Premium
Octupolar Molecules for Nonlinear Optics: From Molecular Design to Crystals and Films with Large Second‐Harmonic Generation
Author(s) -
Jeong MiYun,
Cho Bong Rae
Publication year - 2015
Publication title -
the chemical record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.61
H-Index - 78
eISSN - 1528-0691
pISSN - 1527-8999
DOI - 10.1002/tcr.201402013
Subject(s) - second harmonic generation , nonlinear optics , molecule , surface second harmonic generation , nonlinear optical , optics , materials science , nonlinear system , high harmonic generation , harmonic , optoelectronics , nanotechnology , molecular physics , physics , quantum mechanics , laser
We summarize the nonlinear optical ( NLO ) properties of octupolar molecules, crystals, and films developed in our laboratory. We present the design strategy, structure–property relationship, and second‐order NLO properties of 1,3,5‐trinitro‐ and 1,3,5‐tricyano‐2,4,6‐tris( p ‐diethylaminostyryl)benzene ( TTB ) derivatives, TTB crystals, and films prepared by free‐casting TTB in poly(methyl methacrylate) ( PMMA ). The first hyperpolarizability of TTB was fivefold larger than that of the dipolar analogue. Moreover, the TTB crystal showed unprecedentedly large second‐harmonic generation ( SHG ). While TTB crystal films (20 wt% TTB/PMMA ) on various substrates showed appreciable SHG values, the cylinder film exhibited much larger SHG values and large electro‐optic ( EO ) coefficients. The large SHG values and EO coefficients, as well as the high thermal stability of the cylinder film, will make it a potential candidate for NLO device applications.