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Theoretical modeling of surface and tip-enhanced Raman spectroscopies
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.ORCID iD: 0000-0002-3282-0711
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.ORCID iD: 0000-0003-0007-0394
2017 (English)In: Wiley Interdisciplinary Reviews. Computational Molecular Science, ISSN 1759-0876, E-ISSN 1759-0884, Vol. 7, no 2, UNSP e1293Article, review/survey (Refereed) Published
Abstract [en]

Raman spectroscopy is a powerful technique in molecular science because of the ability of providing vibrational 'finger-print'. The developments of the surfaceenhanced Raman spectroscopy (SERS) and tip-enhanced Raman spectroscopy (TERS) have significantly improved the detection sensitivity and efficiency. However, they also introduce complications for the spectral assignments, for which advanced theoretical modeling has played an important role. Here we summarize some of our recent progresses for SERS and TERS, which generally combine both solid-state physics and quantum chemistry methods with two different schemes, namely the cluster model and the periodic boundary condition (PBC) model. In the cluster model, direct Raman spectra calculations are performed for the cluster taken from the accurate PBC structure. For PBC model, we have developed a quasianalytical approach that enables us to calculate the Raman spectra of entire system. Under the TERS condition, the non-uniformity of plasmonic field in real space can drastically alter the interaction between the molecule and the light. By taking into account the local distributions of the plasmonic field, a new interaction Hamiltonian is constructed and applied to model the super-high-resolution Raman images of a single molecule. It shows that the resonant Raman images reflect the transition density between ground and excited states, which are generally vibrational insensitive. The nonresonant Raman images, on the other hand, allow to visualize the atomic movement of individual vibrational modes in real space. The inclusion of non-uniformity of plasmonic field provides ample opportunities to discover new physics and new applications in the future. 

Place, publisher, year, edition, pages
WILEY , 2017. Vol. 7, no 2, UNSP e1293
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-206709DOI: 10.1002/wcms.1293ISI: 000399013100003ScopusID: 2-s2.0-85007367855OAI: oai:DiVA.org:kth-206709DiVA: diva2:1093523
Note

QC 20170508

Available from: 2017-05-08 Created: 2017-05-08 Last updated: 2017-05-08Bibliographically approved

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