Ultra-broadband perfect absorber based on successive nano-Cr-film

2018 ◽  
Author(s):  
Hongfei Jiao ◽  
Xinshang Niu ◽  
Jinlong Zhang ◽  
Xinbin Cheng ◽  
Zhanshan Wang ◽  
...  
Keyword(s):  
Perfect Absorber ◽  
Cr Film

Peak-to-background measurements on a 300-kV TEM/STEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1236-1237 ◽  
Author(s):  
S. M. Zemyan ◽  
D. B. Williams
Keyword(s):  
Electron Microscope ◽  
X Ray ◽  
Background Ratio ◽  
Window Method ◽  
Analytical Electron ◽  
Analytical Electron Microscope ◽  
Cr Film

As has been reported elsewhere, a thin evaporated Cr film can be used to monitor the x-ray peak to background ratio (P/B) in an analytical electron microscope. Presented here are the results of P/B measurements for the Cr Ka line on a Philips EM430 TEM/STEM, with Link Si(Li) and intrinsic Ge (IG) x-ray detectors. The goal of the study was to determine the best conditions for x-ray microanalysis.We used the Fiori P/B definition, in which P/B is the ratio of the total peak integral to the average background in a 10 eV channel beneath the peak. Peak and background integrals were determined by the window method, using a peak window from 5.0 to 5.7 keV about Cr Kα, and background windows from 4.1 to 4.8 keV and 6.3 to 7.0 keV.

High-resolution SEM and STEM of adrenocortical endothelium: Molecular resolution of membrane complexes

1993 ◽  
Vol 51 ◽  
pp. 610-611
Author(s):  
Robert P. Apkarian
Keyword(s):  
Fine Structure ◽  
Low Voltage ◽  
Uranyl Acetate ◽  
Correlative Microscopy ◽  
Coated Pits ◽  
Fine Grain ◽  
Structural Identity ◽  
Cellular Pathways ◽  
Steroidogenic Cells ◽  
Cr Film

A multitude of complex ultrastructural features are involved in endothelial cell (EC) gating and sorting of lipid through capillaries and into steroidogenic cells of the adrenal cortex. Correlative microscopy is necessary to distinguish the structural identity of features involved in specific cellular pathways. In addition to diaphragmed fenestrae that frequently appear in clusters, other 60-80 nm openings; plasmalemma vesicles (PV), channels and pockets fitted with diaphragms of the same dimension, coexist on the thin EC surface. Non-diaphragmed coated pits (CP) (100-120 nm) involved in receptor mediated endocytosis were also present on the EC membrane. The present study employed HRSEM of cryofractured and chromium coated specimens and low voltage HRSTEM of 80 nm thick LX-112 embedded sections stained with 2.0% uranyl acetate. Both preparations were imaged at 25 kV with a Topcon DS-130 FESEM equipped with in-lens stage and STEM detector.HRSEM images of the capillary lumen coated with a lnm continuous fine grain Cr film, provided the ability to scan many openings and resolve (SE-I contrast) the fine structure of diaphragm spokes and central densities (Fig. 1).

scholarly journals Broadband perfect absorber based on one ultrathin layer of refractory metal

2015 ◽  
Vol 40 (11) ◽  
pp. 2592 ◽  
Author(s):  
Huixu Deng ◽  
Zhigang Li ◽  
Liliana Stan ◽  
Daniel Rosenmann ◽  
David Czaplewski ◽  
...  
Keyword(s):  
Refractory Metal ◽  
Perfect Absorber ◽  
Ultrathin Layer

Three-band perfect absorber with high refractive index sensing based on active tunable Dirac semimetal

2021 ◽  
Author(s):  
Zhiyou Li ◽  
Zao Yi ◽  
Tinting Liu ◽  
Li Liu ◽  
Xifang Chen ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Refractive Index ◽  
Gold Layer ◽  
Perfect Absorber ◽  
Refractive Index Sensing ◽  
Dirac Semimetal

In this paper, we designed a three-band narrowband perfect absorber based on Bulk Dirac semimetallic (BDS) metamaterials. The absorber consists of a hollow Dirac semimetallic layer above, a gold layer...

scholarly journals Enhanced acoustic pressure sensors based on coherent perfect absorber-laser effect

2021 ◽  
Vol 129 (10) ◽  
pp. 104902
Author(s):  
Mohamed Farhat ◽  
Waqas W. Ahmad ◽  
Abdelkrim Khelif ◽  
Khaled N. Salama ◽  
Ying Wu
Keyword(s):  
Acoustic Pressure ◽  
Pressure Sensors ◽  
Perfect Absorber ◽  
Laser Effect ◽  
Coherent Perfect Absorber

Graphene-based dual-band tunable perfect absorber in THz range

2021 ◽  
Vol 68 (2) ◽  
pp. 93-99
Author(s):  
Zhaoyang Liu ◽  
Jian Li ◽  
Lingjuan He ◽  
Tianbao Yu
Keyword(s):  
Dual Band ◽  
Perfect Absorber ◽  
Thz Range
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