Dielectric laser electron acceleration in a dual pillar grating with a distributed Bragg reflector
Abstract
We report on the efficacy of a novel design for dielectric laser accelerators by adding a distributed Bragg reflector (DBR) to a dual pillar grating accelerating structure. This mimics a double-sided laser illumination, resulting in an enhanced longitudinal electric field while reducing the deflecting transverse effects, when compared to single-sided illumination. We improve the coupling efficiency of the incident electric field into the accelerating mode by 57 percent. The 12 $\mu$m long structures accelerate sub-relativistic 28 keV electrons with gradients of up to 200 MeV/m in theory and 133 MeV/m in practice. Our work shows how lithographically produced nano-structures help to make novel laser accelerators more efficient.
- Publication:
-
Optics Letters
- Pub Date:
- March 2019
- DOI:
- 10.1364/OL.44.001520
- arXiv:
- arXiv:1905.05489
- Bibcode:
- 2019OptL...44.1520Y
- Keywords:
-
- Physics - Accelerator Physics;
- Physics - Optics
- E-Print:
- doi:10.1364/OL.44.001520