Anomalous optical nonlinearity of dielectric nanodispersions

Journal Article · Sun Jun 30 00:00:00 EDT 2013 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2013V043N06ABEH015171· OSTI ID:22122910

Milichko, V A; Dzyuba, V P; Kul'chin, Yurii N

We present the results of studying the nonlinear optical response of nanodispersions of semiconductor (TiO{sub 2}, ZnO) and dielectric (SiO{sub 2}, Al{sub 2}O{sub 3}) nanoparticles of spherical, spheroidal and flake shape, suspended in polar and nonpolar dielectric matrices (water, isopropanol, polymethylsiloxane and transformer oil) by means of z-scanning in the field of low-intensity visible laser radiation. It is found that, unlike semiconductor nanoparticles and particles of spherical shape, flake-shaped SiO{sub 2} and Al{sub 2}O{sub 3} nanoparticles suspended in nonpolar matrices exhibit nonlinear optical response within the intensity interval from 0 to 500 W cm{sup -2} that vanishes at higher intensities. The diagrams of energy states of the optical electrons in nanoparticles that allow explanation of differences in the nonlinear-optical properties of nanodispersions are proposed. Good agreement between the experimental and theoretical dependences of nonlinear refractive indices and absorption coefficients on the intensity of radiation is observed. (optical nanostructures)

• OSTI ID: 22122910
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 43, Issue 6; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
ALUMINIUM OXIDES
DIELECTRIC MATERIALS
ELECTRONS
INSULATING OILS
LASER RADIATION
NANOSTRUCTURES
NONLINEAR OPTICS
PARTICLES
PROPANOLS
REFRACTIVE INDEX
SEMICONDUCTOR MATERIALS
SILICON OXIDES
SPHERICAL CONFIGURATION
TITANIUM OXIDES
WATER
ZINC OXIDES