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Third-Order Nonlinear Optical Properties and Electroabsorption Spectra of an Organic Biradical, [Naphtho[2,1‑d:6,5‑d′]bis([1,2,3]dithiazole)]
journal contribution
posted on 2014-02-27, 00:00 authored by Keigo Takauji, Rie Suizu, Kunio Awaga, Hideo Kishida, Arao NakamuraThin
films of a thiazyl biradical, naphtho[2,1-d:6,5-d′]bis([1,2,3]dithiazole), abbreviated as NT, exhibit
nonlinear optical properties with a large third-order nonlinear susceptibility
of 2.1 × 10–11 esu. The electroabsorption and
low-temperature-absorption measurements reveal a series of degenerate
electronic states, which is probably caused by the biradical character
of NT. It is concluded that this degeneracy should enhance the third-order
nonlinear optical properties.