Optical second harmonic generation in a ferromagnetic liquid crystal

Second-harmonic generation in a bent-core nematic liquid crystal.

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 polarizat...

Second-harmonic light generation in pyroelectric liquid-crystal polymers

Pyroelectric liquid-crystal polymers were prepared by photopolymerization of binary mixtures of two monomers that exhibit a smectic C* phase: A2c, 49-$(R)-(2)-2-[(10-acryloyloxy)decyl]oxy%-3-nitrophenyl 4-{48[(11-acryloyloxy)undecyloxy]phenyl%benzoate and A1b, 49-((R)-(1)-2-octyloxy)-39-nitro phenyl 4-(48-@(11acryloyloxy)undecyloxy]phenyl) benzoate. Both liquid-crystal monomers have a NO2 subst...

Electric field-induced optical second harmonic generation in nematic liquid crystal 5CB

Electric field-induced second harmonic generation (EFISH) was studied for the liquid crystal 4-cyano-4'-pentylbiphenyl (5CB) (a nematic phase material at room temperature). The intensity of coherent SHG from 5CB cells upon DC electric field was measured for various initial orientations of the liquid crystal. The dependence of the SHG intensity on the pump beam incidence angle was obtained in tr...

Second harmonic generation in a photonic crystal

Atomically phase-matched second-harmonic generation in a 2D crystal

Second-harmonic generation (SHG) has found extensive applications from hand-held laser pointers to spectroscopic and microscopic techniques. Recently, some cleavable van der Waals (vdW) crystals have shown SHG arising from a single atomic layer, where the SH light elucidated important information such as the grain boundaries and electronic structure in these ultra-thin materials. However, despi...