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Title: Design of a plasmonic metasurface laser accelerator with a tapered phase velocity for subrelativistic particles

Abstract

A metallic metasurface-based laser-driven particle accelerator for subrelativistic particles is proposed and studied theoretically. The metasurface consists of a nonperiodic array of nanoslits which focuses the field of the driving laser, utilizing the phenomenon of extraordinary plasmonic transmission, to maximize the acceleration gradient. In order to account for the actual change in the particles’ velocity during their propagation through the structure, the separation between successive slits is not constant but rather optimized according to the expected trajectory of the particles. The metasurface laser accelerator (MLA) is designed for an ultrafast driving laser source operating at 2 μm wavelength. An approximate analytical model verified by particle tracking simulations predicts a net average acceleration with a normalized acceleration gradient of 1.34 times the incident laser field. Compared to other laser-driven accelerator designs, the MLA provides substantially higher efficiency, due to the field enhancement associated with nanoantennas, and relaxed fabrication challenges (especially for subrelativistic particles). It is found that the output particle beam is microbunched, suggesting the possibility of using a short MLA structure as a prebuncher to improve the initial capture efficiency in a subsequent longer MLA device. The impact of space-charge effects is also studied, and the loaded gradient and optimalmore » bunch charge are estimated.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Tel Aviv Univ., Ramat Aviv (Israel); Stanford Univ., CA (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF); United States-Israel Binational Science Foundation (BSF); Gordon and Betty Moore Foundation (United States)
OSTI Identifier:
1494232
Alternate Identifier(s):
OSTI ID: 1494813
Grant/Contract Number:  
AC02-76SF00515; 1535711; 2014725; GBMF4744
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 22 Journal Issue: 2; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; laser driven electron acceleration; nanoantennas; plasmonics

Citation Formats

Bar-Lev, Doron, England, R. Joel, Wootton, Kent P., Liu, Weihao, Gover, Avraham, Byer, Robert, Leedle, Ken J., Black, D., and Scheuer, Jacob. Design of a plasmonic metasurface laser accelerator with a tapered phase velocity for subrelativistic particles. United States: N. p., 2019. Web. doi:10.1103/PhysRevAccelBeams.22.021303.
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Bar-Lev, Doron, England, R. Joel, Wootton, Kent P., Liu, Weihao, Gover, Avraham, Byer, Robert, Leedle, Ken J., Black, D., & Scheuer, Jacob. Design of a plasmonic metasurface laser accelerator with a tapered phase velocity for subrelativistic particles. United States. https://doi.org/10.1103/PhysRevAccelBeams.22.021303
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Bar-Lev, Doron, England, R. Joel, Wootton, Kent P., Liu, Weihao, Gover, Avraham, Byer, Robert, Leedle, Ken J., Black, D., and Scheuer, Jacob. Mon . "Design of a plasmonic metasurface laser accelerator with a tapered phase velocity for subrelativistic particles". United States. https://doi.org/10.1103/PhysRevAccelBeams.22.021303.
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@article{osti_1494232,
title = {Design of a plasmonic metasurface laser accelerator with a tapered phase velocity for subrelativistic particles},
author = {Bar-Lev, Doron and England, R. Joel and Wootton, Kent P. and Liu, Weihao and Gover, Avraham and Byer, Robert and Leedle, Ken J. and Black, D. and Scheuer, Jacob},
abstractNote = {A metallic metasurface-based laser-driven particle accelerator for subrelativistic particles is proposed and studied theoretically. The metasurface consists of a nonperiodic array of nanoslits which focuses the field of the driving laser, utilizing the phenomenon of extraordinary plasmonic transmission, to maximize the acceleration gradient. In order to account for the actual change in the particles’ velocity during their propagation through the structure, the separation between successive slits is not constant but rather optimized according to the expected trajectory of the particles. The metasurface laser accelerator (MLA) is designed for an ultrafast driving laser source operating at 2 μm wavelength. An approximate analytical model verified by particle tracking simulations predicts a net average acceleration with a normalized acceleration gradient of 1.34 times the incident laser field. Compared to other laser-driven accelerator designs, the MLA provides substantially higher efficiency, due to the field enhancement associated with nanoantennas, and relaxed fabrication challenges (especially for subrelativistic particles). It is found that the output particle beam is microbunched, suggesting the possibility of using a short MLA structure as a prebuncher to improve the initial capture efficiency in a subsequent longer MLA device. The impact of space-charge effects is also studied, and the loaded gradient and optimal bunch charge are estimated.},
doi = {10.1103/PhysRevAccelBeams.22.021303},
journal = {Physical Review Accelerators and Beams},
number = 2,
volume = 22,
place = {United States},
year = {Mon Feb 11 00:00:00 EST 2019},
month = {Mon Feb 11 00:00:00 EST 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevAccelBeams.22.021303
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Cited by: 5 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic of a single row of slot antenna unit cells in the metasurface; (b) schematic of the MLA formed by two parallel metasurfaces, symmetrically driven by cophased laser pulses incident from the top and bottom.
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    Figures / Tables found in this record:

    FIG. 1 (p. 2)figure
    FIG. 2 (p. 3)figure
    FIG. 3 (p. 3)figure
    FIG. 4 (p. 3)figure
    FIG. 5 (p. 5)figure
    FIG. 6 (p. 6)figure
    FIG. 7 (p. 6)figure
    FIG. 8 (p. 7)figure
    FIG. 9 (p. 8)figure
    TABLE I (p. 9)table
    FIG. 10 (p. 10)figure
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