Open AccessSecond–harmonic generation in poled polymers: pre–poling history paradigm
Author(s) -
Grzegorz Pawlik,
Ileana Rău,
F. Kajzar,
Antoni C. Mituś
Publication year - 2010
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.18.018793
Subject(s) - poling , second harmonic generation , diagonal , electric field , materials science , dipole , monte carlo method , harmonic , optics , tensor (intrinsic definition) , molecular physics , nonlinear optics , polar , phase (matter) , condensed matter physics , physics , optoelectronics , quantum mechanics , dielectric , ferroelectricity , laser , statistics , geometry , mathematics , pure mathematics
Experimental studies of second harmonic generation (SHG) from electric-field poled PMMA - DR1 system show occurrence of a maximum in diagonal and off diagonal tensor components χ(2)(-2ω;ω,ω) at 15 mol % concentration and a rapid decrease above, with a stabilization. The origin of the observed concentration dependence is studied using the Monte Carlo (MC) modeling. We find that presence of maximum is conditioned by the pre-poling history of the sample, when entanglement of linear dipolar structures takes place. Length of the pre-poling interval is an important kinetic parameter which differentiates between various nonexponential kinetics of build-up of polar phase responsible for strong/weak SHG susceptibility.