Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy

N. Yamamoto, F. Javier García de Abajo, V. Myroshnychenko, Physical Review B 91 (2015).

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Abstract
We investigate the interplay between geometrical lattice resonances and surface plasmons mediating the emission of Smith-Purcell visible light via angle-resolved cathodoluminescence spectroscopy. We observe strong modulations in the dispersion curves of Smith-Purcell radiation (SPR) when they intersect the surface plasmons of silver gratings using a 200-kV transmission electron microscope. The decay of the plasmons away from the grating is directly probed by controlling the electron-beam position relative to the sample surface with nanometer precision. Our measurements are in excellent agreement with numerical simulations, clearly revealing the presence of characteristic Fano profiles resulting from the interference of the light continuum and the discrete plasmon states for each direction of emission. The intensity anomaly in the SPR emission pattern can be well explained from the geometrical consideration of the intersections between the dispersion planes of the SPR and surface plasmon polariton (SPP). A strong and directional SPR beam can be realized under the condition that the SPR dispersion plane comes in contact with the band edge of the SPP dispersion plane.
Publishing Year
Journal Title
Physical Review B
Volume
91
Issue
12
Article Number
125144
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Yamamoto N, Javier García de Abajo F, Myroshnychenko V. Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy. Physical Review B. 2015;91(12). doi:10.1103/physrevb.91.125144
Yamamoto, N., Javier García de Abajo, F., & Myroshnychenko, V. (2015). Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy. Physical Review B, 91(12). https://doi.org/10.1103/physrevb.91.125144
@article{Yamamoto_Javier García de Abajo_Myroshnychenko_2015, title={Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy}, volume={91}, DOI={10.1103/physrevb.91.125144}, number={12125144}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Yamamoto, Naoki and Javier García de Abajo, F. and Myroshnychenko, Viktor}, year={2015} }
Yamamoto, Naoki, F. Javier García de Abajo, and Viktor Myroshnychenko. “Interference of Surface Plasmons and Smith-Purcell Emission Probed by Angle-Resolved Cathodoluminescence Spectroscopy.” Physical Review B 91, no. 12 (2015). https://doi.org/10.1103/physrevb.91.125144.
N. Yamamoto, F. Javier García de Abajo, and V. Myroshnychenko, “Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy,” Physical Review B, vol. 91, no. 12, 2015.
Yamamoto, Naoki, et al. “Interference of Surface Plasmons and Smith-Purcell Emission Probed by Angle-Resolved Cathodoluminescence Spectroscopy.” Physical Review B, vol. 91, no. 12, 125144, American Physical Society (APS), 2015, doi:10.1103/physrevb.91.125144.
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