Phase disruption design rule
A topological defect or molecular side group produces a 'kink' or phase disruption in the wavefunction, producing a large nonlinear optical response. This breaks the donor-acceptor design paradigm, which has always produced molecules thirty times less responsive.
“Phase disruption as a new design paradigm for optimizing the nonlinear-optical response,” R. Lytel, SM Mossman, and MG Kuzyk, Optics Letters 40, 4735-4738 (2015).
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