Physical Review E
harmonic-generation, centrosymmetric material, Rayleigh-scattering, phase, molecules, tensor, sphere, media
Second-Second-harmonic generation (SHG) is studied in the magnetically aligned nematic phase of a bent-core liquid crystal (BCN) and compared to similar measurements made on a conventional rodlike (calamitic) nematic compound. The second-harmonic (SH) light detected from both materials is predominantly due to scattering and therefore incoherent. Results on the calamitic are consistent with a polarization induced by ordinary director fluctuations in the nematic phase. However, the SH scattering collected in the BCN exhibits a different temperature and angular dependence. We discuss how these differences could arise from the effects of short-range correlated, smectic-C-type molecular clusters, which have been detected in recent studies on various BCN materials.
Hong, Seung Ho; Williams, J. C.; Twieg, Robert J.; Jakli, Antal; Gleeson, Jim T.; Sprunt, Samuel N.; and Ellman, Brett (2010). Second-Harmonic Generation in a Bent-Core Nematic Liquid Crystal. Physical Review E 82(4). doi: 10.1103/PhysRevE.82.041710 Retrieved from http://digitalcommons.kent.edu/cpippubs/177