Optical Properties of Nanoparticle Systems by Michael Quinten

By Michael Quinten

Filling the space for an outline of the optical homes of small debris with sizes under one thousand nm and to supply a accomplished review at the spectral habit of nanoparticulate subject, this can be the main up to date reference at the optical physics of nanoparticle platforms. the writer, knowledgeable within the box with either educational and business event, concentrates at the linear optical homes, elastic gentle scattering and absorption of unmarried nanoparticles and on reflectance and transmittance of nanoparticle topic.

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4 with the Kramers–Kronig relations a tool for the calculation of the imaginary part of the dielectric function from the real part and vice versa and discuss the penetration of light into different materials. 1 Classical Description The interaction of electromagnetic fields with matter is dominated by the forces exerted by the incident electric (and magnetic) field on the electric charges in the matter. At high frequencies, the electric field E inside the body of condensed matter usually displaces the electrons in the atoms of condensed matter while the ions are too inert as to follow the electric field with the same frequency.

3 Extinction, Optical Density, and Scattering Comparing the measured spectra with spectra computed for spherical particles, a mean particle size of 2R = 52 nm is obtained for the spherical particles, which is in agreement with the size 2R = 46 ± 6 nm obtained from evaluation of the TEM images. For the nonspherical particles, larger sizes of volume-equivalent spheres are obtained: 2R = 76 nm (sample 4), 80 nm (sample 3), 88 nm (sample 2), and 104 nm (sample 1). 1 Dilute Systems Coming back to the connection between the optical properties of nanoparticle systems and the optical properties of the embedded nanoparticles, we show the influence of increasing filling factor f on the optical absorption and scattering by the assembly in the case of low filling factors, when the Lambert–Beer law is applicable.

30 is proportional to the mass concentration or the filling factor, the optical density spectra of particle assemblies do not differ in shape from the spectra of single particles when the filling factor or the mass concentration is increased. 17 with computed transmittance spectra for silver nanoparticles with 2R = 20 and 50 nm dispersed in glass. The sample thickness is d = 1 mm. 14 × 10−3) for the larger particles. On increasing the concentration m/V the minimum in the transmittance at λ = 422 nm for 2R = 20 nm and at λ = 446 nm for 2R = 50 nm becomes deeper.

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