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Title: Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy

Abstract

Integrating femtosecond lasers with electron microscopies has enabled direct imaging of transient structures and morphologies of materials in real time and space. Here, we report the development of a laser-free ultrafast electron microscopy (UEM) offering the same capability but without requiring femtosecond lasers and intricate instrumental modifications. We create picosecond electron pulses for probing dynamic events by chopping a continuous beam with a radio frequency (RF)–driven pulser with the pulse repetition rate tunable from 100 MHz to 12 GHz. As a first application, we studied gigahertz electromagnetic wave propagation dynamics in an interdigitated comb structure. We reveal, on nanometer space and picosecond time scales, the transient oscillating electromagnetic field around the tines of the combs with time-resolved polarization, amplitude, and local field enhancement. This study demonstrates the feasibility of laser-free UEM in real-space visualization of dynamics for many research fields, especially the electrodynamics in devices associated with information processing technology.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4];  [4];  [3]; ORCiD logo [5]; ORCiD logo [6]
  1. Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA., School of Physics, Nankai University, Tianjin 300071, China.
  2. Collider-Accelerator Department, Brookhaven National Laboratory, Upton, NY 11973, USA.
  3. Euclid Techlabs LLC, 365 Remington Blvd., Bolingbrook, IL 60440, USA.
  4. Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
  5. Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
  6. Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA.
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1669728
Grant/Contract Number:  
DESC0012704
Resource Type:
Published Article
Journal Name:
Science Advances
Additional Journal Information:
Journal Name: Science Advances Journal Volume: 6 Journal Issue: 40; Journal ID: ISSN 2375-2548
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English

Citation Formats

Fu, Xuewen, Wang, Erdong, Zhao, Yubin, Liu, Ao, Montgomery, Eric, Gokhale, Vikrant J., Gorman, Jason J., Jing, Chunguang, Lau, June W., and Zhu, Yimei. Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy. United States: N. p., 2020. Web. doi:10.1126/sciadv.abc3456.
Fu, Xuewen, Wang, Erdong, Zhao, Yubin, Liu, Ao, Montgomery, Eric, Gokhale, Vikrant J., Gorman, Jason J., Jing, Chunguang, Lau, June W., & Zhu, Yimei. Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy. United States. doi:10.1126/sciadv.abc3456.
Fu, Xuewen, Wang, Erdong, Zhao, Yubin, Liu, Ao, Montgomery, Eric, Gokhale, Vikrant J., Gorman, Jason J., Jing, Chunguang, Lau, June W., and Zhu, Yimei. Fri . "Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy". United States. doi:10.1126/sciadv.abc3456.
@article{osti_1669728,
title = {Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy},
author = {Fu, Xuewen and Wang, Erdong and Zhao, Yubin and Liu, Ao and Montgomery, Eric and Gokhale, Vikrant J. and Gorman, Jason J. and Jing, Chunguang and Lau, June W. and Zhu, Yimei},
abstractNote = {Integrating femtosecond lasers with electron microscopies has enabled direct imaging of transient structures and morphologies of materials in real time and space. Here, we report the development of a laser-free ultrafast electron microscopy (UEM) offering the same capability but without requiring femtosecond lasers and intricate instrumental modifications. We create picosecond electron pulses for probing dynamic events by chopping a continuous beam with a radio frequency (RF)–driven pulser with the pulse repetition rate tunable from 100 MHz to 12 GHz. As a first application, we studied gigahertz electromagnetic wave propagation dynamics in an interdigitated comb structure. We reveal, on nanometer space and picosecond time scales, the transient oscillating electromagnetic field around the tines of the combs with time-resolved polarization, amplitude, and local field enhancement. This study demonstrates the feasibility of laser-free UEM in real-space visualization of dynamics for many research fields, especially the electrodynamics in devices associated with information processing technology.},
doi = {10.1126/sciadv.abc3456},
journal = {Science Advances},
number = 40,
volume = 6,
place = {United States},
year = {2020},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1126/sciadv.abc3456

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