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Nonlinear optical properties of a channel waveguide produced with crosslinkable ferroelectric liquid crystals
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2000 (Engelska)Ingår i: The European Physical Journal E Soft matter, ISSN 1292-8941, E-ISSN 1292-895X, Vol. 3, nr 3, s. 245-251Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A binary mixture of ferroelectric liquid crystals (FLCs) was used for the design of a channel waveguide. The FLCs possess two important functionalities: a chromophore with a high hyperpolarizability beta and photoreactive groups. The smectic liquid crystal is aligned in layers parallel to the glass plates in a sandwich geometry. This alignment offers several advantages, such as that moderate electric fields are sufficient to achieve a high degree of polar order. The arrangement was then permanently fixed by photopolymerization which yielded a polar network possessing a high thermal and mechanical stability which did not show any sign of degradation within the monitored period of several months. The linear and nonlinear optical properties have been measured and all four independent components of the nonlinear susceptibility tensor (d) over bar have been determined. The off-resonant d-coefficients are remarkably high and comparable to those of the best known inorganic materials. The alignment led to an inherent channel waveguide for p-polarized light without additional preparation steps. The photopolymerization did not induce scattering sites in the waveguide and the normalized losses were less than 2 dB/cm. The material offers a great potential for the design of nonlinear optical devices such as frequency doublers of low-power laser diodes.

Ort, förlag, år, upplaga, sidor
2000. Vol. 3, nr 3, s. 245-251
Nyckelord [en]
2nd-harmonic generation, spontaneous polarization, polymer plcp, susceptibilities, polysiloxanes
Identifikatorer
URN: urn:nbn:se:kth:diva-20273ISI: 000166297800005OAI: oai:DiVA.org:kth-20273DiVA, id: diva2:338967
Anmärkning
QC 20100525Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Hult, Anders

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