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Plasmonic excitation and manipulation with an electron beam

Published online by Cambridge University Press:  15 August 2012

Ernst Jan R. Vesseur
Affiliation:
Caelux Corporation, Pasadena, CA; vesseur@amolf.nl
Javier Aizpurua
Affiliation:
Center for Materials Physics of the Spanish National Council for Scientific Research CSIC and DIPC, San Sebastian, Spain; aizpurua@ehu.es
Toon Coenen
Affiliation:
FOM Institute AMOLF, Amsterdam, The Netherlands; t.coenen@amolf.nl
Alejandro Reyes-Coronado
Affiliation:
Institute of Physics, Autonomous University of Puebla, Mexico; coronado@ifuap.buap.mx
Philip E. Batson
Affiliation:
Institute for Advanced Materials, Devices and Nanotechnology, Rutgers University; batson@physics.rutgers.edu
Albert Polman
Affiliation:
FOM Institute AMOLF, Amsterdam, The Netherlands; a.polman@amolf.nl
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Abstract

When an electron beam passes through or near a metal structure, it will excite surface plasmons, providing a unique way to access surface plasmon behavior at the nanoscale. An electron beam focused to nanometer dimensions thus functions as a point source that is able to probe the local plasmonic mode structure at deep-subwavelength resolution. In this article, we show how well-controlled coupling between an electron beam and surface plasmons, combined with a far-field detection system, allows characterization and manipulation of plasmons on a variety of plasmonic devices. By mapping the spatial profile of inelastic scattering to resonant modes, the dispersion and losses of surface plasmons are resolved. The technique further allows probing of the confinement of plasmons within cavities and measuring the angular emission profile of nanoantennas. The coupling of electrons to surface plasmons allows the use of the electron beam as a dipole emitter that can be positioned at will. The beam position thereby can select between modes with different symmetries. This effect can be used to exert forces on plasmonic structures on the nanometer length scale with great control.

Information

Type
Research Article
Copyright
Copyright © Materials Research Society 2012

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