Inverse-Designed Narrowband THz Radiator for Ultrarelativistic Electrons.
American Chemical Society (ACS)
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Hermann, B., Haeusler, U., Yadav, G., Kirchner, A., Feurer, T., Welsch, C., Hommelhoff, P., & et al. (2022). Inverse-Designed Narrowband THz Radiator for Ultrarelativistic Electrons.. ACS Photonics, 9 (4), 1143-1149. https://doi.org/10.1021/acsphotonics.1c01932
THz radiation finds various applications in science and technology. Pump-probe experiments at free-electron lasers typically rely on THz radiation generated by optical rectification of ultrafast laser pulses in electro-optic crystals. A compact and cost-efficient alternative is offered by the Smith-Purcell effect: a charged particle beam passes a periodic structure and generates synchronous radiation. Here, we employ the technique of photonic inverse design to optimize a structure for Smith-Purcell radiation at a single wavelength from ultrarelativistic electrons. The resulting design is highly resonant and emits narrowbandly. Experiments with a 3D-printed model for a wavelength of 900 μm show coherent enhancement. The versatility of inverse design offers a simple adaption of the structure to other electron energies or radiation wavelengths. This approach could advance beam-based THz generation for a wide range of applications.
European Research Council (884217)
External DOI: https://doi.org/10.1021/acsphotonics.1c01932
This record's URL: https://www.repository.cam.ac.uk/handle/1810/337612
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: https://creativecommons.org/licenses/by-nc-nd/4.0/