Inverse-Designed Narrowband THz Radiator for Ultrarelativistic Electrons

Hermann B, Häusler U, Yadav G, Kirchner A, Feurer T, Welsch C, Hommelhoff P, Ischebeck R (2022)

Publication Language: English

Publication Type: Journal article

Publication year: 2022

Journal

ACS Photonics American Chemical Society

URI: https://pubs.acs.org/doi/10.1021/acsphotonics.1c01932

DOI: 10.1021/acsphotonics.1c01932

Abstract

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.

Authors with CRIS profile

Adrian Kirchner Lehrstuhl für Laserphysik Peter Hommelhoff Lehrstuhl für Laserphysik

Involved external institutions

The University of Liverpool GB United Kingdom (GB) Paul Scherrer Institute (PSI) CH Switzerland (CH) Universität Bern CH Switzerland (CH)

How to cite

APA:

Hermann, B., Häusler, U., Yadav, G., Kirchner, A., Feurer, T., Welsch, C.,... Ischebeck, R. (2022). Inverse-Designed Narrowband THz Radiator for Ultrarelativistic Electrons. ACS Photonics. https://doi.org/10.1021/acsphotonics.1c01932

MLA:

Hermann, Benedikt, et al. "Inverse-Designed Narrowband THz Radiator for Ultrarelativistic Electrons." ACS Photonics (2022).

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