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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 25, Iss. 8 — Aug. 1, 2008
  • pp: 1371–1379

Linear optical response of metallic nanoshells in different dielectric media

O. Peña, U. Pal, L. Rodríguez-Fernández, and A. Crespo-Sosa  »View Author Affiliations


JOSA B, Vol. 25, Issue 8, pp. 1371-1379 (2008)
http://dx.doi.org/10.1364/JOSAB.25.001371


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Abstract

Metal nanoshells, which consist of nanometer-scale dielectric cores surrounded by thin metallic shells, have been designed and studied for their linear optical responses. The plasmon resonance of metal nanoshells displays geometric tunability controlled by the ratio of shell thickness either to the core radius or to the total radius of the particle. Using Mie theory the surface plasmon resonance (SPR) of metallic nanoshells (Au, Ag, Cu) is studied for different geometries and physical environments. Considering a final radius of about 20 nm , the SPR peak position can be tuned from 510 nm ( 2.43 eV ) to 660 nm ( 1.88 eV ) for Au, from 360 nm ( 3.44 eV ) to 560 nm ( 2.21 eV ) for Ag, and from 553 nm ( 2.24 eV ) to 655 nm ( 1.89 eV ) for Cu, just by varying the ratio t R Shell and the environments inside and outside. With the decrease of the t R Shell ratio the SPR peak position gets redshifted exponentially and the shift is higher for a higher refractive index surroundings. The plasmon linewidth strongly depends on the surface scattering process and its FWHM increases with the reduction of shell thickness.

© 2008 Optical Society of America

OCIS Codes
(160.3900) Materials : Metals
(160.4760) Materials : Optical properties
(160.4236) Materials : Nanomaterials
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Materials

History
Original Manuscript: May 8, 2008
Manuscript Accepted: June 10, 2008
Published: July 30, 2008

Citation
O. Peña, U. Pal, L. Rodríguez-Fernández, and A. Crespo-Sosa, "Linear optical response of metallic nanoshells in different dielectric media," J. Opt. Soc. Am. B 25, 1371-1379 (2008)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-25-8-1371

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