On-Chip Laser Power Delivery System for Dielectric Laser Accelerators

TL;DR

This paper introduces an on-chip laser power delivery system using a fractal waveguide network for dielectric laser accelerators, enabling higher energy gains and longer interaction lengths through chip-integrated techniques.

Contribution

It presents a novel fractal waveguide network for on-chip laser delivery, replacing free-space methods and enabling scalable, high-gradient dielectric laser acceleration.

Findings

Estimated 21 keV energy gain over 192 μm at 108 MV/m gradient

Potential to reach 1 MeV energy gain in under 1 cm with multiple structures

Verified through detailed numerical simulations and modeling

Abstract

We propose an on-chip optical power delivery system for dielectric laser accelerators based on a fractal 'tree-branch' dielectric waveguide network. This system replaces experimentally demanding free-space manipulations of the driving laser beam with chip-integrated techniques based on precise nano-fabrication, enabling access to orders of magnitude increases in the interaction length and total energy gain for these miniature accelerators. Based on computational modeling, in the relativistic regime, our laser delivery system is estimated to provide 21 keV of energy gain over an acceleration length of 192 um with a single laser input, corresponding to a 108 MV/m acceleration gradient. The system may achieve 1 MeV of energy gain over a distance less than 1 cm by sequentially illuminating 49 identical structures. These findings are verified by detailed numerical simulation and modeling of the subcomponents and we provide a discussion of the main constraints, challenges, and relevant parameters in regards to on-chip laser coupling for dielectric laser accelerators.