Grating-based waveguides for dielectric laser acceleration

Abstract

We propose a chip-scale hollow-core waveguide using high-contrast gratings as reflectors for dielectric laser acceleration. We show that confinement of a specified accelerating mode can be achieved by adjusting the thickness of a matching layer between the core and the highly reflective grating. Several examples of the grating-based waveguide and their characteristic parameters such as the group velocity, interaction impedance, and acceleration efficiency are presented. The planar structure of the waveguide makes fabrication and integration simple, which is required by an on-chip dielectric laser accelerator for high-energy, material, and medical applications.