Low noise, near-infrared APDs for laser wavefront monitoring

2019 ◽  
Author(s):  
Sri Harsha Kodati ◽  
Seunghyun Lee ◽  
Theodore J. Ronningen ◽  
Martin Winslow ◽  
Christoph Grein ◽  
...  
Keyword(s):  
Near Infrared ◽  
Low Noise

Infrared and Visible—Near Infrared Electroluminescence Developments for FA in AlGaN/GaN HEMTS on SiC

2010 ◽  
Author(s):  
M. Bouya ◽  
D. Carisetti ◽  
J.C. Clement ◽  
N. Malbert ◽  
N. Labat ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Near Infrared ◽  
High Electron Mobility Transistor ◽  
Low Noise ◽  
Civil Defense ◽  
Base Stations ◽  
Infrared Range ◽  
High Electron ◽  
Radar Applications ◽  
Gan Hemts

Abstract HEMT (High Electron Mobility Transistor) are playing a key role for power and RF low noise applications. They are crucial components for the development of base stations in the telecommunications networks and for civil, defense and space radar applications. As well as the improvement of the MMIC performances, the localization of the defects and the failure analysis of these devices are very challenging. To face these challenges, we have developed a complete approach, without degrading the component, based on front side failure analysis by standard (Visible-NIR) and Infrared (range of wavelength: 3-5 µm) electroluminescence techniques. Its complementarities and efficiency have been demonstrated through two case studies.

scholarly journals Infrared detector activities at NASA Langley Research Center

2008 ◽  
Vol 1076 ◽  
Author(s):  
M. Nurul Abedin ◽  
Tamer F Refaat ◽  
Oleg V Sulima ◽  
Farzin Amzajerdian
Keyword(s):  
Remote Sensing ◽  
Near Infrared ◽  
Infrared Detector ◽  
Avalanche Photodiode ◽  
Low Noise ◽  
Focal Plane Arrays ◽  
Research Center ◽  
Single Element ◽  
Sensing Applications ◽  
Langley Research Center

ABSTRACTInfrared detector development and characterization at NASA Langley Research Center will be reviewed. These detectors were intended for ground, airborne, and space borne remote sensing applications. Discussion will be focused on recently developed single-element infrared detector and future development of near-infrared focal plane arrays (FPA). The FPA will be applied to next generation space-based instruments. These activities are based on phototransistor and avalanche photodiode technologies, which offer high internal gain and relatively low noise-equivalent-power. These novel devices will improve the sensitivity of active remote sensing instruments while eliminating the need for a high power laser transmitter.

scholarly journals A Complete Two-Dimensional Avalanche Photodiode Based on MoTe2−WS2−MoTe2 Heterojunctions With Ultralow Dark Current

2021 ◽  
Vol 8 ◽  
Author(s):  
Tenghui Ouyang ◽  
Ximiao Wang ◽  
Shaojing Liu ◽  
Huanjun Chen ◽  
Shaozhi Deng
Keyword(s):  
Dark Current ◽  
Near Infrared ◽  
Transition Metal Dichalcogenides ◽  
High Sensitivity ◽  
Avalanche Photodiode ◽  
Infrared Region ◽  
Low Noise ◽  
Two Dimensional ◽  
Device Structure ◽  
Avalanche Gain

Two-dimensional (2D)-material-based photodetectors have recently received great attention due to their potentials in developing ultrathin and highly compact devices. Avalanche photodiodes (APDs) are widely used in a variety of fields such as optical communications and bioimaging due to their fast responses and high sensitivities. However, conventional APDs based on bulk materials are limited by their relatively high dark current. One solution to tackle this issue is by employing nanomaterials and nanostructures as the active layers for APDs. In this study, we proposed and fabricated an atomically-thick APD based on heterojunctions formed by 2D transition metal dichalcogenides (TMDs). A typical device structure was formed by stacking a semiconducting monolayer WS2 onto two metallic few-layer MoTe2 flakes. Due to the Schottky barrier formed between the TMD layers and their atomic thicknesses, the dark current of the APD is greatly reduced down to 93 pA. In addition, the APD can operate through a broad spectral range from visible to near-infrared region, with a responsivity of 6.02 A/W, an external quantum efficiency of 1,406%, and an avalanche gain of 587. We believe that the 2D APD demonstrated here provides a feasible approach for developing all-2D optoelectronic devices with simultaneous high-sensitivity and low noise.

Atmospheric Correction of Satellite Optical Imagery over the Río de la Plata Highly Turbid Waters Using a SWIR-Based Principal Component Decomposition Technique

2021 ◽  
Vol 13 (6) ◽  
pp. 1050
Author(s):  
Juan Ignacio Gossn ◽  
Robert Frouin ◽  
Ana Inés Dogliotti
Keyword(s):  
Principal Components ◽  
Near Infrared ◽  
Atmospheric Correction ◽  
Low Noise ◽  
Optical Data ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Turbid Waters ◽  
The Impact

Estimating water reflectance accurately from satellite optical data requires implementing an accurate atmospheric correction (AC) scheme, a particularly challenging task over optically complex water bodies, where the signal that comes from the water prevents using the near-infrared (NIR) bands to separate the perturbing atmospheric signal. In the present work, we propose a new AC scheme specially designed for the Río de la Plata—a funnel-shaped estuary in the Argentine–Uruguayan border—highly scattering turbid waters. This new AC scheme uses far shortwave infrared (SWIR) bands but unlike previous algorithms relates the atmospheric signal in the SWIR to the signal in the near-infrared (NIR) and visible (VIS) bands based on the decomposition into principal components of the atmospheric signal. We describe the theoretical basis of the algorithm, analyze the spectral features of the simulated principal components, theoretically address the impact of noise on the results, and perform match-ups exercises using in situ measurements and Moderate Resolution Imaging Spectrometer (MODIS) and Visible Infrared Imaging Radiometer Suite (VIIRS) imagery over the region. Plausible water reflectance retrievals were obtained in the NIR and VIS bands from both simulations and match-ups using field data—with better performance (i.e., lowest errors and offsets, and slopes closest to 1) compared to existing AC schemes implemented in the NASA Data Analysis Software (SeaDAS). Moreover, retrievals over images in the VIS and NIR bands showed low noise, and the correlation was low between aerosol and water reflectance spatial fields.

scholarly journals Low-noise, high-brightness, tunable source of picosecond pulsed light in the near-infrared and visible

2011 ◽  
Vol 19 (25) ◽  
pp. 25337 ◽  
Author(s):  
Peter J. Mosley ◽  
Samuel A. Bateman ◽  
Laure Lavoute ◽  
William J. Wadsworth
Keyword(s):  
Near Infrared ◽  
Low Noise ◽  
Pulsed Light ◽  
High Brightness ◽  
Tunable Source

Photoacoustic medical imaging demonstration using a pulsed LED

2021 ◽  
Vol 263 (5) ◽  
pp. 1756-1764
Author(s):  
Leah Burge ◽  
Lauryn McKenna ◽  
Murray Korman
Keyword(s):  
Medical Imaging ◽  
Near Infrared ◽  
Yttrium Aluminum Garnet ◽  
Capillary Tube ◽  
Light Emitting Diode ◽  
Cost Effective ◽  
Ultrasonic Pulse ◽  
Low Noise ◽  
Rapid Expansion ◽  
India Ink

This demonstration of photoacoustics involves a focused light-emitting diode (LED) pulse (620 nm wavelength) which illuminates an optically absorbing target. The rapid expansion generates an ultrasonic pulse detected by an immersion transducer. An LED is a cost-effective alternative to the traditional neodymium-doped Yttrium-Aluminum Garnet (Nd:YAG) laser and laser diode- that is most effective in near-infrared. The LED is driven by a home-made MOSFET driver capable of 100 A pulses. Focused pulses illuminate a horizontal 1.2 mm capillary tube filled with Fast Green Dye. A highly-diffuse Teflon cylindrical cavity (9 cm tall, 6 cm diam) contains the mounted capillary tube. A 2.25 MHz immersion transducer with four low-noise amplifier gain blocks (combined 86 decibel gain, 0.5- 30 MHz bandwidth), detects a time-averaged signal from over 1000 trials. Comparisons are made using India ink. Earlier, T. J. Allen and P. C. Beard used 35 percent hematocrit blood in a capillary tube at a 620 nm wavelength demonstrating the feasibility of photoacoustic medical imaging of vascular systems under the skin or shallow-tissue cancerous tumors (using tomography) as an alternative to radioactive medical imaging. Our work precedes a photoacoustic tomography demonstration using three targets in an open acrylic tank.

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