| Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 20, Number 1, 2024
Plasmonica Collection
|
|
|---|---|---|
| Article Number | 14 | |
| Number of page(s) | 4 | |
| DOI | https://doi.org/10.1051/jeos/2024012 | |
| Published online | 29 April 2024 | |
Short Communication
Germanium Fabry-Perot nanoresonators investigated by cathodoluminescence spectroscopy
1
Blackett Laboratory, Department of Physics, Imperial College London, Prince Consort Rd, London SW7 2BW, United Kingdom
2
Nano-optics and Biophotonics Group, Experimental Physics 5, Institute of Physics, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
3
L-NESS, Dipartimento di Fisica, Politecnico di Milano, Polo di Como, Via Anzani 42, 22100 Como, Italy
4
Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
* Corresponding author: paolo.biagioni@polimi.it
Received:
11
January
2024
Accepted:
16
March
2024
We report on the experimental investigation, by means of spatially-resolved cathodoluminescence spectroscopy, of rectangular all-dielectric Ge nanoantennas sustaining Fabry-Perot resonances. The combination of spatial and spectral resolution allows us to directly image the standing-wave pattern of the local density of optical states inside the nanoantennas, which is the fingerprint of the resonant Purcell contribution to the overall emission enhancement previously reported in the literature for the same structures. Our results confirm that the emission properties of Ge nanostructures can be effectively tuned by engineering the local density of optical states and that cathodoluminescence provides valuable information to experimentally address such modulation in their emission properties.
Key words: Dielectric nanoantennas / cathodoluminescence spectroscopy / Germanium
© The Author(s), published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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