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Proceedings Article

Tunable multilayered nanospheres as probes for surface-enhanced Raman spectroscopy

[+] Author Affiliations
Anil K. Kodali, Rohit Bhargava

Univ. of Illinois at Urbana-Champaign (USA)

Proc. SPIE 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI, 70320V (August 28, 2008); doi:10.1117/12.798168
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From Conference Volume 7032

  • Plasmonics: Metallic Nanostructures and Their Optical Properties VI
  • Mark I. Stockman
  • San Diego, California, USA | August 10, 2008

abstract

Giant electromagnetic field enhancements in the vicinity and within layered nanoparticles supporting surface plasmon resonances provide an excellent opportunity for ultra-sensitive Raman spectroscopy. Using metal nanoparticles, enhancement levels of very high sensitivity are achievable but quantitative control over them has traditionally been poor. We propose here multilayered nanospheres with alternating metal-dielectric layers as optimal and easily tailored probes for enhanced Raman scattering, terming these constructs nano-LAMPs (nano-Layered Metal Particles). A theoretical framework based on electromagnetic scattering calculations is used to describe the influence of parameters of the probes, viz . size, composition and spacing of metal and properties of dielectric layers. A recursive formulation of analytical Mie solution is used to evaluate scattering, and the theoretical tunability of electric field enhancement within the spheres is demonstrated as a function of design parameters. An optimization procedure is devised to obtain optimal configurations under fabrication constraints. While demonstrating significant surface enhancement effects, the optical tunability of nano-LAMPs is shown to provide an ability to design probes for multiple excitation frequencies.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Anil K. Kodali and Rohit Bhargava
"Tunable multilayered nanospheres as probes for surface-enhanced Raman spectroscopy", Proc. SPIE 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI, 70320V (August 28, 2008); doi:10.1117/12.798168; http://dx.doi.org/10.1117/12.798168


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