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Graphene Metamaterials for Intense, Tunable, and Compact Extreme Ultraviolet and X‐Ray Sources
Name
advs.201901609.pdf
Description
Published version
Size
1.15 MB
Format
Adobe PDF
Checksum (MD5)
d9246e094dbe0e95c15439289b7dd66d
Author(s)
Pizzi, Andrea
Rosolen, Gilles
Wong, Liang Jie
Ischebeck, Rasmus
Soljačić, Marin
Feurer, Thomas
Kaminer, Ido
Journal
Advanced Science
Publisher
Wiley
Version
Final published version
Abstract
© 2019 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The interaction of electrons with strong electromagnetic fields is fundamental to the ability to design high-quality radiation sources. At the core of all such sources is a tradeoff between compactness and higher output radiation intensities. Conventional photonic devices are limited in size by their operating wavelength, which helps compactness at the cost of a small interaction area. Here, plasmonic modes supported by multilayer graphene metamaterials are shown to provide a larger interaction area with the electron beam, while also tapping into the extreme confinement of graphene plasmons to generate high-frequency photons with relatively low-energy electrons available from tabletop sources. For 5 MeV electrons, a metamaterial of 50 layers and length 50 µm, and a beam current of 1.7 µA, it is, for instance, possible to generate X-rays of intensity 1.5 × 107 photons sr−1 s−1 1%BW, 580 times more than for a single-layer design. The frequency of the driving laser dynamically tunes the photon emission spectrum. This work demonstrates a unique free-electron light source, wherein the electron mean free path in a given material is longer than the device length, relaxing the requirements of complex electron beam systems and potentially paving the way to high-yield, compact, and tunable X-ray sources.
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
10.1002/ADVS.201901609
