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.

scholarly journals Binding Behavior of Carbonmonoxide to Gold Atoms on Ag(001)

2020 ◽  
Vol 63 (15-18) ◽  
pp. 1578-1584
Author(s):  
David Kuhness ◽  
Jagriti Pal ◽  
Hyun Jin Yang ◽  
Nisha Mammen ◽  
Karoliina Honkala ◽  
...  
Keyword(s):  
Binding Sites ◽  
Density Functional ◽  
Electron Tunneling ◽  
Scanning Tunneling ◽  
Inelastic Electron ◽  
Tunneling Microscopy ◽  
Binding Behavior ◽  
Inelastic Electron Tunneling ◽  
Experimental Findings ◽  
Electron Tunneling Spectroscopy

AbstractThe adsorption behavior of single CO molecules at 4 K bound to Au adatoms on a Ag(001) metal surface is studied with scanning tunneling microscopy (STM) and inelastic electron tunneling spectroscopy (IETS). In contrast to earlier observations two different binding configurations are observed—one on top of a Au adatom and the other one adsorbed laterally to Au on Ag(001). Moreover, IETS reveals different low-energy vibrational energies for the two binding sites as compared to the one for a single CO molecule bound to Ag(001). Density functional theory (DFT) calculations of the adsorption energies, the diffusion barriers, and the vibrational frequencies of the CO molecule on the different binding sites rationalize the experimental findings.

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 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.

scholarly journals Molecular attachment to a microscope tip: inelastic tunneling, Kondo screening, and thermopower

2019 ◽  
Vol 10 ◽  
pp. 1243-1250
Author(s):  
Rouzhaji Tuerhong ◽  
Mauro Boero ◽  
Jean-Pierre Bucher
Keyword(s):  
Single Molecule ◽  
Electron Tunneling ◽  
Vibrational Excitation ◽  
Scanning Tunneling ◽  
Clear Correlation ◽  
Inelastic Electron ◽  
Free Standing ◽  
Molecule Junction ◽  
Inelastic Electron Tunneling ◽  
Electron Tunneling Spectroscopy

The vibrational excitation related transport properties of a manganese phthalocyanine molecule suspended between the tip of a scanning tunneling microsope (STM) and a surface are investigated by combining the local manipulation capabilities of the STM with inelastic electron tunneling spectroscopy. By attachment of the molecule to the probe tip, the intrinsic physical properties similar to those exhibited by a free standing molecule become accessible. This technique allows one to study locally the magnetic properties, as well as other elementary excitations and their mutual interaction. In particular a clear correlation is observed between the Kondo resonance and the vibrations with a strong incidence of the Kondo correlation on the thermopower measured across the single-molecule junction.

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