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.

References in corpus (6)

• Dielectric Laser Acceleration
• Laser-based acceleration of non-relativistic electrons at a dielectric structure
• Alternating Phase Focusing for Dielectric Laser Acceleration
• Dielectric laser acceleration of electrons in the vicinity of single and double grating structures - theory and simulations
• Ultrafast scanning electron microscope applied for studying the interaction between free electrons and optical near-fields of periodic nanostructures
• Silicon dual pillar structure with a distributed Bragg reflector for dielectric laser accelerators: Design and fabrication

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• Low Energy Spread Attosecond Bunching and Coherent Electron Acceleration in Dielectric Nanostructures
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• Tracking with wakefields in dielectric laser acceleration grating structures
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• Internal Smith-Purcell radiation and its interplay with Cherenkov diffraction radiation in silicon -- a combined time and frequency domain numerical study
• SHarD: A beam dynamics simulationcode for dielectric laser acceleratorsbased on spatial harmonic field expansion
• Experimental considerations in electron beam transport on a nanophotonic chip using alternating phase focusing
• Imprinting the quantum statistics of photons on free electrons
• Analytical energy spectra and wake effects for relativistic dielectric laser accelerators