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Title: Unraveling the mechanism of tip-enhanced molecular energy transfer

Journal Article · · Communications Chemistry
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Univ. degli Studi di Padova (Italy); Univ. of Southern California, Los Angeles, CA (United States); OSTI
  2. Univ. degli Studi di Padova (Italy)
  3. Univ. of Southern California, Los Angeles, CA (United States); CNR Institute of Nanoscience, Modena (Italy)
  4. Univ. degli Studi di Padova (Italy); CNR Institute of Nanoscience, Modena (Italy)

Electronic Energy Transfer (EET) between chromophores is fundamental in many natural light-harvesting complexes, serving as a critical step for solar energy funneling in photosynthetic plants and bacteria. The complicated role of the environment in mediating this process in natural architectures has been addressed by recent scanning tunneling microscope experiments involving EET between two molecules supported on a solid substrate. These measurements demonstrated that EET in such conditions has peculiar features, such as a steep dependence on the donor-acceptor distance, reminiscent of a short-range mechanism more than of a Förster-like process. By using state of the art hybrid ab initio/electromagnetic modeling, here we provide a comprehensive theoretical analysis of tip-enhanced EET. In particular, we show that this process can be understood as a complex interplay of electromagnetic-based molecular plasmonic processes, whose result may effectively mimic short range effects. Therefore, the established identification of an exponential decay with Dexter-like effects does not hold for tip-enhanced EET, and accurate electromagnetic modeling is needed to identify the EET mechanism.

Research Organization:
Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); European Union's Horizon 2020; Defense Advanced Research Projects Agency (DARPA)
Grant/Contract Number:
SC0019432
OSTI ID:
2472324
Journal Information:
Communications Chemistry, Journal Name: Communications Chemistry Journal Issue: 1 Vol. 7; ISSN 2399-3669
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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