Tuning the acoustic frequency of a gold nanodisk through its adhesion layer

Wei-Shun Chang, Fangfang Wen, Debadi Chakraborty, Man-Nung Su, Yue Zhang, Bo Shuang, Peter Nordlander, John E. Sader, Naomi J. Halas and Stephan Link ()
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Wei-Shun Chang: Rice University
Fangfang Wen: Rice University
Debadi Chakraborty: School of Mathematics and Statistics, The University of Melbourne, Melbourne, Victoria 3010, Australia
Man-Nung Su: Rice University
Yue Zhang: Rice University
Bo Shuang: Rice University
Peter Nordlander: Rice University
John E. Sader: School of Mathematics and Statistics, The University of Melbourne, Melbourne, Victoria 3010, Australia
Naomi J. Halas: Rice University
Stephan Link: Rice University

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract To fabricate robust metallic nanostructures with top-down patterning methods such as electron-beam lithography, an initial nanometer-scale layer of a second metal is deposited to promote adhesion of the metal of interest. However, how this nanoscale layer affects the mechanical properties of the nanostructure and how adhesion layer thickness controls the binding strength to the substrate are still open questions. Here we use ultrafast laser pulses to impulsively launch acoustic phonons in single gold nanodisks with variable titanium layer thicknesses, and observe an increase in phonon frequencies as a thicker adhesion layer facilitates stronger binding to the glass substrate. In addition to an all-optical interrogation of nanoscale mechanical properties, our results show that the adhesion layer can be used to controllably modify the acoustic phonon modes of a gold nanodisk. This direct coupling between optically excited plasmon modes and phonon modes can be exploited for a variety of emerging optomechanical applications.

Date: 2015
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DOI: 10.1038/ncomms8022

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