Studies of the contribution of light scattering and absorption by inclusions of aluminum nanoparticlese in PETN

A method of an integrating sphere is used to study the optical characteristics of PETN containing 0.1% of aluminum inclusions with a particle size of $\approx$ 100 nm, depending on the concentration of inclusions and sample thickness. The study is carried out by using a stationary light source with a wavelength of 643 nm and a pulsed neodymium laser with a pulse duration of 14 ns. The extinction coefficients are calculated. It is concluded from the experimental results that light is absorbed by particles with the formation of “hot spots,” while an increase in the path of photons in the matrix due to scattering at inclusions and an increase in the possibility of light absorption by the PETN matrix are secondary phenomena.