Monochromatic X-ray Source Based on Scattering from a Magnetic Nanoundulator
Author(s)Fisher, Sophie; Roques-Carmes, Charles; Rivera, Nicholas H.; Wong, Liang Jie; Kaminer, Ido; Soljacic, Marin; ... Show more Show less
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We present a novel design for an ultracompact, passive light source capable of generating ultraviolet and X-ray radiation, based on the interaction of free electrons with the magnetic near-field of a ferromagnet. Our design is motivated by recent advances in the fabrication of nanostructures, which allow the confinement of large magnetic fields at the surface of ferromagnetic nanogratings. Using ab initio simulations and a complementary analytical theory, we show that highly directional, tunable, monochromatic radiation at high frequencies could be produced from relatively low-energy electrons within a tabletop design. The output frequency is tunable in the extreme ultraviolet to hard X-ray range via electron kinetic energies from 1 keV to 5 MeV and nanograting periods from 1 μm to 5 nm. The proposed radiation source can achieve the tunability and monochromaticity of current free-electron-driven sources (free-electron lasers, synchrotrons, and laser-driven undulators), yet with a significantly reduced scale, cost, and complexity. Our design could help realize the next generation of tabletop or on-chip X-ray sources.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics
American Chemical Society (ACS)
Fisher, Sophie et al. "Monochromatic X-ray Source Based on Scattering from a Magnetic Nanoundulator." ACS Photonics 7, 5 (April 2020): 1096–1103 © 2020 American Chemical Society
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