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We report on the efficacy of a novel design for dielectric laser acceleratorsby adding a distributed Bragg reflector (DBR) to a dual pillar gratingaccelerating structure. This mimics a double-sided laser illumination,resulting in an enhanced longitudinal electric field while reducing thedeflecting transverse effects, when compared to single-sided illumination. Weimprove the coupling efficiency of the incident electric field into theaccelerating mode by 57 percent. The 12 $\mu$m long structures acceleratesub-relativistic 28 keV electrons with gradients of up to 200 MeV/m in theoryand 133 MeV/m in practice. Our work shows how lithographically producednano-structures help to make novel laser accelerators more efficient.

Dielectric-laser electron acceleration in a dual pillar grating with a distributed Bragg reflector