TY - JOUR
T1 - Accounting for the local field when determining the dielectric loss spectra of metals in the region of the frequencies of volume, surface and localized plasmon oscillations
AU - Perova, Tatiana
AU - Shaganov, Igor
AU - Berwick, Kevin
N1 - Publisher Copyright:
© 2020 by the authors.
PY - 2020/2/1
Y1 - 2020/2/1
N2 - The optical constant of bulk metal is used to determine the dispersion of the local field under one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) confinement. 3D confinement, expressed as εmic2 ω3D corresponds to the dielectric loss spectra of spherical particles with a diameter, d, much less than the wavelength of the beam used to measure the spectrum (d << λ). Excellent agreement with the results of Mie theory and experimental data for solid colloids within alkali halide crystals was observed. The function expressed as εmic2 ω1D allows the measurement of spectral micro-characteristics in the frequency range of the longitudinal collective motion of the free electrons. This corresponds to the spectrum of dielectric losses of bulk plasma oscillations. The function εmic2 ω3D describes the spectra of the dielectric losses of surface plasma oscillations in thin metal films. It is shown that the peak positions of εmic2 ω3D, εmic2 ω2D and εmic2 ω1D spectra for simple metals, viz. alkali metals as well as Al, Be, Mg, Ga, In, Sn and Si, are in agreement with experimental results from electron-energy-loss spectroscopy and various optical techniques.
AB - The optical constant of bulk metal is used to determine the dispersion of the local field under one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) confinement. 3D confinement, expressed as εmic2 ω3D corresponds to the dielectric loss spectra of spherical particles with a diameter, d, much less than the wavelength of the beam used to measure the spectrum (d << λ). Excellent agreement with the results of Mie theory and experimental data for solid colloids within alkali halide crystals was observed. The function expressed as εmic2 ω1D allows the measurement of spectral micro-characteristics in the frequency range of the longitudinal collective motion of the free electrons. This corresponds to the spectrum of dielectric losses of bulk plasma oscillations. The function εmic2 ω3D describes the spectra of the dielectric losses of surface plasma oscillations in thin metal films. It is shown that the peak positions of εmic2 ω3D, εmic2 ω2D and εmic2 ω1D spectra for simple metals, viz. alkali metals as well as Al, Be, Mg, Ga, In, Sn and Si, are in agreement with experimental results from electron-energy-loss spectroscopy and various optical techniques.
KW - Dispersive local field approach
KW - Localized surface plasmons
KW - Metal nanoparticles
KW - Solid colloids
KW - Surface plasmons
KW - Volume plasmons
UR - http://www.scopus.com/inward/record.url?scp=85079680402&partnerID=8YFLogxK
U2 - 10.3390/ma13030631
DO - 10.3390/ma13030631
M3 - Article
SN - 1996-1944
VL - 13
JO - Materials
JF - Materials
IS - 3
M1 - 631
ER -