Mapping Local Surface Plasmon Modes in a Nanoplasmonic Trimer Using Cathodoluminescence in the Scanning Electron Microscope
Amelia CY Liu, Julian Lloyd, Toon Coenen, Daniel E Gomez
MICROSCOPY AND MICROANALYSIS | CAMBRIDGE UNIV PRESS | Published : 2020
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.
Awarded by Monash Centre for Electron Microscopy
Awarded by ARC
The authors acknowledge the use of facilities in the Monash Centre for Electron Microscopy (ARC LE140100104). This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). We thank Albert Polman, Benjamin Brenny, Daan Van Oosten Slingeland, Matthew Phillips, Marion Stevens-Kalceff, Joanne Etheridge, Alison Funston, and Tim Davis for many stimulating discussions. D.E.G. and A.C.Y.L. acknowledge the ARC for support (FT140100514 and FT180100594). D.E.G. acknowledges ANFF for an MCN Technology Fellowship.