Two-color field enhancement at an STM junction for spatiotemporally resolved photoemission

Meng, Xiang; Jin, Wencan; Yang, Hao; Dadap, Jerry I.; Osgood, Jr., Richard M.; Dolocan, Andrei; Sutter, Peter; Camillone, III, Nicholas

doi:10.1364/OL.42.002651

Title: Two-color field enhancement at an STM junction for spatiotemporally resolved photoemission

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Abstract

Here, we report measurements and numerical simulations of ultrafast laser-excited carrier flow across a scanning tunneling microscope (STM) junction. The current from a nanoscopic tungsten tip across a ~1 nm vacuum gap to a silver surface is driven by a two-color excitation scheme that uses an optical delay-modulation technique to extract the two-color signal from background contributions. The role of optical field enhancements in driving the current is investigated using density functional theory and full three-dimensional finite-difference time-domain computations. We find that simulated field-enhanced two-photon photoemission (2PPE) currents are in excellent agreement with the observed exponential decay of the two-color photoexcited current with increasing tip–surface separation, as well as its optical-delay dependence. The results suggest an approach to 2PPE with simultaneous subpicosecond temporal and nanometer spatial resolution.

Authors:

Meng, Xiang ^[1]; Jin, Wencan ^[2]; Yang, Hao ^[1]; Dadap, Jerry I. ^[1]; Osgood, Jr., Richard M. ^[1]; Dolocan, Andrei ^[3]; Sutter, Peter ^[4]; Camillone, III, Nicholas ^[5]

Columbia Univ., New York, NY (United States)
Columbia Univ., New York, NY (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); The Univ. of Texas at Austin, Austin, TX (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Nebraska, Lincoln, NE (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: 2017-06-30

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1409641

Alternate Identifier(s):: OSTI ID: 1367373

Report Number(s):: BNL-114695-2017-JA
Journal ID: ISSN 0146-9592; OPLEDP; R&D Project: CO007; KC0301050

Grant/Contract Number:: SC0012704; AC02-98CH10886; FG02-90ER14104

Resource Type:: Accepted Manuscript

Journal Name:: Optics Letters

Additional Journal Information:: Journal Volume: 42; Journal Issue: 13; Journal ID: ISSN 0146-9592

Publisher:: Optical Society of America (OSA)

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Meng, Xiang, Jin, Wencan, Yang, Hao, Dadap, Jerry I., Osgood, Jr., Richard M., Dolocan, Andrei, Sutter, Peter, and Camillone, III, Nicholas. Two-color field enhancement at an STM junction for spatiotemporally resolved photoemission.  United States: N. p., 2017. 
Web.  doi:10.1364/OL.42.002651.

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                    Meng, Xiang, Jin, Wencan, Yang, Hao, Dadap, Jerry I., Osgood, Jr., Richard M., Dolocan, Andrei, Sutter, Peter, & Camillone, III, Nicholas. Two-color field enhancement at an STM junction for spatiotemporally resolved photoemission.  United States.  https://doi.org/10.1364/OL.42.002651

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                    Meng, Xiang, Jin, Wencan, Yang, Hao, Dadap, Jerry I., Osgood, Jr., Richard M., Dolocan, Andrei, Sutter, Peter, and Camillone, III, Nicholas. Fri .  
"Two-color field enhancement at an STM junction for spatiotemporally resolved photoemission".  United States.  https://doi.org/10.1364/OL.42.002651.  https://www.osti.gov/servlets/purl/1409641.

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@article{osti_1409641,

  title        = {Two-color field enhancement at an STM junction for spatiotemporally resolved photoemission},

  author       = {Meng, Xiang and Jin, Wencan and Yang, Hao and Dadap, Jerry I. and Osgood, Jr., Richard M. and Dolocan, Andrei and Sutter, Peter and Camillone, III, Nicholas},

  abstractNote = {Here, we report measurements and numerical simulations of ultrafast laser-excited carrier flow across a scanning tunneling microscope (STM) junction. The current from a nanoscopic tungsten tip across a ~1 nm vacuum gap to a silver surface is driven by a two-color excitation scheme that uses an optical delay-modulation technique to extract the two-color signal from background contributions. The role of optical field enhancements in driving the current is investigated using density functional theory and full three-dimensional finite-difference time-domain computations. We find that simulated field-enhanced two-photon photoemission (2PPE) currents are in excellent agreement with the observed exponential decay of the two-color photoexcited current with increasing tip–surface separation, as well as its optical-delay dependence. The results suggest an approach to 2PPE with simultaneous subpicosecond temporal and nanometer spatial resolution.},

  doi          = {10.1364/OL.42.002651},

  journal      = {Optics Letters},

  number       = 13,

  volume       = 42,

  place        = {United States},

  year         = {2017},

  month        = {6}

}

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