scholarly journals Probing the Local Dielectric Function of WS2 on an Au Substrate by Near Field Optical Microscopy Operating in the Visible Spectral Range

2021 ◽  
pp. 151672
Author(s):  
Oisín Garrity ◽  
Alvaro Rodriguez ◽  
Niclas S. Mueller ◽  
Otakar Frank ◽  
Patryk Kusch
Keyword(s):  
Optical Microscopy ◽  
Dielectric Function ◽  
Spectral Range ◽  
Near Field ◽  
Visible Spectral Range

scholarly journals High-resolution quantitative determination of dielectric function by using scattering scanning near-field optical microscopy

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
D. E. Tranca ◽  
S. G. Stanciu ◽  
R. Hristu ◽  
C. Stoichita ◽  
S. A. M. Tofail ◽  
...  
Keyword(s):  
High Resolution ◽  
Quantitative Determination ◽  
Optical Microscopy ◽  
Dielectric Function ◽  
Near Field

Dielectric function of cubic InN from the mid-infrared to the visible spectral range

2008 ◽  
Vol 23 (5) ◽  
pp. 055001 ◽  
Author(s):  
P Schley ◽  
R Goldhahn ◽  
C Napierala ◽  
G Gobsch ◽  
J Schörmann ◽  
...  
Keyword(s):  
Dielectric Function ◽  
Spectral Range ◽  
Visible Spectral Range ◽  
Mid Infrared

scholarly journals Probing polarization and dielectric function of molecules with higher order harmonics in scattering–near-field scanning optical microscopy

2009 ◽  
Vol 106 (11) ◽  
pp. 114307 ◽  
Author(s):  
Maxim P. Nikiforov ◽  
Susanne C. Kehr ◽  
Tae-Hong Park ◽  
Peter Milde ◽  
Ulrich Zerweck ◽  
...  
Keyword(s):  
Optical Microscopy ◽  
Dielectric Function ◽  
Near Field ◽  
Higher Order ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

From Semiconductor to Metal in a Flash: Observing Ultrafast Laser-Induced Phase Transformations

1997 ◽  
Vol 481 ◽  
Author(s):  
J. P. Callan ◽  
A. M.-T. Kim ◽  
L. Huangt ◽  
E. N. Glezer ◽  
E. Mazur
Keyword(s):  
Phase Transformations ◽  
Dielectric Function ◽  
Spectral Range ◽  
Laser Excitation ◽  
Spectroscopic Technique ◽  
Ultrafast Laser ◽  
Lattice Heating ◽  
Fs Laser

ABSTRACTWe use a new broadband spectroscopic technique to measure ultrafast changes in the dielectric function of a material over the spectral range 1.5–3.5 eV following intense 70-fs laser excitation. The results reveal the nature of the phase transformations which occur in the material following excitation. We studied the response of GaAs and Si. For GaAs, there are three distinct regimes of behavior as the pump fluence is increased — lattice heating, lattice disordering, and a semiconductor-to-metal transition.

scholarly journals MoS2 Based Photodetectors: A Review

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2758
Author(s):  
Alberto Taffelli ◽  
Sandra Dirè ◽  
Alberto Quaranta ◽  
Lucio Pancheri
Keyword(s):  
Electric Fields ◽  
Spectral Range ◽  
Performance Metrics ◽  
Transition Metal Dichalcogenides ◽  
Visible Spectral Range ◽  
Detector Performance ◽  
Strong Light ◽  
Near Ultraviolet ◽  
Passivation Layers ◽  
Low Dimensional

Photodetectors based on transition metal dichalcogenides (TMDs) have been widely reported in the literature and molybdenum disulfide (MoS2) has been the most extensively explored for photodetection applications. The properties of MoS2, such as direct band gap transition in low dimensional structures, strong light–matter interaction and good carrier mobility, combined with the possibility of fabricating thin MoS2 films, have attracted interest for this material in the field of optoelectronics. In this work, MoS2-based photodetectors are reviewed in terms of their main performance metrics, namely responsivity, detectivity, response time and dark current. Although neat MoS2-based detectors already show remarkable characteristics in the visible spectral range, MoS2 can be advantageously coupled with other materials to further improve the detector performance Nanoparticles (NPs) and quantum dots (QDs) have been exploited in combination with MoS2 to boost the response of the devices in the near ultraviolet (NUV) and infrared (IR) spectral range. Moreover, heterostructures with different materials (e.g., other TMDs, Graphene) can speed up the response of the photodetectors through the creation of built-in electric fields and the faster transport of charge carriers. Finally, in order to enhance the stability of the devices, perovskites have been exploited both as passivation layers and as electron reservoirs.

Tip-Enhanced Near-Field Optical Microscopy of Quasi-1 D Nanostructures

ChemPhysChem ◽  
2011 ◽  
Vol 13 (4) ◽  
pp. 927-929 ◽  
Author(s):  
Miriam Böhmler ◽  
Achim Hartschuh
Keyword(s):  
Optical Microscopy ◽  
Near Field
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