scholarly journals Characterization of the optical properties of the buried contact of the JWST MIRI Si: as infrared blocked impurity band detectors

2020 ◽  
Author(s):  
Ioannis Argyriou ◽  
George H. Rieke ◽  
Michael E. Ressler ◽  
Andras Gaspar ◽  
Bart Vandenbussche
Keyword(s):  
Optical Properties ◽  
Impurity Band ◽  
Blocked Impurity Band Detectors

Characterization of the optical properties of an infrared blocked impurity band detector

2011 ◽  
Vol 50 (24) ◽  
pp. 4824 ◽  
Author(s):  
S. I. Woods ◽  
S. G. Kaplan ◽  
T. M. Jung ◽  
A. C. Carter
Keyword(s):  
Optical Properties ◽  
Impurity Band

scholarly journals Comparison of ISS–CATS and CALIPSO–CALIOP Characterization of High Clouds in the Tropics

2020 ◽  
Vol 12 (23) ◽  
pp. 3946
Author(s):  
Pasquale Sellitto ◽  
Silvia Bucci ◽  
Bernard Legras
Keyword(s):  
Optical Properties ◽  
Space Station ◽  
Satellite Observation ◽  
Observation Data ◽  
Upper Troposphere ◽  
Cloud Properties ◽  
Synchronous Orbit ◽  
The Tropics ◽  
High Clouds

Clouds in the tropics have an important role in the energy budget, atmospheric circulation, humidity, and composition of the tropical-to-global upper-troposphere–lower-stratosphere. Due to its non-sun-synchronous orbit, the Cloud–Aerosol Transport System (CATS) onboard the International Space Station (ISS) provided novel information on clouds from space in terms of overpass time in the period of 2015–2017. In this paper, we provide a seasonally resolved comparison of CATS characterization of high clouds (between 13 and 18 km altitude) in the tropics with well-established CALIPSO (Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observation) data, both in terms of clouds’ occurrence and cloud optical properties (optical depth). Despite the fact that cloud statistics for CATS and CALIOP are generated using intrinsically different local overpass times, the characterization of high clouds occurrence and optical properties in the tropics with the two instruments is very similar. Observations from CATS underestimate clouds occurrence (up to 80%, at 18 km) and overestimate the occurrence of very thick clouds (up to 100% for optically very thick clouds, at 18 km) at higher altitudes. Thus, the description of stratospheric overshoots with CATS and CALIOP might be different. While this study hints at the consistency of CATS and CALIOP clouds characterizaton, the small differences highlighted in this work should be taken into account when using CATS for estimating cloud properties and their variability in the tropics.

Assessment of the characterization of nonabsorbing nanoparticles in suspension from effective optical properties

2015 ◽  
Vol 54 (31) ◽  
pp. 9082 ◽  
Author(s):  
R. Márquez-Islas ◽  
C. Sánchez-Pérez ◽  
A. García-Valenzuela
Keyword(s):  
Optical Properties

Si:Sb blocked impurity band detectors for infrared astronomy

1992 ◽  
Vol 72 (1) ◽  
pp. 273-275 ◽  
Author(s):  
James E. Huffman ◽  
A. G. Crouse ◽  
B. L. Halleck ◽  
T. V. Downes ◽  
Terry L. Herter
Keyword(s):  
Impurity Band ◽  
Infrared Astronomy ◽  
Blocked Impurity Band Detectors

First-Principles Study on Electronic and Optical Properties in Pr-Doped Anatase TiO2

2014 ◽  
Vol 924 ◽  
pp. 260-268 ◽  
Author(s):  
Hao Chen ◽  
Lan Fang Yao ◽  
Song Lin Yang ◽  
Ya Qin Wang ◽  
Xing Liang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
First Principles ◽  
Energy Gap ◽  
Impurity Band ◽  
Anatase Tio2 ◽  
Electron Hole ◽  
Light Region ◽  
Overlap Population ◽  
Calculation Results

The crystal structures, band structures, density of states, charge density, overlap population and optical properties of pure anatase TiO2 and Pr-doped anatase TiO2 were studied by using the plane-wave pseudopotential method based on the first-principles. After Pr doping, the valence band and the conduction band moved down and became dense, energy gap became narrow and a impurity band which consists of Pr 4f states appeared. And the dipole moment got improved, which is good for the separate of the electron-hole pairs. These effectively overcome two huge shortcomings of TiO2. Besides, Pr-doped anatase TiO2 produced more carriers which have good transport properties and the absorption spectra of Pr-O bond appear in the region that the wavelength is longer. The calculation results of optical properties show that the absorption edge occured red shift, which means the photocatalytic activity of anatase TiO2 got remarkable improved during visible-light region. This conforms to the previous analysis. So the photocatalytic activity of anatase TiO2 got remarkable improved after Pr doping.

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