Acceleration gradients in dielectric laser accelerators with triangular-shaped gratings

TL;DR

This paper compares the acceleration gradients achievable in dielectric laser accelerators using rectangular and triangular grating profiles, including reflective coatings, to identify optimal structures for energy gain.

Contribution

It introduces a detailed comparison of rectangular and triangular grating profiles with various angles and coatings for dielectric laser accelerators.

Findings

Triangular profiles with smaller angles yield higher gradients.

Reflective gold coatings enhance maximum energy gains.

Different profile orientations affect acceleration performance.

Abstract

The study investigated transparent on-chip structures with a rectangular profile and triangular profiles with grating ridge base angles of $\alpha = 36^\circ$, $30^\circ$, and $20^\circ$. Each triangular structure had both left- and right-handed profile orientations. For all variants, a modified version with a reflective gold coating was additionally considered. The maximum energy gains and accelerating gradients were determined and quantified for all structure classes: transparent and reflective (with both rectangular and triangular profiles).