On-Chip Laser-Power Delivery System for Dielectric Laser Accelerators
We propose an on-chip optical-power delivery system for dielectric laser accelerators based on a fractal “tree-network” dielectric waveguide geometry. Here, this system replaces experimentally demanding free-space manipulations of the driving laser beam with chip-integrated techniques based on precise nanofabrication, 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 μm 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 of 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 with regard to on-chip laser coupling for dielectric laser accelerators.
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- Stanford Univ., CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Purdue Univ., West Lafayette, IN (United States)
- Publication Date:
- Grant/Contract Number:
- AC02-76SF00515; GBMF4744
- Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Applied
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 5; Journal ID: ISSN 2331-7019
- Publisher:
- American Physical Society (APS)
- Research Org:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org:
- USDOE; Gordon and Betty Moore Foundation
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
- OSTI Identifier:
- 1458469