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Chiral nonlinear optics in oxides, polymers and liquid crystals
H. J. Chang,우정원,Ahyoung Kim,Byoungchoo Park,Hideo Takezoe,김장주,J.S. Lee,S. H. Han 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.42
The linear electro-optic (EO) effect, a second order nonlinear optical process, has been studied in optically active material systems including Bi12SiO20 oxide (BSO oxide), side-chain poly-isocyanate polymer with Disperse-Red 1 doped, and bent-core chiral liquid crystals. In an isotropic BSO sample, the breaking of intrinsic centrosymmetry allowed the EO modulation of the refractive index under an external modulation eld. The superposition principle of optical activity and optical birefringence for the total phase shift was extended to the determination of the EO coecient in the BSO crystal. In the case of polymer and liquid crystal samples, electro-gyration (EG) effects were observed. Upon application of a Corona eld to a chiral birefringent polymeric slab waveguide lm, changes in the polarization rotation were observed due to nonlinear changes in the optical activity, as well as the birefringence. Moreover, in a mixture of bent-shaped molecules having both optical activity and birefringence, we investigated the strong intensity modulation related to the nonlinear optical responses of both the optical rotatory power and the birefringence. These results open the possibility of chiral EO modulation in nonlinear optically active material systems.
Ha, N Y,Han, S H,Jeon, D W,Jung, C-S,Park, Byoungchoo,Takezoe, Hideo,Wu, J W Published by the American Physical Society through 2005 Physical review. E, Statistical, nonlinear, and so Vol.72 No.3
<P>By adopting classical models of molecular chirality, contributions of the coupled-oscillator and helix natures to the chiral surface second-order susceptibilities are identified through introduction of a molecular orientational distribution. Experimentally, surface orientational distribution functions at interfaces of an isotropic chiral chitosan polymer film are determined from second harmonic generation measurement. The largest chiral component of surface nonlinear optical susceptibility is from the electric-magnetic coupling with dominant contribution from the helix nature of chitosan.</P>