Near-field transmission and reflection spectroscopy for revealing absorption and scattering characteristics of single silver nanoplates

Hidetoshi Mizobata, Seiju Hasegawa, Mamoru Tamura, Takuya Iida, Kohei Imura

Research output: Contribution to journalArticlepeer-review

Abstract

Near-field optical microscopy visualizes spatial characteristics of elementary excitations induced in metal nanostructures. However, the microscopy is not able to reveal the absorption and scattering characteristics of the object simultaneously. In this study, we demonstrate a method for revealing the absorption and scattering characteristics of silver nanoplate by using near-field transmission and reflection spectroscopy. Near-field transmission and reflection images show characteristic spatial features attributable to the excited plasmon modes. The near-field refection image near the resonance shows a reversed contrast depending on the observed wavelength. Near-field reflection spectra show unique positive and negative resonant features. We reveal that the optical characteristics and the wavelength dependency of the optical contrast originate from the scattering and absorption properties of the plasmons, with the aid of the electromagnetic simulations.

Original languageEnglish
Article number144703
JournalJournal of Chemical Physics
Volume153
Issue number14
DOIs
Publication statusPublished - 2020 Oct 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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