Open AccessLaser-induced photodynamic effects at silica nanocomposite based on cadmium sulphide quantum dots
Author(s) -
S. S. Voznesenskiy,
Alexander A. Sergeev,
Anna Galkina,
Yu. N. Kulchin,
Yu. A. Shchipunov,
И. В. Постнова
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.002105
Subject(s) - nanocomposite , materials science , quantum dot , laser , luminescence , cadmium sulfide , absorption (acoustics) , optics , nanoparticle , optoelectronics , nanotechnology , composite material , physics , metallurgy
In this paper we study the laser-induced modification of optical properties of nanocomposite based on cadmium sulphide quantum dots encapsulated into thiomalic acid shell which were embedded into a porous silica matrix. We found red shift of luminescence of the nanocomposite when exposed to laser radiation at λ = 405 nm. Using pump-probe method and Small-Angle X-ray Scattering technique it was found that laser radiation at λ = 405 nm also increases the absorption coefficient of the nanocomposite in 15 times due to agglomeration of quantum dots. The modification of absorption properties is fully reversible.