A series of unconventional twisted intramolecular charge-transfer (TICT) chromophores was designed and synthesized. These chromophores exhibit ultra-large first hyperpolarizabilities. The structural characteristic that promotes this unusual nonlinear optical response is a sterochemically enforced reduction of the D-π-A conjugation that enforces zwitterionic behavior in the ground state and provides a low-energy, large-oscillator strength intramolecular excitation feature. The consequence is that molecules with relatively small numbers of π-electrons exhibit responses far larger than those of traditional planar π-conjugated chromophores. At 1907 nm, non-resonant μß values as high as -466,000 × 10-48 esu are observed.
|Original language||English (US)|
|Number of pages||6|
|Journal||Materials Research Society Symposium Proceedings|
|State||Published - Dec 1 2005|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials