Design and fabrication improvements for the dielectric laser accelerators
Abstract/Contents
- Abstract
- Accelerated particle beams have already played and will continue a growing role in the analysis and fabrication of commercially important products, particularly in the development of the next generation of electronics, advanced engineering and smart materials. Without accelerators, major advances in the biosciences of the past 50 years would not have happened, and future developments in accelerator technology will stimulate a better understanding of living processes, leading to new medicines and therapies. However, the size and cost of the conventional radio-frequency (RF) accelerators limit the wide distribution of the accelerator technology. Dielectric laser accelerators (DLAs) aim to shrink down the dimension of the RF accelerators by using near-infrared (NIR) ultrafast femto-second laser to drive dielectric structures as well as provide higher acceleration gradient. The driving wavelength for DLA is 1000X smaller than RF accelerators, which leads to 1000X smaller in accelerator dimension. Additionally, dielectric material, like silicon and silicon dioxide, can survive under one to two orders of magnitude higher energy compared with metal used in RF accelerators. DLA can provide acceleration gradient upwards of 1GV/m, compared to 30-100MV/m for RF accelerators limited by material damage. In this thesis, I will discuss the design and fabrication improvements for DLA in both sub-relativistic and relativistic regime. In the sub-relativistic regime, silicon pillars have been used as accelerators. Hydrogen annealing process can decrease the variation of laser induced damage threshold (LIDT) for silicon pillars, and also makes the damage site positions agree with corresponding field hotspots. A thin film of low-stress nitride coating on silicon pillars can improve LIDT by 27% and acceleration gradient by 11%. In the relativistic regime, eutectic bonding is applied in chip-level fused silica bonding to fabricate accelerators. Single grating /DBR design is proposed and fabricated to provide better symmetric acceleration gradient distribution and remove alignment requirement during bonding process. In order to move towards multi-stage integrated DLA, silicon nitride waveguide-based power delivery DLA is proposed and fabricated. Nitride grating coupler efficiency is measured to be 20.5% and damage at input pulse energy of 15nJ. These results enable the accelerators powered by on-chip couplers and waveguides.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2020; ©2020 |
| Publication date | 2020; 2020 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Miao, Yu |
|---|---|
| Degree supervisor | Solgaard, Olav |
| Thesis advisor | Solgaard, Olav |
| Thesis advisor | Fan, Shanhui, 1972- |
| Thesis advisor | Harris, J. S. (James Stewart), 1942- |
| Degree committee member | Fan, Shanhui, 1972- |
| Degree committee member | Harris, J. S. (James Stewart), 1942- |
| Associated with | Stanford University, Department of Electrical Engineering |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Yu Miao. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2020. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2020 by Yu Miao
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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