Imaging and controlling plasmonic interference fields at buried interfaces

Tom T. A. Lummen (), Raymond J. Lamb, Gabriele Berruto, Thomas LaGrange, Luca Dal Negro, F. Javier García de Abajo, Damien McGrouther, B. Barwick and F. Carbone ()
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Tom T. A. Lummen: Laboratory for Ultrafast Microscopy and Electron Scattering, ICMP, École Polytechnique Fédérale de Lausanne
Raymond J. Lamb: SUPA, School of Physics and Astronomy, University of Glasgow
Gabriele Berruto: Laboratory for Ultrafast Microscopy and Electron Scattering, ICMP, École Polytechnique Fédérale de Lausanne
Thomas LaGrange: Interdisciplinary Center for Electron Microscopy (CIME), École Polytechnique Fédérale de Lausanne
Luca Dal Negro: Boston University
F. Javier García de Abajo: ICFO – Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels
Damien McGrouther: SUPA, School of Physics and Astronomy, University of Glasgow
B. Barwick: Trinity College
F. Carbone: Laboratory for Ultrafast Microscopy and Electron Scattering, ICMP, École Polytechnique Fédérale de Lausanne

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Capturing and controlling plasmons at buried interfaces with nanometre and femtosecond resolution has yet to be achieved and is critical for next generation plasmonic devices. Here we use light to excite plasmonic interference patterns at a buried metal–dielectric interface in a nanostructured thin film. Plasmons are launched from a photoexcited array of nanocavities and their propagation is followed via photon-induced near-field electron microscopy (PINEM). The resulting movie directly captures the plasmon dynamics, allowing quantification of their group velocity at ∼0.3 times the speed of light, consistent with our theoretical predictions. Furthermore, we show that the light polarization and nanocavity design can be tailored to shape transient plasmonic gratings at the nanoscale. This work, demonstrating dynamical imaging with PINEM, paves the way for the femtosecond and nanometre visualization and control of plasmonic fields in advanced heterostructures based on novel two-dimensional materials such as graphene, MoS2, and ultrathin metal films.

Date: 2016
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DOI: 10.1038/ncomms13156

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