scholarly journals Photoluminescence Imaging and Wavelength Analysis of Basal Plane Frank-Type Defects in 4H-SiC Epilayers

2012 ◽  
Vol 725 ◽  
pp. 15-18 ◽  
Author(s):  
Isaho Kamata ◽  
Xuan Zhang ◽  
Hidekazu Tsuchida
Keyword(s):  
Basal Plane ◽  
Partial Dislocation ◽  
Near Infrared ◽  
Stacking Fault ◽  
Profile Measurement ◽  
Infrared Wavelength ◽  
Visible Light Range ◽  
Wide Range ◽  
Fault Region ◽  
Narrow Emission

Frank-type defects on a basal plane have been investigated using photoluminescence (PL) imaging microscopy and wavelength profile measurement. A wide range of emission in the near-infrared wavelength was observed from a Frank partial dislocation at the edge of the defect, while a narrow emission at around the visible light range was obtained from a stacking fault region. The emissions from a stacking fault region of three kinds of basal plane Frank-type defects were confirmed to have different wavelengths depending on their stacking structures.

Ion Beam Sputter Deposition of Refractory Metal Oxides

1994 ◽  
Vol 354 ◽  
Author(s):  
B.E. Kempf ◽  
H.W. Dinges ◽  
A. PÖcker
Keyword(s):  
Near Infrared ◽  
Filter Design ◽  
Ion Beam ◽  
Optical Filter ◽  
Pure Metal ◽  
Ion Beam Sputtering ◽  
Infrared Wavelength ◽  
Wide Range ◽  
Beam Sputtering ◽  
Ion Beam Sputter Deposition

AbstractOxides of hafnium, niobium, tantalum, and zirconium are deposited by ion beam sputtering of the pure metal targets using CO2 as working gas. The resulting thin films are amorphous, featureless smooth and of excellent adherence to semiconductor substrates. Despite a certain content of carbon they are highly transparent in the visible and near infrared wavelength range as determined by spectroscopic ellipsometry. Their wide range of refractive indices makes them suitable for multilayer optical filter design.

scholarly journals Highly transparent conductive AZO/Zr50Cu50/AZO films in wide range of visible and near infrared wavelength grown by pulsed laser deposition

2017 ◽  
Vol 7 ◽  
pp. 910-913 ◽  
Author(s):  
Jingyun Cheng ◽  
Guohua Cao ◽  
Haitao Zong ◽  
Chaoyang Kang ◽  
Erguang Jia ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Near Infrared ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Infrared Wavelength ◽  
Wide Range

scholarly journals Apparent Anomalous Absorption and Image Matching

1969 ◽  
Vol 22 (5) ◽  
pp. 559 ◽  
Author(s):  
LM Clarebrough
Keyword(s):  
Electron Micrographs ◽  
Image Matching ◽  
Partial Dislocation ◽  
Stacking Fault ◽  
Anomalous Absorption ◽  
Shockley Partial Dislocation ◽  
Topological Features ◽  
Wide Range ◽  
Visual Matching ◽  
Absorption Constant

Visual matching of experimental and theoretical electron micrographs can be used to determine the apparent anomalous absorption constant. The method has been applied to a copper-silicon (8 at. % Si) alloy by matching experimental and theoretical images of a Shockley partial dislocation and the main and subsidiary fringes of the associated stacking fault. The value of 0�067 which is obtained is considerably less than the value of 0�1 usually assumed for metals and alloys. In foils approximately 3611 thick details of the image are very sensitive to the value ofthe anomalous absorption constant and the value of 0�1 is inadequate for image matching. However, in foils approximately 6611thick the general topological features of an image are little altered by varying the anomalous absorption constant over a wide range and the approximate value of O� 1 is adequate for image matching.

scholarly journals Characterization of Predictable Quantum Efficient Detector over a wide range of incident optical power and wavelength.

2021 ◽  
Author(s):  
Mikhail Korpusenko ◽  
Farshid Manoocheri ◽  
Olli-Pekka Kilpi ◽  
Aapo Varpula ◽  
Markku Kainlauri ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Near Infrared ◽  
Optical Power ◽  
Depletion Region ◽  
Negative Slope ◽  
Entrance Window ◽  
Logarithmic Scale ◽  
Infrared Wavelength ◽  
Wide Range ◽  
Penetration Depths

Abstract We investigate the Predictable Quantum Efficient Detector (PQED) in the visible and near-infrared wavelength range. The PQED consists of two n-type induced junction photodiodes with Al2O3 entrance window. Measurements are performed at the wavelengths of 488 nm and 785 nm with incident power levels ranging from 100 µW to 1000 µW. A new way of presenting the normalized photocurrents on a logarithmic scale as a function of bias voltage reveals two distinct negative slope regions and allows direct comparison of charge carrier losses at different wavelengths. The comparison indicates mechanisms that can be understood on the basis of different penetration depths at different wavelengths (0.77 μm at 488 nm and 10.2 μm at 785 nm). The difference in the penetration depths leads also to larger difference in the charge-carrier losses at low bias voltages than at high voltages due to the voltage dependence of the depletion region.

Highly transparent conductive F-doped ZnO films in wide range of visible and near infrared wavelength deposited on polycarbonate substrates

2014 ◽  
Vol 614 ◽  
pp. 71-74 ◽  
Author(s):  
Xiangyu Zhang ◽  
Liping Zhu ◽  
Hongbin Xu ◽  
Linxiang Chen ◽  
Yanmin Guo ◽  
...  
Keyword(s):  
Near Infrared ◽  
Zno Films ◽  
Infrared Wavelength ◽  
Wide Range ◽  
Doped Zno

scholarly journals Stripping of the Positive-tone Diazonaphthoquinone / Novolak Resist using Laser Irradiation from Visible to Near Infrared Wavelength

2012 ◽  
Vol 25 (6) ◽  
pp. 741-746 ◽  
Author(s):  
Tomosumi Kamimura ◽  
Hiroki Muraoka ◽  
Yuki Yamana ◽  
Yoshiaki Matsura ◽  
Hideo Horibe
Keyword(s):  
Laser Irradiation ◽  
Near Infrared ◽  
Infrared Wavelength

scholarly journals Portable near Infrared Spectroscopy as a Tool for Fresh Tomato Quality Control Analysis in the Field

2021 ◽  
Vol 11 (7) ◽  
pp. 3209
Author(s):  
Karla R. Borba ◽  
Didem P. Aykas ◽  
Maria I. Milani ◽  
Luiz A. Colnago ◽  
Marcos D. Ferreira ◽  
...  
Keyword(s):  
Citric Acid ◽  
Near Infrared ◽  
Prediction Models ◽  
Quality Attributes ◽  
Internal Quality ◽  
Control Analysis ◽  
Tomato Quality ◽  
Wide Range ◽  
Different Types ◽  
Fresh Tomato

Portable spectrometers are promising tools that can be an alternative way, for various purposes, of analyzing food quality, such as monitoring in a few seconds the internal quality during fruit ripening in the field. A portable/handheld (palm-sized) near-infrared (NIR) spectrometer (Neospectra, Si-ware) with spectral range of 1295–2611 nm, equipped with a micro-electro-mechanical system (MEMs), was used to develop prediction models to evaluate tomato quality attributes non-destructively. Soluble solid content (SSC), fructose, glucose, titratable acidity (TA), ascorbic, and citric acid contents of different types of fresh tomatoes were analyzed with standard methods, and those values were correlated to spectral data by partial least squares regression (PLSR). Fresh tomato samples were obtained in 2018 and 2019 crops in commercial production, and four fruit types were evaluated: Roma, round, grape, and cherry tomatoes. The large variation in tomato types and having the fruits from distinct years resulted in a wide range in quality parameters enabling robust PLSR models. Results showed accurate prediction and good correlation (Rpred) for SSC = 0.87, glucose = 0.83, fructose = 0.87, ascorbic acid = 0.81, and citric acid = 0.86. Our results support the assertion that a handheld NIR spectrometer has a high potential to simultaneously determine several quality attributes of different types of tomatoes in a practical and fast way.

scholarly journals Nano-Crystallization of Ln-Fluoride Crystals in Glass-Ceramics via Inducing of Yb3+ for Efficient Near-Infrared Upconversion Luminescence of Tm3+

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1033
Author(s):  
Jianfeng Li ◽  
Yi Long ◽  
Qichao Zhao ◽  
Shupei Zheng ◽  
Zaijin Fang ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Near Infrared ◽  
Upconversion Luminescence ◽  
Glass Ceramics ◽  
Upconversion Emission ◽  
Ceramic Composites ◽  
Wide Range ◽  
Transmission Window ◽  
Optical Applications ◽  
Upconversion Emissions

Transparent glass-ceramic composites embedded with Ln-fluoride nanocrystals are prepared in this work to enhance the upconversion luminescence of Tm3+. The crystalline phases, microstructures, and photoluminescence properties of samples are carefully investigated. KYb3F10 nanocrystals are proved to controllably precipitate in the glass-ceramics via the inducing of Yb3+ when the doping concentration varies from 0.5 to 1.5 mol%. Pure near-infrared upconversion emissions are observed and the emission intensities are enhanced in the glass-ceramics as compared to in the precursor glass due to the incorporation of Tm3+ into the KYb3F10 crystal structures via substitutions for Yb3+. Furthermore, KYb2F7 crystals are also nano-crystallized in the glass-ceramics when the Yb3+ concentration exceeds 2.0 mol%. The upconversion emission intensity of Tm3+ is further enhanced by seven times as Tm3+ enters the lattice sites of pure KYb2F7 nanocrystals. The designed glass ceramics provide efficient gain materials for optical applications in the biological transmission window. Moreover, the controllable nano-crystallization strategy induced by Yb3+ opens a new way for engineering a wide range of functional nanomaterials with effective incorporation of Ln3+ ions into fluoride crystal structures.

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