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Proceedings Paper

Inverse design and demonstration of on-chip laser driven particle accelerators (Conference Presentation)
Author(s): Neil V Sapra; Ki Youl Yang; Dries Vercruysse; Kenneth J. Leedle; Dylan Black; Logan Su; Rahul Trivedi; Yu Miao; Olav Solgaard; Robert L. Byer; Jelena Vuckovic

Paper Abstract

Particle accelerators are central to applications ranging from high-energy physics to medical treatments. However, the cost and size of conventional accelerators operating in radio-frequencies is prohibitive for widespread proliferation. Operating at optical and near-infrared frequencies, dielectric laser accelerators (DLAs) leverage the high damage threshold of dielectric materials, advances in nanofabrication techniques, and femtosecond pulsed lasers to produce miniaturized laser-driven accelerators. Previous demonstrations of dielectric laser acceleration have utilized free-space lasers directly incident on the accelerating structure. While this is acceptable for proof-of-principle, for DLAs to become a mature technology, it is necessary to integrate the accelerators on-chip to increase scalability and robustness of the system. Here we demonstrate the first waveguide-integrated dielectric laser accelerator. In this scheme, a grating coupler is used to couple light from femtosecond pulsed laser to a 30 μm wide waveguide, fabricated on a silicon-on-insulator platform. The waveguide is then directly interfaced with an accelerating structure that is patterned with sub-wavelength features to produce near-fields phase-matched to electrons travelling through a vacuum-channel in the device. Both the input grating coupler and accelerator structure have been designed using the inverse design optimization approach. We have experimentally demonstrated these waveguide-integrated accelerators by showing acceleration of subrelativistic electrons of initial energy 83.5 keV. We observe a maximum energy modulation of 1.19 keV over 30 μm. These results represent a significant step toward scalable and integrable on-chip DLAs for applications in ultrafast, medical, and high-energy technologies.

Paper Details

Date Published: 9 September 2019
Proc. SPIE 11105, Novel Optical Systems, Methods, and Applications XXII, 111050Q (9 September 2019); doi: 10.1117/12.2529018
Show Author Affiliations
Neil V Sapra, Stanford Univ. (United States)
Ki Youl Yang, Stanford Univ. (United States)
Dries Vercruysse, Stanford Univ. (United States)
Kenneth J. Leedle, Stanford Univ. (United States)
Dylan Black, Stanford Univ. (United States)
Logan Su, Stanford Univ. (United States)
Rahul Trivedi, Stanford Univ. (United States)
Yu Miao, Stanford Univ. (United States)
Olav Solgaard, Stanford Univ. (United States)
Robert L. Byer, Stanford Univ. (United States)
Jelena Vuckovic, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 11105:
Novel Optical Systems, Methods, and Applications XXII
Cornelius F. Hahlweg; Joseph R. Mulley, Editor(s)

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