Use este identificador para citar ou linkar para este item: http://hdl.handle.net/1843/43619
Tipo: Artigo de Periódico
Título: Plasmon-tunable tip pyramids: monopole nanoantennas for near-field scanning optical microscopy
Autor(es): Thiago de Lourenço e Vasconcelos
Bráulio Soares Archanjo
Cassiano Rabelo e Silva
Carlos Alberto Achete
Ado Jorio de Vasconcelos
Luiz Gustavo de Oliveira Lopes Cançado
Bruno Santos de Oliveira
Rogério Valaski
Rafael Cavalcante Cordeiro
Helton Gonçalves de Medeiros
Aroldo Ribeiro Lopes Neto
Peter Ercius
Resumo: Squeezing optical fields into nanometer scale is the key step to perform spatially resolved near-field optics. In scattering-type near-field optical microscopy, this task is accomplished by nanoantennas that convert propagating radiation to local near-fields and vice versa. The usual nanoantenna is composed by an elongated metal structure whose longitudinal dimension is scaled to support dipole modes of localized surface plasmon resonances. However, monopole modes can also be explored if the elongated metal nanoparticle is electrically grounded on a flat metallic plateau that acts like a mirror providing the monopole's image that closes the dipole system. Here, a method for batch production of monopole nanoantennas for scattering-type near-field scanning optical microscopy is presented. The nanoantennas are composed of a micropyramidal body with a nanopyramidal end whose lateral dimension can be scaled to fine-tune localized surface plasmon resonance modes. The monopole character of the nanoantennas is revealed by electron energy loss spectroscopy, and their efficiency and reproducibility are tested in tip-enhanced Raman spectroscopy experiments performed on single-layer graphene and single-walled carbon nanotubes.
Assunto: Plasmons
Microscopia ótica
Espectroscopia de Raman
Idioma: eng
País: Brasil
Editor: Universidade Federal de Minas Gerais
Sigla da Instituição: UFMG
Departamento: ICX - DEPARTAMENTO DE FÍSICA
Tipo de Acesso: Acesso Restrito
Identificador DOI: https://doi.org/10.1002/adom.201800528
URI: http://hdl.handle.net/1843/43619
Data do documento: 2018
metadata.dc.url.externa: https://onlinelibrary.wiley.com/doi/full/10.1002/adom.201800528
metadata.dc.relation.ispartof: Advanced Optical Materials
Aparece nas coleções:Artigo de Periódico

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