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Title: Periodically pulsed laser-assisted tunneling may generate terahertz radiation

Abstract

In this work, a mode-locked ultrafast laser focused on the tunneling junction of a scanning tunneling microscope superimposes harmonics of the laser pulse repetition frequency on the direct current tunneling current. The power measured at the first 200 harmonics (up to 14.85 GHz) varies as the inverse square of the frequency due to shunting by the stray capacitance and the resistance in the circuit. However, Fourier analysis suggests that within the tunneling junction there is no significant decay of the harmonics until terahertz frequencies comparable to the reciprocal of the laser pulse-width. Two different types of analysis are used to model the generation of the frequency comb within the tunneling junction. Similar results are obtained, suggesting that the harmonics may extend to terahertz frequencies. Thus, the tunneling junction may be used as a subnanometer sized source of terahertz radiation.

Authors:
 [1];  [1]; ORCiD logo [2]
  1. NewPath Research L.L.C., Salt Lake City, UT (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1505991
Report Number(s):
LA-UR-17-20587
Journal ID: ISSN 2166-2746
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Vacuum Science and Technology. B, Nanotechnology and Microelectronics
Additional Journal Information:
Journal Volume: 35; Journal Issue: 3; Journal ID: ISSN 2166-2746
Publisher:
American Vacuum Society/AIP
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE

Citation Formats

Hagmann, Mark J., Coombs, David G., and Yarotski, Dmitry Anatolievitch. Periodically pulsed laser-assisted tunneling may generate terahertz radiation. United States: N. p., 2017. Web. doi:10.1116/1.4979549.
Hagmann, Mark J., Coombs, David G., & Yarotski, Dmitry Anatolievitch. Periodically pulsed laser-assisted tunneling may generate terahertz radiation. United States. doi:10.1116/1.4979549.
Hagmann, Mark J., Coombs, David G., and Yarotski, Dmitry Anatolievitch. Mon . "Periodically pulsed laser-assisted tunneling may generate terahertz radiation". United States. doi:10.1116/1.4979549. https://www.osti.gov/servlets/purl/1505991.
@article{osti_1505991,
title = {Periodically pulsed laser-assisted tunneling may generate terahertz radiation},
author = {Hagmann, Mark J. and Coombs, David G. and Yarotski, Dmitry Anatolievitch},
abstractNote = {In this work, a mode-locked ultrafast laser focused on the tunneling junction of a scanning tunneling microscope superimposes harmonics of the laser pulse repetition frequency on the direct current tunneling current. The power measured at the first 200 harmonics (up to 14.85 GHz) varies as the inverse square of the frequency due to shunting by the stray capacitance and the resistance in the circuit. However, Fourier analysis suggests that within the tunneling junction there is no significant decay of the harmonics until terahertz frequencies comparable to the reciprocal of the laser pulse-width. Two different types of analysis are used to model the generation of the frequency comb within the tunneling junction. Similar results are obtained, suggesting that the harmonics may extend to terahertz frequencies. Thus, the tunneling junction may be used as a subnanometer sized source of terahertz radiation.},
doi = {10.1116/1.4979549},
journal = {Journal of Vacuum Science and Technology. B, Nanotechnology and Microelectronics},
number = 3,
volume = 35,
place = {United States},
year = {2017},
month = {4}
}

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Cited by: 2 works
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Figures / Tables:

FIG. 1 FIG. 1: Normalized PSD GkϵN , vs. ϵ for different values of N in (12).

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.