. Enhancement in absorption of composite film is maximal when the dye absorption peak coincides with the SPR peak; otherwise enhancement in transmission is observed for all the wavelength range. Absorption amplitude of composite film peaks increase with an increase in the gold film thickness, which tend toward saturation for film thickness of 6nm. A correlation shows that absorption spectra can be described by the Maxwell Garnett theory, when the gold nanoparticles have a nearly spherical shape for very thin film (6nm).

© 2012 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(300.1030) Spectroscopy : Absorption
(310.6860) Thin films : Thin films, optical properties
(160.4236) Materials : Nanomaterials

ToC Category:
Thin Films

History
Original Manuscript: October 5, 2011
Revised Manuscript: January 5, 2012
Manuscript Accepted: January 11, 2012
Published: May 8, 2012

Citation
Virendra N. Rai, Arvind K. Srivastava, Chandrachud Mukherjee, and Sudip K. Deb, "Surface enhanced absorption and transmission from dye coated gold nanoparticles in thin films," Appl. Opt. 51, 2606-2615 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-14-2606


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