scholarly journals Sub-cycle Manipulation of Electrons in a Tunnel Junction with Phase-controlled Single-cycle THz Near-fields

2019 ◽  
Vol 205 ◽  
pp. 08007
Author(s):  
Katsumasa Yoshioka ◽  
Ikufumi Katayama ◽  
Yusuke Arashida ◽  
Atsuhiko Ban ◽  
Yoichi Kawada ◽  
...  
Keyword(s):  
Tunnel Junction ◽  
Phase Shifter ◽  
Electron Tunneling ◽  
Near Field ◽  
Scanning Tunneling ◽  
Electron Dynamics ◽  
Tunneling Microscopy ◽  
Single Cycle ◽  
Carrier Envelope Phase ◽  
Tunneling Dynamics

By utilizing terahertz scanning tunneling microscopy (THz-STM) with a carrier envelope phase shifter for broadband THz pulses, we could successfully control the near-field-mediated electron dynamics in a tunnel junction with sub-cycle precision. Measurements of the phase-resolved sub-cycle electron tunneling dynamics revealed an unexpected large carrier-envelope phase shift between far-field and near-field single-cycle THz waveforms.

scholarly journals Tailoring Single-Cycle Near Field in a Tunnel Junction with Carrier-Envelope Phase-Controlled Terahertz Electric Fields

Nano Letters ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 5198-5204 ◽  
Author(s):  
Katsumasa Yoshioka ◽  
Ikufumi Katayama ◽  
Yusuke Arashida ◽  
Atsuhiko Ban ◽  
Yoichi Kawada ◽  
...  
Keyword(s):  
Electric Fields ◽  
Tunnel Junction ◽  
Near Field ◽  
Single Cycle ◽  
Carrier Envelope Phase

scholarly journals Active optical antennas driven by inelastic electron tunneling

Nanophotonics ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 1503-1516 ◽  
Author(s):  
Kai Braun ◽  
Florian Laible ◽  
Otto Hauler ◽  
Xiao Wang ◽  
Anlian Pan ◽  
...  
Keyword(s):  
Noble Metal ◽  
High Speed ◽  
Electron Tunneling ◽  
Electromagnetic Coupling ◽  
Near Field ◽  
Scanning Tunneling ◽  
Inelastic Electron ◽  
Tunneling Microscopy ◽  
Inelastic Electron Tunneling ◽  
Nano Antennas

AbstractIn this review, we focus on the experimental demonstration of enhanced emission from single plasmonic tunneling junctions consisting of coupled nano antennas or noble metal tips on metallic substrates in scanning tunneling microscopy. Electromagnetic coupling between resonant plasmonic oscillations of two closely spaced noble metal particles leads to a strongly enhanced optical near field in the gap between. Electron beam lithography or wet chemical synthesis enables accurate control of the shape, aspect ratio, and gap size of the structures, which determines the spectral shape, position, and width of the plasmonic resonances. Many emerging nano-photonic technologies depend on the careful control of such localized resonances, including optical nano antennas for high-sensitivity sensors, nanoscale control of active devices, and improved photovoltaic devices. The results discussed here show how optical enhancement inside the plasmonic cavity can be further increased by a stronger localization via tunneling. Inelastic electron tunneling emission from a plasmonic junction allows for new analytical applications. Furthermore, the reviewed concepts represent the basis for novel ultra-small, fast, optically, and electronically switchable devices and could find applications in high-speed signal processing and optical telecommunications.

Stm Studies at Electrochemically Controlled Interfaces

1994 ◽  
Vol 332 ◽  
Author(s):  
S.M. Lindsay ◽  
J. Pan ◽  
T.W. Jing
Keyword(s):  
Electron Tunneling ◽  
Point Contact ◽  
Localized States ◽  
Scanning Tunneling ◽  
Zero Field ◽  
Tunneling Microscopy ◽  
Dna Oligomers ◽  
Synthetic Dna ◽  
Quantum Point

ABSTRACTWe use electrochemical methods to control the adsorption of molecules onto an electrode for imaging in-situ by scanning tunneling microscopy. Measurements of the barrier for electron tunneling show that the mechanism of electron transfer differs from vacuum tunneling. Barriers depend upon the direction of electron tunneling, indicating the presence of permanently aligned dipoles in the tunnel gap. We attribute a sharp dip in the barrier near zero field to induced polarization. We propose a ‘tunneling’ process consisting of two parts: One is delocalization of quantum-coherent states in parts of the molecular adlayer that hybridize strongly (interaction ≥ kT) with Bloch states in the metal. This gives rise to a quantum-point-contact conductance, Gc ≤ 2e2/h at a height zo. The other part comes from the exponential decay of the tails of localized states, G = Gc exp{−2K(z − z0)}. Because measured decay lengths, (2K‘)−1, are small (≈ 1 Å), STM contrast is dominated by the contour along which G[z0 (x,y)] = Gc. Measured changes in z0 are used to calculate images which are in reasonable agreement with observations. We illustrate this with images of synthetic DNA oligomers.

Attosecond coherent manipulation of electrons in tunneling microscopy

Science ◽  
2019 ◽  
Vol 367 (6476) ◽  
pp. 411-415 ◽  
Author(s):  
M. Garg ◽  
K. Kern
Keyword(s):  
Tunnel Junction ◽  
Coherent Control ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Optical Pulses ◽  
Nanoelectronic Devices ◽  
Electronic Current ◽  
And Control ◽  
Coherent Manipulation ◽  
Manipulation And Control

Nanoelectronic devices operating in the quantum regime require coherent manipulation and control over electrons at atomic length and time scales. We demonstrate coherent control over electrons in a tunnel junction of a scanning tunneling microscope by means of precise tuning of the carrier-envelope phase of two-cycle long (<6-femtosecond) optical pulses. We explore photon and field-driven tunneling, two different regimes of interaction of optical pulses with the tunnel junction, and demonstrate a transition from one regime to the other. Our results show that it is possible to induce, track, and control electronic current at atomic scales with subfemtosecond resolution, providing a route to develop petahertz coherent nanoelectronics and microscopy.

Near‐field magneto‐optical imaging in scanning tunneling microscopy

1995 ◽  
Vol 66 (9) ◽  
pp. 1141-1143 ◽  
Author(s):  
M. W. J. Prins ◽  
R. H. M. Groeneveld ◽  
D. L. Abraham ◽  
H. van Kempen ◽  
H. W. van Kesteren
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Optical Imaging ◽  
Near Field ◽  
Scanning Tunneling ◽  
Tunneling Microscopy

scholarly journals Spatial mapping of optical modes in plasmonic nanoantenna by scanning tunneling microscopy

2021 ◽  
Vol 2015 (1) ◽  
pp. 012139
Author(s):  
V A Shkoldin ◽  
D V Lebedev ◽  
A M Mozharov ◽  
D V Permyakov ◽  
L N Dvoretckaia ◽  
...  
Keyword(s):  
Near Field ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Scanning Tunneling ◽  
Inelastic Electron ◽  
Ambient Conditions ◽  
Tunneling Microscopy ◽  
Theoretical Predictions ◽  
Optical Modes ◽  
On Chip

Abstract Using of inelastic electron tunnelling is very promising approach to study of subwavelength photons and plasmons sources. Such sources are very important for improving of on-chip data processing. One of the ways for development of efficient and compact optical electrically-driven sources is using of nanoantenna placed into the tunnel junction. In this work, singe optical nanoantenna was investigated under ultra-high vacuum and ambient conditions. Photon maps of nanoantenna excited under scanning tunnel microscope tip was observed and the obtained results was compared with the theoretical predictions of electromagnetic near-field distribution.

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