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Mapping Local Surface Plasmon Modes in a Nanoplasmonic Trimer Using Cathodoluminescence in the Scanning Electron Microscope

Published online by Cambridge University Press:  05 May 2020

Amelia C. Y. Liu ,
Julian Lloyd ,
Toon Coenen  and
Daniel E. Gómez
Amelia C. Y. Liu*
Affiliation:
School of Physics and Astronomy, Monash University, Clayton, VIC3800, Australia Monash Centre for Electron Microscopy, Monash University, Clayton, VIC3800, Australia
Julian Lloyd
Affiliation:
Department of Chemical Engineering, Monash University, Clayton, VIC3800, Australia
Toon Coenen
Affiliation:
DELMIC BV, Kanaalweg 4, 2628 EB, Delft, The Netherlands
Daniel E. Gómez
Affiliation:
School of Applied Science, RMIT University, Melbourne, VIC3000, Australia
*
*Author for correspondence: Amelia C. Y. Liu, E-mail: [email protected]
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Abstract

The excitability of local surface plasmon modes in radial trimers composed of gold nanorods was mapped using hyperspectral cathodoluminescence (CL) in the scanning electron microscope. In symmetric trimers, the local plasmon resonances could be excited most effectively at the ends of individual rods. Introducing asymmetry into the structure breaks the degeneracy of the dipole modes and changes the excitability of transverse dipole modes in different directions. CL in the scanning electron microscope has great potential to interrogate individual nanophotonic structures and is a complement to electron energy loss spectroscopy and optical microscopy.

Keywords

cathodoluminescencelocal surface plasmon modenanoplasmonic trimerscanning electron microscope
Type
Australian Microbeam Analysis Society Special Section AMAS XV 2019
Information
Microscopy and Microanalysis , Volume 26 , Issue 4 , August 2020 , pp. 808 - 813
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Copyright
Copyright © Microscopy Society of America 2020

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