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

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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.

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

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Publication details

The article was received on 16 Mar 2017, accepted on 28 Apr 2017 and first published on 05 May 2017


Article type: Communication
DOI: 10.1039/C7CP01693J
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Two-photon photoelectron emission microscopy for surface plasmon polaritons at the Au(111) surface decorated with alkanethiolate self-assembled monolayers

    K. Yamagiwa, M. Shibuta and A. Nakajima, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP01693J

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