Nanoscale mapping of excitonic processes in single-layer MoS2 using tip-enhanced photoluminescence microscopy

Nanoscale ◽  
2016 ◽  
Vol 8 (20) ◽  
pp. 10564-10569 ◽  
Author(s):  
Weitao Su ◽  
Naresh Kumar ◽  
Sandro Mignuzzi ◽  
Jason Crain ◽  
Debdulal Roy
Keyword(s):  
Spatial Resolution ◽  
Single Layer ◽  
Raman Microscopy ◽  
Enhanced Photoluminescence ◽  
20 Nm ◽  
Photoluminescence Microscopy ◽  
First Time

Excitonic processes in single-layer MoS2 are mapped for the first time using tip-enhanced photoluminescence and Raman microscopy with 20 nm spatial resolution.

Single Layer Graphene for Estimation of Axial Spatial Resolution in Confocal Raman Microscopy Depth Profiling

2018 ◽  
Vol 91 (1) ◽  
pp. 1049-1055 ◽  
Author(s):  
Carol Korzeniewski ◽  
Jay P. Kitt ◽  
Saheed Bukola ◽  
Stephen E. Creager ◽  
Shelley D. Minteer ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Depth Profiling ◽  
Single Layer ◽  
Raman Microscopy ◽  
Single Layer Graphene ◽  
Confocal Raman Microscopy ◽  
Layer Graphene ◽  
Confocal Raman

Nanoscale mapping of intrinsic defects in single-layer graphene using tip-enhanced Raman spectroscopy

2016 ◽  
Vol 52 (53) ◽  
pp. 8227-8230 ◽  
Author(s):  
Weitao Su ◽  
Naresh Kumar ◽  
Ning Dai ◽  
Debdulal Roy
Keyword(s):  
Raman Spectroscopy ◽  
Spatial Resolution ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Intrinsic Defect ◽  
Intrinsic Defects ◽  
Layer Graphene ◽  
Tip Enhanced Raman Spectroscopy ◽  
20 Nm

Non-gap TERS with a contrast of 8.5 enables TERS mapping of graphene's intrinsic defect with a spatial resolution of 20 nm.

scholarly journals Line observations of the 30-Dor complex and N159A5 with the MPE imaging NIR spectrometer FAST

1991 ◽  
Vol 148 ◽  
pp. 205-206 ◽  
Author(s):  
A. Krabbe ◽  
J. Storey ◽  
V. Rotaciuc ◽  
S. Drapatz ◽  
R. Genzel
Keyword(s):  
Spatial Resolution ◽  
Molecular Hydrogen ◽  
Near Infrared ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Emission Lines ◽  
Resolving Power ◽  
Max Planck ◽  
First Time ◽  
Infrared Array

Images with subarcsec spatial resolution in the light of near-infrared atomic (Bry) and molecular hydrogen H2 (S(1) v=1-0) emission lines were obtained for some extended, pointlike objects in the Large Magellanic Cloud (LMC) for the first time. We used the Max-Planck-Institut für extraterrestrische Physik (MPE) near-infrared array spectrometer FAST (image scale 0.8”/pix, spectral resolving power 950) at the ESO/MPI 2.2m telescope, La Silla. We present some results on the 30-Dor complex and N159A5.

Perforation mechanics of UHMWPE soft ballistic sub-laminate and soft ballistic armor pack: A finite element study

2021 ◽  
pp. 089270572110420
Author(s):  
Bazle Z (Gama) Haque ◽  
John W Gillespie
Keyword(s):  
Finite Element ◽  
Single Layer ◽  
Areal Density ◽  
Element Model ◽  
Transverse Impact ◽  
Free Standing ◽  
Uhmwpe Fibers ◽  
Ballistic Limit Velocity ◽  
Definition Of ◽  
First Time

Soft-ballistic sub-laminate (SBSL) made from ultra-high molecular weight polyethylene (UHMWPE) fibers in [0/90] stacking sequence are the building block of a multi-layer soft-ballistic armor pack (SBAP, aka Soft Armor). A systematic study of the perforation dynamics of a single layer SBSL and several multi-layer SBAPs (2, 3, 4, 8, 16, 24, 32 layers) is presented for the first time in the literature. A previously validated finite element model of transverse impact on a single layer is used to study the perforation mechanics of multi-layer SBAPs with friction between individual layers. Following the classical definition of ballistic limit velocity, a minimum perforation velocity has been determined for free-standing single layer SBSL and multi-layer SBAPs. For the multi-layer SBAPs, complete perforations have been identified as progressive perforation of individual layers through the thickness. The minimum perforation velocities of multi-layer SBAPS is linear with the areal density for the eight (8) layer target and thicker. Large deformation behavior and perforation mechanics of the SBAPs is discussed in detail.

scholarly journals Mechanical frictional scanning probe lithography of TMDCs

2021 ◽  
Vol 2103 (1) ◽  
pp. 012090
Author(s):  
B R Borodin ◽  
F A Benimetskiy ◽  
P A Alekseev
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Transition Metal Dichalcogenides ◽  
Conventional Technique ◽  
Scanning Probe ◽  
Pressure Force ◽  
Scanning Probe Lithography ◽  
Metal Dichalcogenides ◽  
Mechanical Scanning ◽  
20 Nm

Abstract In this work, we investigate mechanical scanning probe lithography (SPL) of thick MoSe2 flakes. The conventional technique faces difficulties in processing the thick samples due to cantilever twisting that leads to the growth of a number of defects and artifacts that decrease spatial resolution. In course of this work, we proposed the approach of frictional-SPL based on small pressure force and many repetitions of lithographic patterns. This approach allows to avoid the formation of remarkable defects and maintain high spatial resolution. By frictional-SPL, we processed thick MoSe2 flakes (up to 40 nm thick) with the highest resolution down to 20 nm. The results of this work show that frictional-SPL is an effective method of resistless lithography suitable for fabricating nanodevices based on transition metal dichalcogenides (TMDC) materials.

3D ionization structure and kinematics of NGC 2392

2011 ◽  
Vol 7 (S283) ◽  
pp. 348-349
Author(s):  
Reginald J. Dufour ◽  
Jonathan N. Sick ◽  
Patrick M. Hartigan ◽  
Richard B. C. Henry ◽  
Karen B. Kwitter ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Velocity Structure ◽  
High Spatial Resolution ◽  
Emission Lines ◽  
3 Dimensional ◽  
3D Morphology ◽  
Ionization Structure ◽  
First Time ◽  
Echelle Spectroscopy

AbstractWe discuss the 3D morphology, ionization structure, and kinematics of NGC 2392, the “Eskimo,” based on new and archival HST imagery and new long-slit echelle spectroscopy. High spatial resolution ionization maps of the nebula were made from HST WFPC2 imagery and compared with their velocity structure in various emission lines from echelle spectra taken with the 4m telescope at Kitt Peak. The imagery and spectra were then compared to map the kinematics of the nebula in several emission lines and decode the 3-dimensional morphology and ionization structure of the nebula, including that of C+2 from C III] 1909 Å for the first time.

Short Wavelength Probing for Fault Isolation Applications

2020 ◽  
Author(s):  
Ravikumar Venkat Krishnan ◽  
Lua Winson ◽  
Vasanth Somasundaram ◽  
Phoa Angeline ◽  
Pey Kin Leong ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Spatial Resolution ◽  
Short Wavelength ◽  
Fault Isolation ◽  
Laser Probing ◽  
Successful Case ◽  
20 Nm

Abstract Short wavelength probing (SWP) uses wavelengths of light shorter than 1100 nm or energies higher than silicon bandgap for laser probing applications. While SWP allows a significant improvement to spatial resolution, there are aberrations to the collected laser probing waveforms which result in difficulties in signal interpretations. In this work, we assess the signals collected through SWP (785 nm) and introduce a photodiode model to explain the observations. We also present a successful case study using 785 nm for failure analysis in sub-20 nm FinFET technology.

Multi-Level Storage in Lateral Phase Change Memory: From 3 to 16 Resistance Levels

2013 ◽  
Vol 534 ◽  
pp. 131-135
Author(s):  
You Yin ◽  
Rosalena Irma Alip ◽  
Yu Long Zhang ◽  
Ryota Kobayashi ◽  
Sumio Hosaka
Keyword(s):  
Phase Change ◽  
Active Medium ◽  
Low Cost ◽  
Single Layer ◽  
Dynamic Switching ◽  
Non Volatile Memory ◽  
Controlled Crystallization ◽  
Multi Level ◽  
Switching Characteristics ◽  
20 Nm

Here, we report multi-level storage (MLS) in multi-layer (ML) and single-layer (SL) phase change memories (PCM). For the former ML-PCM device, the active medium with two layers of chalcogenide consists of a top 30 nm TiN/180 nm SbTeN/20 nm TiN/bottom 120 nm SbTeN stacked multi-layer. Three stable and distinct resistance states are demonstrated in both static and dynamic switching characteristics of the multi-layer devices. For the latter SL-PCM device, the active medium with only one layer of chalcogenide consists of a top 50 nm TiN/150 nm SbTeN. We demonstrate that the number of distinguishable resistance levels can readily reach 16 and even higher. These levels in this study result from the initial threshold switching and the subsequent current-controlled crystallization induced by Joule heating. Therefore, the latter memory allows the creation of many distinct levels, thus enabling the low-cost ultra-high-density non-volatile memory.

Multichannel Hadamard Transform Raman Microscopy

1990 ◽  
Vol 44 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Patrick J. Treado ◽  
Michael D. Morris
Keyword(s):  
Spatial Resolution ◽  
Spectral Resolution ◽  
Spatial Multiplexing ◽  
Raman Microscopy ◽  
Hadamard Transform ◽  
Multichannel Detection ◽  
Spatial Multiplex

Spatial multiplexing is combined with multichannel detection in a Hadamard transform Raman microscope which provides 127 × 128 pixel images with 12 cm−1 spectral resolution. Spatial resolution of 0.6 μm per pixel has been achieved. A spatial multiplex advantage of better that 104 is demonstrated. Instrumental design details and spectroscopic images are presented.

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