Temperature changes of the optical properties of (SiO2) n , (GaAs) m , and (SiO2) n (GaAs) m nanoparticles: Computer experiment

Abstract

The optical properties of silicon dioxide and gallium arsenide nanoparticles and the four component particles based on them were calculated by the molecular dynamics method. The complex dielectric permittiv ity, infrared and Raman spectra, refractive index, and absorption coefficient of these nano particles were deter mined. The temperature dependences of the infrared and Raman spectra and the number of the optically active electrons in the nanoparticles composed of a semiconductor and/or a dielectric were investigated.

A review on determining the refractive index function, thermal accommodation coefficient and evaporation temperature of light-absorbing nanoparticles suspended in the gas phase using the laser-induced incandescence

“…The final value of E(m) could be determined from expressions (11) and (13) by fitting the data of the two above-mentioned methods of the particle heat-up temperature determination. This method requires the refractive index function wavelength dependence, which is typically unknown for NPs and should be measured or assumed [see Equations (11) and (12)]. Thus, the E(m) wavelength dependence is the main uncertainty of the absolute value of E(m) measurements using pulsed laser heating.…”

“…With decreasing NP size, the quantum effects might occur related to the electron zone variation and to the occurrence of the separated electron levels, which should inevitably influence electrical conductivity and optical properties. Despite much progress in the calculation technique, such as the molecular dynamics method that can predict the optical properties of the nano-objects [12], direct experimental measurements are, in our opinion, the highest priority. A comparison of the experimental and calculated data makes it possible to analyze the adequacy of the engaged models and to develop new calculation approaches.…”