Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/44026
Type: Artigo de Periódico
Title: Impact of substrate on Tip-Enhanced Raman Spectroscopy: a comparison between field-distribution simulations and graphene measurements
Authors: Hudson Luiz Silva de Miranda
Ado Jorio de Vasconcelos
Cassiano Rabelo e Silva
Luiz Gustavo de Oliveira Lopes Cançado
Thiago de Lourenço e Vasconcelos
Bruno Santos de Oliveira
Florian Schulz
Holger Lange
Stephanie Reich
Patryk Kusch
Abstract: Tip-enhanced Raman spectroscopy (TERS) has reached nanometer spatial resolution for measurements performed at ambient conditions and subnanometer resolution at ultrahigh vacuum. Super-resolution (beyond the tip apex diameter) TERS has been obtained mostly in the gap mode configuration, where a conductive substrate localizes the electric fields. Here we present experimental and theoretical TERS to explore the field distribution responsible for spectral enhancement. We use gold tips of 40 ± 10 nm apex diameter to measure TERS on graphene, a spatially delocalized two-dimensional sample, sitting on different substrates: (i) glass, (ii) a thin layer of gold and (iii) a surface covered with 12 nm diameter gold spheres, for which 6 nm resolution is achieved at ambient conditions. The super-resolution is due to the field configuration resulting from the coupled tip-sample-substrate system, exhibiting a nontrivial spatial surface distribution. The field distribution and the symmetry selection rules are different for nongap versus gap mode configurations. This influences the overall enhancement which depends on the Raman mode symmetry and substrate structure.
Subject: Espectroscopia de Raman
Grafeno
language: eng
metadata.dc.publisher.country: Brasil
Publisher: Universidade Federal de Minas Gerais
Publisher Initials: UFMG
metadata.dc.publisher.department: ENG - DEPARTAMENTO DE ENGENHARIA ELÉTRICA
ICX - DEPARTAMENTO DE FÍSICA
Rights: Acesso Aberto
metadata.dc.identifier.doi: https://doi.org/10.1103/PhysRevResearch.2.023408
URI: http://hdl.handle.net/1843/44026
Issue Date: 29-Jun-2020
metadata.dc.url.externa: https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.023408
metadata.dc.relation.ispartof: Physical Review Research
Appears in Collections:Artigo de Periódico

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