Abstract
The surface plasmon resonance effects in porous gold (por-Au) films—nanocomposite porous films containing an ensemble of disordered gold nanoparticles—have been investigated by modulation-polarization spectroscopy. Por-Au films have been obtained by pulsed laser deposition (using a direct particle flow from an erosion torch formed by a YAG:Nd3+ laser in argon). The spectral and angular dependences of the polarization difference ρ(λ, θ) of internal-reflection coefficients of s- and p-polarized radiation in the Kretschmann geometry and the spectral dependences of isotropic reflection angles at ρ(θ) = 0 are measured. Two types of surface plasmon resonance are found: one occurs on isolated nanoparticles (dipole and multipole modes), and the other is due to the dipole–dipole interaction of neighboring nanoparticles. The frequency of electron plasma oscillations for the nanoparticle ensemble and the frequencies and decay parameters of resonances are determined. Dispersion relations for the radiative and nonradiative modes are presented. The negative sign of the dispersion branch of nonradiative modes of dipole–dipole interaction is explained by the spatial dispersion of permittivity. The relationships between the formation conditions of the films, their structure, and established resonance parameters (determining the resonant-optical properties of films) are discussed.
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Original Russian Text © S.P. Rudenko, M.O. Stetsenko, I.M. Krishchenko, L.S. Maksimenko, E.B. Kaganovich, B.K. Serdega, 2016, published in Optika i Spektroskopiya, 2016, Vol. 120, No. 4, pp. 569–575.
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Rudenko, S.P., Stetsenko, M.O., Krishchenko, I.M. et al. Surface plasmons in porous gold films. Opt. Spectrosc. 120, 540–545 (2016). https://doi.org/10.1134/S0030400X16040202
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DOI: https://doi.org/10.1134/S0030400X16040202