title: Synthesis of organic salts with large second-order optical nonlinearities.
abstract: A series of organic salts, in which the cation has been designed to have a large molecular hyperpolarizability, has been prepared. Variation of the counterion (anion) in many cases leads to materials with large powder second harmonic generation efficiencies, the highest of which is roughly 1000 times that of a urea reference.
authors.forename: S R
authors.initials: SR
authors.lastname: Marder
authors.forename: J W
authors.initials: JW
authors.lastname: Perry
authors.forename: W P
authors.initials: WP
authors.lastname: Schaefer