Resonant Tunneling and the Optical Response of Conjugated Molecules

Conjugated molecules are promising organic materials for photonic switching applications because of their potentially large nonresonant nonlinear response due to the easy delocalization of the -Ï€ electrons along their backbone. In addition, the ability to process these molecules into thin films on various substrates presents a major advantage from a device engineering standpoint. To design new compounds, an accurate estimate of the molecular length at which the optical response saturates is needed. We have shown1, that treating a conjugated molecule as a set of adequately coupled quantum oscillators leads to a strikingly good description of the experimentally observed length dependencies. This model is suitable for the study of the scaling laws, the effect of conformation, and of excited-state enhancement on the optical response.

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