Lap-Tak Cheng

TL;DR: A two-state, four-orbital, independent electron analysis of the first optical molecular hyperpolarizability, β, leads to the prediction that |β| maximizes at a combination of donor and acceptor strengths for a given conjugated bridge.

TL;DR: In this paper, the design strategies demonstrated in chromophores that when incorporated into poled-polymer electrooptic modulators exhibited significant enhancements in electro-optic coefficients relative to polymers containing the commonly used dye Disperse Red-1.

TL;DR: In this paper, it was suggested that the first hyperpolarizability of donor-acceptor polyenes can be maximized when an optimal degree of mixing between neutral and charge-separated canonical resonance forms is obtained.

TL;DR: In this article, a simplified three-level model for the molecular third-order nonlinear optical susceptibility is presented and discussed, and the perturbation theory-based approach suggests that there are three primary avenues to optimize molecular four-wave mixing susceptibilities and that with each of these is associated a particular class of molecular electronic structures.

TL;DR: In this paper, a series of donor-acceptor acetylene compounds were synthesized in which systematic changes in both the conjugation length and the donor acceptor strength were made, and the effect of these structural changes on the spectroscopic and electronic properties of the molecules and ultimately on the measured second-order molecular hyperpolarizabilities (beta) was investigated.