Papers › On-Chip Laser Power Delivery System for Dielectric Laser Accelerators
On-Chip Laser Power Delivery System for Dielectric Laser Accelerators
Tyler W. Hughes, Si Tan, Zhexin Zhao, Neil V. Sapra, Yun Jo Lee, Kenneth J. Leedle, Huiyang Deng, Yu Miao, Dylan S. Black, Minghao Qi, Olav Solgaard, James S. Harris, Jelena Vuckovic, Robert L. Byer, Shanhui Fan
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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.
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