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Numerical investigations on the electromagnetic enhancement effect to tip-enhanced Raman scattering and fluorescence processes
Yanshan Univ, Sch Sci, Key Lab Microstruct Mat Phys Hebei Prov, Qinhuangdao 066004, Hebei, Peoples R China..
Yanshan Univ, Coll Informat Sci & Engn, Qinhuangdao 066004, Hebei, Peoples R China..
Yanshan Univ, Sch Sci, Key Lab Microstruct Mat Phys Hebei Prov, Qinhuangdao 066004, Hebei, Peoples R China..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.ORCID iD: 0000-0002-3282-0711
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2019 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 31, no 23, article id 235301Article in journal (Refereed) Published
Abstract [en]

In the present work, we theoretically study the electromagnetic (EM) enhancement of the Raman and fluorescence signals for a molecule placed in a nanocavity formed by a metallic tip and substrate that mimics a tip-enhanced Raman scattering (TERS) setup using three-dimensional finite element method calculations. The influence of tip size and tip-molecule distance on the EM enhancements of the incident field as well as the radiative and non-radiative decay rates of the molecule are systematically investigated. Simulation results show that the maximum EM enhancement to the incident light as provided by the localized surface plasmon resonance in the nanocavity can reach similar to 285 for the configuration considered in the present work. Meanwhile, it was found that, at the classical limit, decreasing the apex radius or the tip-molecule distance can both reduce the spatial distribution (as characterized by the full width at half maximum) of the Raman enhancement in a linear fashion. Moreover, simulation results show that the nonlocal dielectric response of the tip and the substrate plays a key role to the fluorescence quantum yield of the molecule. However, it was found that the strong EM excitation enhancement is the dominating factor for the tip enhanced fluorescence (TEF) effect and stronger fluorescence enhancement has been found when increasing the apex radius or reducing the tip-molecule distance with an incident wavelength of 532 nm. The best TERS and TEF enhancements were found to be similar to 6 x 10(9) and similar to 1.7 x 10(4), respectively, with the tip-molecule distance around 1 nm.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 31, no 23, article id 235301
Keywords [en]
tip-enhanced Raman spectroscopy, tip-enhanced fluorescence, localized surface plasmon, spatial resolution
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-249759DOI: 10.1088/1361-648X/ab0b9dISI: 000463108200001PubMedID: 30818299Scopus ID: 2-s2.0-85064726108OAI: oai:DiVA.org:kth-249759DiVA, id: diva2:1307729
Note

QC 20190429

Available from: 2019-04-29 Created: 2019-04-29 Last updated: 2019-05-16Bibliographically approved

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