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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 5, Iss. 6 — Apr. 8, 2010

Coupling discrete metal nanoparticles to photonic crystal surface resonant modes and application to Raman spectroscopy

Seok-min Kim, Wei Zhang, and Brian T. Cunningham  »View Author Affiliations


Optics Express, Vol. 18, Issue 5, pp. 4300-4309 (2010)
http://dx.doi.org/10.1364/OE.18.004300


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Abstract

Coupling a tightly packed layer of discrete metal nanoparticles to the resonant mode of a photonic crystal surface has been demonstrated as a means for obtaining additional electromagnetic gain for surface-enhanced Raman spectroscopy (SERS), in which electric fields of the photonic crystal can couple to plasmon resonances of the metal nanoparticles. Because metal nanoparticles introduce absorption that quench the photonic crystal resonance, a balance must be achieved between locating the metal nanoparticles too close to the surface while still positioning them within the enhanced evanescent field to maximize coupling to surface plasmons. In this work, we describe a parametric study into the design of a photonic crystal-SERS substrate, comprised of a replica molded photonic crystal slab as the dielectric optical resonator, a SiO2 “post” layer spacer, and an Ag “cap” metal nanostructure. Using the Raman signal for trans-1,2-bis(4pyridyl)ethane, the coupling efficiency was maximized for a SiO2 “post” layer thickness of 50 nm and a Ag “cap” height of ~20 nm, providing an additional enhancement factor of 21.4.

© 2010 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(220.4241) Optical design and fabrication : Nanostructure fabrication
(230.4555) Optical devices : Coupled resonators
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(050.5298) Diffraction and gratings : Photonic crystals
(240.6695) Optics at surfaces : Surface-enhanced Raman scattering

ToC Category:
Photonic Crystals

History
Original Manuscript: January 8, 2010
Revised Manuscript: February 4, 2010
Manuscript Accepted: February 11, 2010
Published: February 17, 2010

Virtual Issues
Vol. 5, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Seok-min Kim, Wei Zhang, and Brian T. Cunningham, "Coupling discrete metal nanoparticles to photonic crystal surface resonant modes and application to Raman spectroscopy," Opt. Express 18, 4300-4309 (2010)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-18-5-4300


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