Open AccessExperimental observation of optical orientation of dipolar centers
Author(s) -
A. I. Grachev,
Ervin Nippolainen,
Alexei A. Kamshilin
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.15.011500
Subject(s) - dipole , materials science , polarization (electrochemistry) , optics , orientation (vector space) , photoconductivity , transition dipole moment , amplitude , crystal (programming language) , dichroism , molecular physics , optoelectronics , physics , chemistry , geometry , mathematics , quantum mechanics , computer science , programming language
We report discovery of recently predicted phenomenon, optical orientation by polar way of local centers with permanent dipole moment. In a crystal of Bi(12)SiO(20) grown in the argon atmosphere electrical current arises when the polarization of incident light is periodically modulated. Dependence of the current amplitude on the modulation frequency allows us to attribute this current to the predicted effect, which is supported by the data on light-induced dichroism and photoconductivity of the sample. A model of donor-acceptor pairs as dipolar centers is shown to be able to explain main peculiarities of optical orientation of dipolar centers in the crystal.