Hermann, Benedikt, Haeusler, Urs, Yadav, Gyanendra, Kirchner, Adrian, Feurer, Thomas, Welsch, Carsten 
ORCID: 0000-0001-7085-0973, Hommelhoff, Peter and Ischebeck, Rasmus
(2022)
Inverse-Designed Narrowband THz Radiator for Ultrarelativistic Electrons.
ACS PHOTONICS, 9 (4).
pp. 1143-1149.
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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.
| Item Type: | Article |
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| Uncontrolled Keywords: | THz generation, Smith-Purcell radiation, inverse design, light-matter interaction, free-electron light sources |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 19 Apr 2022 10:00 |
| Last Modified: | 18 Jan 2023 21:05 |
| DOI: | 10.1021/acsphotonics.1c01932 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3153049 |
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