Download or read book A New Two Color Infrared Photodetector Design Using INGAAS INALAS Coupled Quantum Wells written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Army Research Laboratory (ARL) in collaboration with a number of industry and university partners is developing a new generation of sensors that can perform advanced signal processing functions over a very wide range of wavelengths (e.g. from the ultraviolet to the millimeter-wave region of the spectrum).
Download or read book Investigation of Multicolor and Simplified Quantum Well Infrared Photodetectors for MWIR and LWIR Detection written by and published by . This book was released on 2000 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research program, we have investigated a four-stack, four-color quantum well infrared photodetector (QWIP), and studied the voltage distribution and temperature effect in this four-color QWIP. We have conducted a study on the quantum confined Stark-effect in an n-type QWIP. We have performed theoretical studies of the intersubband optical transitions in quantum dots and the design of GaAs/InGaAs and InAs/InAlAs quantum dot infrared photodetectors (QDIPs) for MWIR and LWIR detection. A new QWIP for very long wavelength infrared (VLWIR) applications has been investigated for 14-16 (micrometer) detection. Specific issues concerning device physics, detector design and device performance of the VLWIR QWIP are addressed. A VLWIR QWIP has been designed, fabricated and characterized. Two high performance multi-color, broadband QWIPs using digital graded superlattice barriers (DGSLB) for long wavelength infrared (LWIR) and broadband (BB) infrared detection have been demonstrated. We have also developed a high performance broadband (BB) In(0.26) Ga(0.74) As/Al(x) Ga(1-x)As QWIP using a linearly graded (LGB) Al(x) Ga(1-x) As barrier for LWIR detection. Theoretical study on the enhancement of quantum efficiency in a QWIP by using photonic crystal structure has also been carried out in this report.
Download or read book New Ternary Alloy Systems for Infrared Detectors written by Antoni Rogalski and published by SPIE Press. This book was released on 1994 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of High Performance Multicolor Quantum Well Infrared Photodetectors and Studies of Enhancing Light Coupling and Radiation Effects in QWIPs written by and published by . This book was released on 1999 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report, we present the design, fabrication, and characterization of several high performance multi-color and broadband quantum well infrared photodetectors (QWIPs) for both MWIR and LWIR applications. The report covers tasks performed during the period from March 3, 1998 through July 10, 1999. A very high sensitivity, high-strain, multi-color triple-coupled (TC-) QWIP using InGaAs/AlGaAs/InGaAs material systems has been developed in this project for LWIR multi-color detection. A two-stack InGaAs/AlGaAs/InGaAs TC-QWIP and InGaAs/AlGaAs TC-QWIP has been developed for the LWIR and MWIR dual-band detection. In addition, a high-strain InGaAs/GaAs TC-QWIP with and without two-dimensional (2-D) grating coupler has been designed, fabricated, and characterized for the LWIR detection. This device shows very high responsivity under 450 back-illumination. Several broadband (BB-) QWIPs have been developed for the LWIR detection. These include (1) two-stack, five-well n-type InGaAs/AlGaAs broadband (BB-) QWIPs with 3- and 7-period QWs in the unit cell, (2) 3- and 4-well n-type BB-QWIPs, and (3) two 3- and 4- well p-type BB-QWIPs. In addition, a three-stack InGaAs/AlGaAs/InGaAs BB TC-QWIP grown on GaAs substrate has been developed for LWIR detection, which has a FWHM spectral bandwidth twice larger than the single-stack TC-QWIP. Finally, a MWIR InGaAs/InAlAs TC-QWIP grown on InP substrate, operating up to T = 116K with excellent device performance, has also been demonstrated. Four journal papers and six conference papers have been published and presented from this work.
Download or read book Infrared and Terahertz Detectors Third Edition written by Antoni Rogalski and published by CRC Press. This book was released on 2019-01-10 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of Infrared and Terahertz Detectors provides a comprehensive overview of infrared and terahertz detector technology, from fundamental science to materials and fabrication techniques. It contains a complete overhaul of the contents including several new chapters and a new section on terahertz detectors and systems. It includes a new tutorial introduction to technical aspects that are fundamental for basic understanding. The other dedicated sections focus on thermal detectors, photon detectors, and focal plane arrays.
Download or read book Two Color Photodetector Using an Asymmetric Quantum Well Structure written by Kevin R. Lantz and published by . This book was released on 2002-06 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past twenty years have seen an explosion in the realm of infrared detection technology fueled by improvements in III-V semiconductor technology and by new semiconductor growth methods. One of the fastest growing areas of this research involves the use of bandgap engineering in order to create artificial quantum wells for use in Quantum Well Infrared Photodetectors (QWIPs) . QWIPs have an advantage over other infrared detectors such as Mercury Cadmium Telluride (MCT) because they have larger bandgaps and are therefore stronger and cheaper to manufacture. This thesis introduces one method of multi-color' detection through the use of an asymmetries quantum well structure in which all energy transitions are possible. The QWIP structure in this thesis was designed to detect a laser wavelength of 1.06 micrometers and a wavelength in the 8-10 micrometers atmosphere window. The relevance of a detector that is tuned to these wavelengths is that it can be used on military aircraft as a laser spot tracker and an infrared imager providing much greater accuracy and dependability than older systems.
Download or read book The Physics Of Quantum Well Infrared Photodetectors written by Kwong-kit Choi and published by World Scientific. This book was released on 1997-06-12 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past, infrared imaging has been used exclusively for military applications. In fact, it can also be useful in a wide range of scientific and commercial applications. However, its wide spread use was impeded by the scarcity of the imaging systems and its high cost. Recently, there is an emerging infrared technology based on quantum well intersubband transition in III-V compound semiconductors. With the new technology, these impedances can be eliminated and a new era of infrared imaging is in sight. This book is designed to give a systematic description on the underlying physics of the new detectors and other issues related to infrared imaging.
Download or read book Observation of Quantum Confined Stark Effect in Triple Coupled InGaAs GaAs AlGaAs Quantum Well Infrared Photodetector written by and published by . This book was released on 1997 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have investigated the quantum-confined Stark effect (QCSE) in several n-type InGaAs/GaAs/AlGaAs triple-coupled quantum well infrared photodetectors (TC-QWIPs) for 8-12 micrometers long wavelength infrared (LWIR) detection. The basic structure of this TC-QWIP consists of three coupled quantum wells (QWs) formed by a Si-doped In(x)Ga(1-x)As QW and two undoped thin GaAs QWs separated by two thin Al(y)Ga(1-y)As barriers. Three TC-QWIP devices with varying indium and aluminum compositions were fabricated and characterized. A strong QCSE for the (E1 to E3) transition was observed in the wavelength range of 8.2 - 9.1 micrometers, 10.8 - 11.5 micrometers, and 9.4 - 10.7 micrometers for QWIP-A, -B, and -C, respectively. These devices exhibit a linear dependence of peak wavelength on the applied bias voltage over these wavelengths ranges. Peak responsivities, R(1) = 0.05, 0.33 A/W and detectivities, D*(BLIP) = 6.1x10(exp9), l.63x10(exp10)cm-Hz(1/2)/W at V(b)=5, 4 V, lamba(p)=8.6, 11.2 micrometers, and T(BLIP)=66, 50 K were obtained for QWIP-A and -B, respectively. For QWIP-C, R(1)=0.19 A/W was obtained at lamba(p)=9.3 micrometers, V(b)=7 V, and T+60 K.
Download or read book Multi Color Quantum Well Infrared Photodetectors for Mid Long and Very Long Wavelength Infrared Applications written by Sheng S. Li and published by . This book was released on 2002 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum well infrared photodetectors (QWIPs) have been widely investigated for the 3 - 5 micrometers mid-wavelength infrared (MWIR) and 8 - 12 micrometers long-wavelength infrared (LWIR) atmospheric spectral windows as well as very long wavelength infrared (VLWIR: lambda(sub c)> 14 micrometers) detection in the past decade. The mature III-V compound semiconductor growth technology and the design flexibility of device structures have led to the rapid development of various QWIP structures for infrared focal plane arrays (FPAs) applications. In addition to the single-color QWIP with narrow bandwidth, the multi-color QWIP required for advanced IR sensing and imaging applications have also been emerged in recent years. Using band gap engineering approach, the multi-color (2, 3, and 4- color) QWIPs using multi-stack quantum wells with different well width and depth and voltage-tunable triple-coupled quantum well (TCQW) structure for detection in the MWIR, LWIR, and VLWIR bands have been demonstrated. In this paper, the design, fabrication, and characterization of a voltage-tunable 2-stack 3-color QWIP for MW/LW/LW IR detection and a 3-stack 3-color QWIP for detection in the water, ozone, and CO2 atmospheric blocking bands are depicted.
Download or read book Optical Engineering written by and published by . This book was released on 2003 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publishes papers reporting on research and development in optical science and engineering and the practical applications of known optical science, engineering, and technology.
Download or read book Intersubband Infrared Photodetectors written by Victor Ryzhii and published by World Scientific. This book was released on 2003-06-25 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infrared technologies are very important for a wide range of military, scientific and commercial applications. Devices and systems based on semiconductor heterostructure and quantum well and quantum dot structures open up a new era in infrared technologies.This book deals with various topics related to the latest achievements in the development of intersubband infrared photodetectors, reviewed by top experts in the field. It covers physical aspects of the operation of the devices as well as details of their design in different applications. The papers included in the book will be useful for researchers and engineers interested in the physics of optoelectronic devices as well as their practical design and applications.
Download or read book Intersubband Transitions in Strained InGaAs Quantum Wells for Multi color Infrared Detector Applications written by Clayton Lee Workman and published by . This book was released on 2002 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infrared Technology and Applications written by and published by . This book was released on 2001 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials for Infrared Detectors written by and published by . This book was released on 2001 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Sixth International Symposium on Long Wavelength Infrared Detectors and Arrays Physics and Applications written by Sheng S. Li and published by The Electrochemical Society. This book was released on 1999 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Noise Characteristics of Superlattice Energy Filters and Multi Color Infrared Detection Using Quantum Well Microstructure written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the result from a systematic study on a new device structure, the corrugated quantum well infrared photodetector (C-QWIP), which is designed to couple normal incident radiation into the quantum well structures. The C-QWIP structure is an array of QWIP wires with slant sidewalls, fabricated by etching V-grooves through the detector active region down to the bottom contact. It utilizes total internal reflection at the sidewalls of these QWIP wires to create favorable optical polarization for absorption. We have demonstrated that it has higher coupling efficiency in comparison with the standard 45 deg edge coupled device. Also, the coupling efficiency is independent of pixel size and wavelength. In addition, due to partial removal of the active material, the dark current of the detector is reduced significantly. The combination of photocurrent increase and dark current decrease results in a larger photocurrent to dark current ratio rI, and thus a higher D() and a smaller NEdeltaT in array applications.
Download or read book Comparison of Single Well and Double and Triple Coupled Well Quantum Well Infrared Photodetector Designs written by and published by . This book was released on 1998 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comparison is presented between three GaAs/AlGaAs quantum well infrared photodetector (QWIP) designs: the conventional single well and two coupled well designs, one containing two wells per period and the other three. Three QWIP detector test arrays have the same quantum well width, barrier thickness, doping density in each well, and a peak wavelength of 8.7 m. The detector array test structures used edge coupling to remove the grating or optical coupling structure effects from the detector response characteristics. Extensive temperature, bias and spectral dependent blackbody response and specific detectivity data are presented. The data show that coupled well designs offer both higher quantum efficiency and lower dark current than the more conventional single well QWIP.
