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Title: Method for computationally efficient design of dielectric laser accelerator structures

Abstract

Here, dielectric microstructures have generated much interest in recent years as a means of accelerating charged particles when powered by solid state lasers. The acceleration gradient (or particle energy gain per unit length) is an important figure of merit. To design structures with high acceleration gradients, we explore the adjoint variable method, a highly efficient technique used to compute the sensitivity of an objective with respect to a large number of parameters. With this formalism, the sensitivity of the acceleration gradient of a dielectric structure with respect to its entire spatial permittivity distribution is calculated by the use of only two full-field electromagnetic simulations, the original and ‘adjoint’. The adjoint simulation corresponds physically to the reciprocal situation of a point charge moving through the accelerator gap and radiating. Using this formalism, we perform numerical optimizations aimed at maximizing acceleration gradients, which generate fabricable structures of greatly improved performance in comparison to previously examined geometries.

Authors:
 [1];  [2];  [3];  [3];  [1]
+ Show Author Affiliations
  1. Stanford Univ., Stanford, CA (United States)
  2. Louisiana State Univ., Baton Rouge, LA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1369313
Grant/Contract Number:  
GBMF4744; 1254934; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 13; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; optical devices; gratings; subwavelength structures

Citation Formats

Hughes, Tyler, Veronis, Georgios, Wootton, Kent P., England, R. Joel, and Fan, Shanhui. Method for computationally efficient design of dielectric laser accelerator structures. United States: N. p., 2017. Web. doi:10.1364/OE.25.015414.
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Hughes, Tyler, Veronis, Georgios, Wootton, Kent P., England, R. Joel, & Fan, Shanhui. Method for computationally efficient design of dielectric laser accelerator structures. United States. https://doi.org/10.1364/OE.25.015414
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Hughes, Tyler, Veronis, Georgios, Wootton, Kent P., England, R. Joel, and Fan, Shanhui. Thu . "Method for computationally efficient design of dielectric laser accelerator structures". United States. https://doi.org/10.1364/OE.25.015414. https://www.osti.gov/servlets/purl/1369313.
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@article{osti_1369313,
title = {Method for computationally efficient design of dielectric laser accelerator structures},
author = {Hughes, Tyler and Veronis, Georgios and Wootton, Kent P. and England, R. Joel and Fan, Shanhui},
abstractNote = {Here, dielectric microstructures have generated much interest in recent years as a means of accelerating charged particles when powered by solid state lasers. The acceleration gradient (or particle energy gain per unit length) is an important figure of merit. To design structures with high acceleration gradients, we explore the adjoint variable method, a highly efficient technique used to compute the sensitivity of an objective with respect to a large number of parameters. With this formalism, the sensitivity of the acceleration gradient of a dielectric structure with respect to its entire spatial permittivity distribution is calculated by the use of only two full-field electromagnetic simulations, the original and ‘adjoint’. The adjoint simulation corresponds physically to the reciprocal situation of a point charge moving through the accelerator gap and radiating. Using this formalism, we perform numerical optimizations aimed at maximizing acceleration gradients, which generate fabricable structures of greatly improved performance in comparison to previously examined geometries.},
doi = {10.1364/OE.25.015414},
journal = {Optics Express},
number = 13,
volume = 25,
place = {United States},
year = {Thu Jun 22 00:00:00 EDT 2017},
month = {Thu Jun 22 00:00:00 EDT 2017}
}
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https://doi.org/10.1364/OE.25.015414
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    Works referencing / citing this record:

    On-chip integrated laser-driven particle accelerator
    journal, January 2020

    Design of a tapered slot waveguide dielectric laser accelerator for sub-relativistic electrons
    journal, January 2018

    • Zhao, Zhexin; Hughes, Tyler W.; Tan, Si
    • Optics Express, Vol. 26, Issue 18
    • DOI: 10.1364/oe.26.022801

    Intelligent nanophotonics: merging photonics and artificial intelligence at the nanoscale
    journal, January 2019

    Design of a tapered slot waveguide dielectric laser accelerator for sub-relativistic electrons
    conference, January 2019

    • Zhao, Zhexin; Hughes, Tyler W.; Tan, Si
    • CLEO: Science and Innovations, Conference on Lasers and Electro-Optics
    • DOI: 10.1364/cleo_si.2019.sf2h.7

    Adjoint-based optimization of active nanophotonic devices
    conference, January 2019

    • Wang, Jiahui; Shi, Yu; Hughes, Tyler
    • CLEO: Science and Innovations, Conference on Lasers and Electro-Optics
    • DOI: 10.1364/cleo_si.2019.sw4j.5

    On-chip integrated laser-driven particle accelerator
    text, January 2019

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