Optical properties of plasmas, including dielectric constants, indices of refraction, and absorption coefficients, are determined from an average-atom point of view. Linear response of an average atom to an harmonic electric field leads to an averageatom version of the Kubo-Greenwood formula, which is used to calculate the frequencydependent electric conductivity of the plasma. The frequency-de...

Using a broadband through-transmission technique, the attenuation coefficient and phase velocity spectra have been measured for a set of multi-wall carbon nanotube (MWCNT)-nylon composites (from pure nylon to 20% MWCNT by weight) in the ultrasonic frequency band from 4 to 14 MHz. The samples were found to be effectively homogeneous on spatial scales from the low end of ultrasonic wavelengths in...

We calculate by molecular dynamics the optical functions of MgO in the far infrared region 100-1000 cm(-1), for pressures up to 40 GPa and temperatures up to 4000 K. An ab initio parametrized many-body force field is used to generate the trajectories. Infrared spectra are obtained from the time correlation of the polarization, and from Kramers-Kronig relations. The calculated spectra agree well...

This course describes the interaction of electromagnetic radiation in the “optical” part of the spectrum (microwaves, infrared visible, ultraviolet) with matter—metals, insulators, semiconductors, and superconductors. Topics covered include the following. 1. Maxwell’s equations and plane waves in matter. 2. The refractive index N and the complex dielectric function, . 3. Semiclassical theories ...

Holographic microscopy is an emerging biological technique that provides amplitude and quantitative phase imaging, though the contrast provided by many cell types and organelles is low, and until now no dyes were known that increased contrast. Here we show that the metallocorrole Ga(tpfc)(SO3)2, which has a strong Soret band absorption, increases contrast in both amplitude and phase and facilit...

Optical spectra were investigated in a spectral range of (300 - 700) nm for CuAlS2 single crystals. Transmission and wavelength modulated transmission demonstrated presence some impurity absorption bands the region optical transparency functions (real imaginary components dielectric function, refractive index extinction coefficient) have been calculated from reflection by means Kramers-Kronig r...

The new approach to the theoretical description of the thermal Casimir force between real metals is presented. It uses the plasma-like dielectric permittivity that takes into account the interband transitions of core electrons. This permittivity precisely satisfies the Kramers-Kronig relations. The respective Casimir entropy is positive and vanishes at zero temperature in accordance with the Ne...