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Numerical investigation of asymmetric nanophotonic structure for accelerating sub-relativistic electron beams

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posted on 2024-01-02, 08:14 authored by Xiriai Maimaiti, Aimierding Aimidula, Mamat Ali BAKE, Ping Zhang
We proposed an asymmetrically placed nanophotonic dual-pillar structure, the dielectric part and the vacuum part of the structure are evenly distributed in the direction of electron propagation. This structure is optimized for sub-relativistic electron acceleration. We discuss numerical simulation results, which show that the previously proposed dielectric grating structure is accompanied by a deceleration region that is not conducive to achieving high gradients during the entire acceleration process. By our scheme, the deceleration field is completely eliminated, and a uniform distribution of acceleration field is produced in the acceleration channel of the asymmetric grating structure. Our structure requires two laser pulses with a specific phase difference injected from both sides of the structure to achieve the optimization of the acceleration field. The structure has great potential in the acceleration of sub-relativistic electron beams. To show the comparative advantages of this asymmetric design, we also numerically investigated the symmetric structure. The acceleration gradient provided by the symmetric structure for sub-relativistic electrons is about 70 MeV/m, however, the maximum acceleration gradient provided by asymmetric structure for sub-relativistic electrons is up to ∼430 MeV/m.


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National Natural Science Foundation of China (11575150,12265024,62171098)

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Highlighter Commentary

This study introduces an asymmetric grating structure that surpasses symmetric designs, achieving a high gradient of ~430 MeV/m for sub-relativistic electron acceleration. This technology could enable advancements in miniaturized, laser-based cascade acceleration devices, and notably, in dielectric THz accelerators. --Mousa Moradi, Ph.D. Candidate, Biomedical Engineering, UMASS Amherst

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