Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10619107 | Synthetic Metals | 2005 | 5 Pages |
Abstract
The third-order optical nonlinearities of several naphthalocyanine derivatives were measured under resonant conditions by the femtosecond degenerate four-wave mixing (DFWM) technique. Temporal profiles of the DFWM signal were measured with a time resolution of 0.3 ps, and were found to consist of at least two components, the coherent instantaneous nonlinear response and the slow response with a decay time constant longer than several hundred picoseconds. The latter can be attributed to the long-lived excited state and molecular rotational relaxation. The electronic molecular hyperpolarizability, γe, was evaluated to be in the range (2.1-7.5) Ã 10â29 esu for these macrocycles, two orders of magnitude greater than the nonresonant values.
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Authors
Gang Fu, Takefumi Yoda, Kazuo Kasatani, Hiroaki Okamoto, Shunsuke Takenaka,