Interband Transitions Are More Efficient Than Plasmonic Excitation in the Ultrafast Melting of Electromagnetically Coupled Au Nanoparticles
Source abstract
Abstract
We investigated the effects of ultrafast laser excitation of Au nanoparticles (NPs) having strong interparticle electromagnetic coupling by irradiating the NPs either at interband or plasmon-resonance wavelengths (13–100 J/m 2 fluence regime). We observed that interband excitation is significantly more efficient than plasmonic excitation in reshaping, coalescing, and ultimately sublimating the NPs, despite the light-absorption cross section of interband excitation being almost half that of plasmonic irradiation. We ascribed this to the different localizations of radiation-induced heat sources in the strongly coupled NPs in the two cases. Interband excitation induces homogeneous heat generation in Au, and so the conventional NP heating pathway is followed, eventually leading to overall melting, coalescence, and ablation of Au. Plasmonic irradiation, on the other hand, promotes strong localization of the heat sources within small energetic hot spots, a fact that we suggest may lead to nonthermal effects that melt and reshape the NPs only on the local scale, leaving the system otherwise relatively unscathed.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Laser-Ablation Synthesis of Nanoparticles · nanoparticles nucleation surface interactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
OptMatLab, Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, Genova I-16146, Italy
Cixi Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Istituto Italiano di Tecnologia, Via Morego 30, Genova 16163, Italy
CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma Tor Vergata, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy
CNR-ISM, Division of Ultrafast Processes in Materials (FLASHit), Area della Ricerca di Roma 1, Monterotondo Scalo I-00015, Italy
Department of Electrical and Computer Engineering, Rice University, Houston 77005, Texas, United States
CNR-SPIN, C.so Perrone 24, Genova I-16152, Italy
Funding
Ministero dell?Istruzione, dell?Universit? e della Ricerca · Compagnia di San Paolo
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