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Sensitivity of metal nanoparticle surface plasmon resonance to the dielectric environment.
J Phys Chem B. 2005 Nov 24; 109(46):21556-65.JP

Abstract

Electrodynamic simulations of gold nanoparticle spectra were used to investigate the sensitivity of localized surface plasmon band position to the refractive index, n, of the medium for nanoparticles of various shapes and nanoshells of various structures. Among single-component nanoparticles less than 130 nm in size, sensitivities of dipole resonance positions to bulk refractive index are found to depend only upon the wavelength of the resonance and the dielectric properties of the metal and the medium. Among particle plasmons that peak in the frequency range where the real part of the metal dielectric function varies linearly with wavelength and the imaginary part is small and slowly varying, the sensitivity of the peak wavelength, lambda, to refractive index, n, is found to be a linearly increasing function of lambda, regardless of the structural features of the particle that determine lambda. Quasistatic theory is used to derive an analytical expression for the refractive index sensitivity of small particle plasmon peaks. Through this analysis, the dependence of sensitivity on band position is found to be determined by the wavelength dependence of the real part, epsilon', of the particle dielectric function, and the sensitivity results are found to extend to all particles with resonance conditions of the form, epsilon' = -2chin(2), where chi is a function of geometric parameters and other constants. The sensitivity results observed using accurate computational methods for dipolar plasmon bands of gold nanodisks, nanorods, and hollow nanoshells extend, therefore, to particles of other shapes (such as hexagonal and chopped tetrahedral), composed of other metals, and to higher-order modes. The bulk refractive index sensitivity yielded by the theory serves as an upper bound to sensitivities of nanoparticles on dielectric substrates and sensitivities of nanoparticles to local refractive index changes, such as those associated with biomolecule sensing.

Authors+Show Affiliations

Department of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, North Carolina 27708-0300, USA.No affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

16853799

Citation

Miller, Molly M., and Anne A. Lazarides. "Sensitivity of Metal Nanoparticle Surface Plasmon Resonance to the Dielectric Environment." The Journal of Physical Chemistry. B, vol. 109, no. 46, 2005, pp. 21556-65.
Miller MM, Lazarides AA. Sensitivity of metal nanoparticle surface plasmon resonance to the dielectric environment. J Phys Chem B. 2005;109(46):21556-65.
Miller, M. M., & Lazarides, A. A. (2005). Sensitivity of metal nanoparticle surface plasmon resonance to the dielectric environment. The Journal of Physical Chemistry. B, 109(46), 21556-65.
Miller MM, Lazarides AA. Sensitivity of Metal Nanoparticle Surface Plasmon Resonance to the Dielectric Environment. J Phys Chem B. 2005 Nov 24;109(46):21556-65. PubMed PMID: 16853799.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sensitivity of metal nanoparticle surface plasmon resonance to the dielectric environment. AU - Miller,Molly M, AU - Lazarides,Anne A, PY - 2006/7/21/pubmed PY - 2007/7/20/medline PY - 2006/7/21/entrez SP - 21556 EP - 65 JF - The journal of physical chemistry. B JO - J Phys Chem B VL - 109 IS - 46 N2 - Electrodynamic simulations of gold nanoparticle spectra were used to investigate the sensitivity of localized surface plasmon band position to the refractive index, n, of the medium for nanoparticles of various shapes and nanoshells of various structures. Among single-component nanoparticles less than 130 nm in size, sensitivities of dipole resonance positions to bulk refractive index are found to depend only upon the wavelength of the resonance and the dielectric properties of the metal and the medium. Among particle plasmons that peak in the frequency range where the real part of the metal dielectric function varies linearly with wavelength and the imaginary part is small and slowly varying, the sensitivity of the peak wavelength, lambda, to refractive index, n, is found to be a linearly increasing function of lambda, regardless of the structural features of the particle that determine lambda. Quasistatic theory is used to derive an analytical expression for the refractive index sensitivity of small particle plasmon peaks. Through this analysis, the dependence of sensitivity on band position is found to be determined by the wavelength dependence of the real part, epsilon', of the particle dielectric function, and the sensitivity results are found to extend to all particles with resonance conditions of the form, epsilon' = -2chin(2), where chi is a function of geometric parameters and other constants. The sensitivity results observed using accurate computational methods for dipolar plasmon bands of gold nanodisks, nanorods, and hollow nanoshells extend, therefore, to particles of other shapes (such as hexagonal and chopped tetrahedral), composed of other metals, and to higher-order modes. The bulk refractive index sensitivity yielded by the theory serves as an upper bound to sensitivities of nanoparticles on dielectric substrates and sensitivities of nanoparticles to local refractive index changes, such as those associated with biomolecule sensing. SN - 1520-6106 UR - https://www.unboundmedicine.com/medline/citation/16853799/Sensitivity_of_metal_nanoparticle_surface_plasmon_resonance_to_the_dielectric_environment_ L2 - https://doi.org/10.1021/jp054227y DB - PRIME DP - Unbound Medicine ER -