Free-electron crystals for enhanced X-ray radiation

Author:

Wong Lee Wei Wesley,Shi XihangORCID,Karnieli Aviv,Lim Jeremy,Kumar Suraj,Carbajo Sergio,Kaminer IdoORCID,Wong Liang JieORCID

Abstract

AbstractBremsstrahlung—the spontaneous emission of broadband radiation from free electrons that are deflected by atomic nuclei—contributes to the majority of X-rays emitted from X-ray tubes and used in applications ranging from medical imaging to semiconductor chip inspection. Here, we show that the bremsstrahlung intensity can be enhanced significantly—by more than three orders of magnitude—through shaping the electron wavefunction to periodically overlap with atoms in crystalline materials. Furthermore, we show how to shape the bremsstrahlung X-ray emission pattern into arbitrary angular emission profiles for purposes such as unidirectionality and multi-directionality. Importantly, we find that these enhancements and shaped emission profiles cannot be attributed solely to the spatial overlap between the electron probability distribution and the atomic centers, as predicted by the paraxial and non-recoil theory for free electron light emission. Our work highlights an unprecedented regime of free electron light emission where electron waveshaping provides multi-dimensional control over practical radiation processes like bremsstrahlung. Our results pave the way towards greater versatility in table-top X-ray sources and improved fundamental understanding of quantum electron-light interactions.

Funder

National Research Foundation Singapore

United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research

DOE | Advanced Research Projects Agency - Energy

United States-Israel Binational Science Foundation

Israel Science Foundation

Publisher

Springer Science and Business Media LLC

Reference114 articles.

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4. Kaminer, I. et al. Efficient plasmonic emission by the quantum Čerenkov effect from hot carriers in graphene. Nat. Commun. 7, ncomms11880 (2016).

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