Two-photon photoelectron emission microscopy for surface plasmon polaritons at the Au(111) surface decorated with alkanethiolate self-assembled monolayers

Kana Yamagiwa, Masahiro Shibuta, Atsushi Nakajima

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this study, we have employed dual-color photoelectron emission microscopy (2P-PEEM) to visualize surface plasmon polaritons (SPPs) propagating along a chemically modified organic/metal interface of alkanethiolate self-assembled monolayers (Cn-SAMs; n is the number of alkyl carbon atoms) formed on Au(111). In dual-color 2P-PEEM, near-infrared photons around 900 nm generate SPPs at the Cn-SAMs/Au(111) interface, which interfere with the remaining light field. The resulting surface polarization beats are imaged as local distributions of 2P-photoelectrons probed by ultraviolet photons. Through dual-color 2P-PEEM for various alkyl chain lengths of Cn-SAMs, it is revealed that SPP properties are largely modified by an interfacial electronic state, particularly formed by the chemical interaction between surface Au atoms and adsorbate thiol molecules, thereby allowing the quantification of their group velocity at ∼0.86 times the speed of light. Since the SPP properties are controllable in terms of their height as organic dielectric layers, a bottom-up tailored technique using SAMs exhibits designer capability in adjusting the dielectric properties toward applications in surface plasmonic devices.

Original languageEnglish
Pages (from-to)13455-13461
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume19
Issue number21
DOIs
Publication statusPublished - 2017

ASJC Scopus subject areas

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

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