Open AccessSize dependent multiphoton absorption and refraction of CdSe nanoparticles
Author(s) -
Venkatram Nalla,
R. Sathyavathi,
D. Narayana Rao
Publication year - 2007
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.15.012258
Subject(s) - bohr radius , materials science , absorption (acoustics) , quantum dot , optics , nanoparticle , sapphire , two photon absorption , refraction , wavelength , nonlinear optics , cadmium selenide , z scan technique , laser , molecular physics , nanophotonics , optoelectronics , nanotechnology , physics
We report a systematic investigation on nonlinear optical properties of CdSe nanoparticles that are smaller as well as larger than the Bohr radius. Multiphoton absorption and nonlinear refraction properties of CdSe nanoparticles observed with 800nm wavelength and 110femtosecond Ti:Sapphire laser are presented. These nonlinear optical studies were undertaken by performing open and closed aperture Z-scan measurements. The four different sizes of CdSe nanoparticles investigated are 5nm, 10nm, 25nm and 400nm. Both the quantum dots 5nm, 10nm sizes (taking the literature value of 10.6nm as the Bohr exciton diameter) show four photon absorption (4PA), while the 25nm and 400nm show the three photon absorption (3PA) properties. All four sizes of CdSe nanoparticles show the positive nonlinear refraction (n2).