Cooperative Enhancement of Two-Photon Absorption in Multi-branched Structures

Recent reports of molecular structures with considerably enhanced two-photon absorption cross-section have generated considerable interest in this phenomenon from both fundamental and applications perspectives. In this letter, we report cooperative enhancement of two-photon absorption in multi-branc...

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Published in:The journal of physical chemistry. B 1999-12, Vol.103 (49), p.10741-10745
Main Authors: Chung, Sung-Jae, Kim, Kyoung-Soo, Lin, Tzu-Chau, He, Guang S, Swiatkiewicz, Jacek, Prasad, Paras N
Format: Article
Language:English
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Summary:Recent reports of molecular structures with considerably enhanced two-photon absorption cross-section have generated considerable interest in this phenomenon from both fundamental and applications perspectives. In this letter, we report cooperative enhancement of two-photon absorption in multi-branched structures which may lead to new design criteria for development of highly efficient two-photon materials. The multi-branched structures were synthesized using coupling of two and three two-photon active asymmetric donor−acceptor chromophores linked together by a common amine group. The two-photon cross-sections measured both with nanosecond and femtosecond pulses show that the value for the trimer is more than six times larger than that for the monomer, and not just three times larger as expected from the number density increase.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp992846z