Near-field THz nanoscopy at novel accelerator-based photon sources (Conference Presentation)

2018 ◽  
Author(s):  
Lukas M. Eng ◽  
Frederik Kuschewski ◽  
Jonathan Döring ◽  
Lukas Wehmeier ◽  
Thales de Oliveira ◽  
...  
Keyword(s):  
Near Field ◽  
Photon Sources

scholarly journals Near-Field THz Nanoscopy with Novel Accelerator-Based Photon Sources

Proceedings ◽  
2019 ◽  
Vol 26 (1) ◽  
pp. 1
Author(s):  
Lukas M. Eng ◽  
Frederik Kuschewski ◽  
Jonathan Döring ◽  
Lukas Wehmeier ◽  
Tobias Nörenberg ◽  
...  
Keyword(s):  
Near Field ◽  
Photon Sources

This talk advertises scattering-type scanning near-field. [...]

scholarly journals Probing dark exciton navigation through a local strain landscape in a WSe2 monolayer

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Ryan J. Gelly ◽  
Dylan Renaud ◽  
Xing Liao ◽  
Benjamin Pingault ◽  
Stefan Bogdanovic ◽  
...  
Keyword(s):  
High Strain ◽  
Single Photon ◽  
Near Field ◽  
Local Strain ◽  
Cryogenic Temperatures ◽  
Photon Sources ◽  
Tapered Optical Fiber ◽  
Long Lifetime ◽  
And Diffusion ◽  
Dark Exciton

AbstractIn WSe2 monolayers, strain has been used to control the energy of excitons, induce funneling, and realize single-photon sources. Here, we developed a technique for probing the dynamics of free excitons in nanoscale strain landscapes in such monolayers. A nanosculpted tapered optical fiber is used to simultaneously generate strain and probe the near-field optical response of WSe2 monolayers at 5 K. When the monolayer is pushed by the fiber, its lowest energy states shift by as much as 390 meV (>20% of the bandgap of a WSe2 monolayer). Polarization and lifetime measurements of these red-shifting peaks indicate they originate from dark excitons. We conclude free dark excitons are funneled to high-strain regions during their long lifetime and are the principal participants in drift and diffusion at cryogenic temperatures. This insight supports proposals on the origin of single-photon sources in WSe2 and demonstrates a route towards exciton traps for exciton condensation.

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

Principles of Planar Near-Field Antenna Measurements

2007 ◽  
Author(s):  
Stuart Gregson ◽  
John McCormick ◽  
Clive Parini
Keyword(s):  
Near Field ◽  
Antenna Measurements

Immobilization of Radionuclides on Iron Canister Material at Simulated Near-field Conditions

2008 ◽  
Author(s):  
Daqing Cui ◽  
Ylva Ranebo ◽  
Jeanett Low ◽  
Vincenzo Rondinella ◽  
Jinshan Pan ◽  
...  
Keyword(s):  
Near Field ◽  
Field Conditions

Magnetic Tag Antenna for UHF Near-field and Far-Field RFID Applications

2015 ◽  
Vol 5 (2) ◽  
pp. 119
Author(s):  
Mondher Dhaouadi ◽  
M. Mabrouk ◽  
T. Vuong ◽  
A. Ghazel
Keyword(s):  
Near Field ◽  
Far Field ◽  
Rfid Applications

Decoupled Location Parameter Estimation of Near-Field Sources with Symmetric ULA

2011 ◽  
Vol E94-B (9) ◽  
pp. 2646-2649
Author(s):  
Bum-Soo KWON ◽  
Tae-Jin JUNG ◽  
Kyun-Kyung LEE
Keyword(s):  
Parameter Estimation ◽  
Near Field ◽  
Location Parameter
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