Download or read book III V Multiple Quantum Well Long Wavelength Infrared Detectors written by Deepak Kumar Sengupta and published by . This book was released on 1997 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Long Wavelength Infrared Detectors Utilizing Multiple Quantum Wells in III V Compound Semiconductors written by Mark Alan Dodd and published by . This book was released on 1994 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data are presented on various infrared detectors based on multiple GaAs/AlGaAs quantum wells. Due to the great flexibility in the growth, dimensions, and composition of these structures, the electrical and optical characteristics of the photodetector may be significantly altered. This investigation explores both theoretically and experimentally the effect of modifying the well and barrier parameters. As GaAs/AlGaAs-based materials are prevalent in optical generation devices such as LEDs and lasers, it is natural to explore these materials' use for optical receivers as well. While most LEDs and lasers operate in the visible and near infrared (less than one micrometer), structures can operate to detect radiation with longer wavelengths. The simplest method to achieve longer wavelength absorption is through the use of quantum mechanical wells and their associated bound energy states. The energy level of the bound state may be changed by altering the well width or barrier composition. This allows one to tune the spectral response of the photodetector for a given application. Three fundamental classes of quantum well infrared detectors (QWIDs) are examined. Each of these n-type, well-doped structures has its merits and drawbacks. The bound-to-bound state energy class is shown to have low dark current but also low responsivity. The bound-to-continuum class results in high dark current, high responsivity detectors. The bound-to-miniband QWIDs have low dark currents and moderate responsivity. All three classes are explored in greater detail in an effort to increase responsivity. This was accomplished by altering the doping profile of the fundamental structure to include doping of the barrier. The results indicate that a factor of six increase is possible for the bound-to-continuum structure. An increase in operating temperature is an additional benefit of the revised doping profile. As QWIDs do not typically respond to normally incident radiation, an optical grating must be used to couple the radiation so that it may be absorbed. A variety of one- and two-dimensional gratings are studied, and their impact on performance is reported. The fabrication technique used to form the grating is also examined. A deposited metal grating with a thin gold overcoat was found to yield the most efficient coupling and, therefore, the highest responsivity.

Download or read book Long Wavelength Infrared Detectors written by Manijeh Razeghi and published by CRC Press. This book was released on 2020-03-09 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely work presents a comprehensive overview of the development of new generations of infrared detectors based on artificially synthesized quantum structures. The growth of quantum wells and superlattices is well documents in this volume, as are the principal new superlattice technologies for long wavelength infrared detection. Featuring insightful contributions from researchers working at the "cutting edge" of this exciting field, this volume is sure to become an essential reference for advanced graduate students and researchers alike.

Download or read book Proceedings of the Third International Symposium on Long Wavelength Infrared Detectors and Arrays Physics and Applications III written by Sheng S. Li and published by The Electrochemical Society. This book was released on 1995 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Research and Development written by and published by Elsevier. This book was released on 1995-11-22 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physics of Thin Films is one of the longest running continuing series in thin film science, consisting of twenty volumes since 1963. The series contains quality studies of the properties of various thinfilms materials and systems. In order to be able to reflect the development of today's science and to cover all modern aspects of thin films, the series, starting with Volume 20, has moved beyond the basic physics of thin films. It now addresses the most important aspects of both inorganic and organic thin films, in both their theoretical as well as technological aspects. Therefore, in order to reflect the modern technology-oriented problems, the title has been slightly modified from Physics of Thin Films to Thin Films. - Discusses the latest research about structure, physics, and infrared photoemissive behavior of heavily doped silicon homojunctions and Ge and GaAs-based alloy junctions - Reviews the current status of SiGe/Si quantum wells for infrared detection - Discusses key developments in the growing research on quantum-well infrared photodetectors (QWIPs) - Reviews Chois development of a family of novel three-terminal, multi-quantum well devices designed to improve high-temperature IR detectivity at long wavelengths - Describes recent studies aimed at using multi-quantum well structures to achieve higher performance in solar cell devices based on materials systems

Download or read book Proceedings of the First International Symposium on Long Wavelength Infrared Detectors and Arrays Physics and Applications written by Farhad Radpour and published by . This book was released on 1995 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Proceedings of the Fifth 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 1997 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Semiconductor Quantum Wells and Superlattices for Long wavelength Infrared Detectors written by Mahmoud Omar Manasreh and published by Artech House Materials Science. This book was released on 1993 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a basic understanding of how semiconductor quantum wells and superlattices can be used for long-wavelength infrared detectors and related systems. It represents a step towards a knowledge of novel structures that could be used for high-performance infrared detectors and imaging rays.

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 The Physics of Quantum Well Infrared Photodetectors written by K. K. Choi and published by World Scientific. This book was released on 1997 with total page 436 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 managing.

Download or read book Proceedings of the Second International Conference on Long Wavelength Infrared Dectectors and Arrays Physics and Applications written by V. Swaminathan and published by The Electrochemical Society. This book was released on 1995 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Expanding the Vision of Sensor Materials written by Committee on New Sensor Technologies: Materials and Applications and published by National Academies Press. This book was released on 1995-07-06 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in materials science and engineering have paved the way for the development of new and more capable sensors. Drawing upon case studies from manufacturing and structural monitoring and involving chemical and long wave-length infrared sensors, this book suggests an approach that frames the relevant technical issues in such a way as to expedite the consideration of new and novel sensor materials. It enables a multidisciplinary approach for identifying opportunities and making realistic assessments of technical risk and could be used to guide relevant research and development in sensor technologies.

Download or read book Handbook of Nanostructured Materials and Nanotechnology Five Volume Set written by Hari Singh Nalwa and published by Academic Press. This book was released on 1999-10-29 with total page 3593 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured materials is one of the hottest and fastest growing areas in today's materials science field, along with the related field of solid state physics. Nanostructured materials and their based technologies have opened up exciting new possibilites for future applications in a number of areas including aerospace, automotive, x-ray technology, batteries, sensors, color imaging, printing, computer chips, medical implants, pharmacy, and cosmetics. The ability to change properties on the atomic level promises a revolution in many realms of science and technology. Thus, this book details the high level of activity and significant findings are available for those involved in research and development in the field. It also covers industrial findings and corporate support. This five-volume set summarizes fundamentals of nano-science in a comprehensive way. The contributors enlisted by the editor are at elite institutions worldwide. Key Features * Provides comprehensive coverage of the dominant technology of the 21st century * Written by 127 authors from 16 countries, making this truly international * First and only reference to cover all aspects of nanostructured materials and nanotechnology

Download or read book Infrared Detectors and Emitters Materials and Devices written by Peter Capper and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date view of the various detector/emitter materials systems currently in use or being actively researched. The book is aimed at newcomers and those already working in the IR industry. It provides both an introductory text and a valuable overview of the entire field.