6533b834fe1ef96bd129d4e1
RESEARCH PRODUCT
Enhanced nonlinear optical properties and thermal stability of donor-acceptor substituted oligothiophenes
Peter KrämerFranz EffenbergerFelix SteybeChristoph GlaniaRüdiger WortmannStefan Dr Beckmannsubject
ChemistryGeneral Physics and AstronomySecond-harmonic generationMolecular physicsAcceptorCondensed Matter::Materials ScienceNonlinear systemDipoleNonlinear opticalComputational chemistryElectric fieldThermal stabilityPhysics::Chemical PhysicsPhysical and Theoretical ChemistryAbsorption (electromagnetic radiation)description
Abstract Linear and nonlinear optical properties of a series of novel donor-acceptor substituted α-oligothiophenes were investigated by means of electrooptical absorption measurements (EOAM) and electric field induced second harmonic generation (EFISH). The second-order polarizabilities β(−2ω; ω, ω) were related to dipole changes Δμ ag and transition dipoles μ ag associated with low-lying charge-transfer (CT) excitations by using the perturbational two-level approximation. Systematic variation of the donor and acceptor groups led to compounds with exceptional nonlinearity and thermal stability. Too strong donor/acceptor pairs, however, yielded structures in the charge-resonance (CR) limit with small or vanishing Δμ ag and β .
year | journal | country | edition | language |
---|---|---|---|---|
1997-07-01 | Chemical Physics |