Enhanced phase-matched second-harmonic generation in a ferroelectric liquid crystal waveguide
2001 (English)In: Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, ISSN 1058-725X, Vol. 368, 4061-4070 p.Article in journal (Refereed) Published
A binary mixture of crosslinkable ferroelectric liquid crystals (FLCs) was used for the design of a channel waveguide. The liquid crystal was aligned in layers parallel to the glass plates (homeotropic) in a sandwich geometry and then the arrangement was permanently fixed by photopolymerization which yielded a polar network possessing a high thermal and mechanical stability. The linear and nonlinear optical properties have been measured and all four independent components of the nonlinear susceptibility tensor d have been determined. The off-resonant d-coefficients are remarkably high and comparable to those of the best known inorganic materials. Phase-matching was achieved by taking advantage of the modal dispersion of the waveguide. A reversal of sign of chi ((2)) at the nodal plane of the electric field distribution of the first-order mode was needed to maximize the overlap. integral between the fundamental and the second-harmonic (SH) light. In samples with chi ((2)) inversion the SH Signal was 1000 larger that in samples without chi ((2)) inversion.
Place, publisher, year, edition, pages
2001. Vol. 368, 4061-4070 p.
second-harmonic generation, phase-matching, chi((2)) inversion, crosslinkable ferroelectric liquid crystals, 2nd-order nonlinear optics, 2nd-harmonic generation, wave-guide, polymer, light
IdentifiersURN: urn:nbn:se:kth:diva-21069ISI: 000171900400035OAI: oai:DiVA.org:kth-21069DiVA: diva2:339766
QC 201005252010-08-102010-08-102016-05-27Bibliographically approved