Download or read book Modeling of Transport and Gain in Quantum Cascade Lasers written by and published by . This book was released on 2014 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transport in Quantum Cascade Lasers written by Romain Terazzi and published by LAP Lambert Academic Publishing. This book was released on 2012-07 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: The simulation of transport in semiconductor heterostructures like quantum cascade lasers is of central interest as it enables the knowledge of the electrons dynamics inside such structures, allowing the determination of electrical and optical properties of the latter. These human-designed structures have an atomic resolution and therefore require a quantum mechanical description. The latter can be performed at different levels. The basic description gives the band-structure that represents where electrons can exist in the structure. However this description does not provide information about the transport properties, as the latter require the knowledge of the interaction of electrons with various sources of scattering inside the structure. In this work we present an effective transport model that relies both on coherent and incoherent transport processes.
Download or read book Handbook of Optoelectronic Device Modeling and Simulation written by Joachim Piprek and published by CRC Press. This book was released on 2017-10-12 with total page 887 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive survey of fundamental concepts and methods for optoelectronic device modeling and simulation. Gives a broad overview of concepts with concise explanations illustrated by real results. Compares different levels of modeling, from simple analytical models to complex numerical models. Discusses practical methods of model validation. Includes an overview of numerical techniques.
Download or read book Quantum Cascade Lasers written by Jérôme Faist and published by Oxford University Press. This book was released on 2013-03-14 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the physics, fabrication technology, and applications of the quantum cascade laser.
Download or read book Electro optical and Coherent Transport Modelling of Quantum Cascade Lasers written by Gabriel Beji and published by . This book was released on 2011 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mid Infrared and Terahertz Quantum Cascade Lasers written by Dan Botez and published by Cambridge University Press. This book was released on 2023-06-30 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: A state-of-the-art overview of this rapidly expanding field, featuring fundamental theory, practical applications, and real-life examples.
Download or read book Design and Modeling of High Temperature Terahertz Quantum Cascade Lasers written by Benjamin Adams Burnett and published by . This book was released on 2016 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: The portion of the electromagnetic spectrum between roughly 300 GHz and 10 THz is nicknamed the "THz Gap" because of the enormous difficulty encountered by researchers to devise practical sources covering it. Still, the quantum cascade laser (QCL) has emerged over recent years as the most promising approach to a practical source in the 1-5 THz range. First developed in the higher-frequency mid-IR, where they are now widely available, QCLs were later extended to the THz where a host of greater design challenges awaited. Lasing in QCLs is based on intersubband optical transitions in semiconductor quantum wells, the energy of which can be chosen by design ("bandstructure engineering"). However, simply building a THz optical transition is insufficient; a good design must also produce significant population inversion by the applied cascading electron current, and this requires deep understanding of the transport physics. So far, no THz QCL has operated above the temperature of 200 K, even though the reasons prohibiting high temperature operation are well known. The goal of this Thesis is to put novel ideas for high-temperature operation of THz QCL active regions through rigorous theoretical testing. The central enabling development is a density-matrix-based model of transport and optical properties tailored for use in QCLs, which is general enough that widely varying design concepts can be tested using the same core principles. Importantly, by simulating QCLs more generally, fewer a priori assumptions are required on part of the researcher, allowing for the true physics to emerge on its own. It will be shown that this gives rise to new and useful insights that will help to guide the experimental efforts towards realization of these devices. One specific application is a quantum dot cascade laser (QDCL), a highly ambitious approach in which the electrons cascade through a series of quantum dots rather than wells. Benefits are expected due to the suppression of nonradiative scattering, brought about by the discrete spectrum of electronic states. However, this in turn leads to a highly different physics of transport and effects that are not well understood, even in the case of perfect materials. This work will show that while the benefits are clear, naive scaling of existing QCL designs to the quantum dot limit will not work. An alternative strategy is given based on a revised understanding of the nature of transport, and is put to a test of practicality in which the effects of quantum dot size inhomogeneity are estimated. Another application is to the already existing method of THz difference frequency generation in mid-IR QCLs, which occurs via a difference-frequency susceptibility $\chi^{(2)}$ in the active region itself. For this purpose, the model is extended to enable a coherent and nonperturbative calculation of optical nonlinearities. First, the generality of the method is displayed through the emergence of exotic nonlinear effects, including electromagnetically-induced transparency, in mock quantum-well systems. Then, the modeling concepts are applied to the real devices, where two new and important mechanisms contributing to $\chi^{(2)}$ are identified. Most importantly, it is predicted that the QCL acts as an extremely fast photodetector of itself, giving rise to a current response to the mid-IR beatnote that provides a better path forward to the generation of frequencies below ~2 THz. Finally, the fundamentals of density matrix transport theory for QCLs are revisited to develop a model for conventional THz QCL designs eliminating the usual phenomenological treatment of scattering. The new theory is fully developed from first principles, and in particular sheds light on the effects of scattering-induced electron localization. The versatility of the model is demonstrated by successful simulation of varying active region designs.
Download or read book Electro optical and Coherent Transport Modelling of Quantum Cascade Lasers written by Gabriel Beji and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Solid State Physics written by Bernhard Kramer and published by Springer Science & Business Media. This book was released on 2003-09-22 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 43 of Advances in Solid State Physics contains the written versions of most of the plenary and invited lectures of the Spring Meeting of the Condensed Matter Physics section of the Deutsche Physikalische Gesellschaft held from March 24 to 28, 2003 in Dresden, Germany. Many of the topical talks given at the numerous and very lively symposia are also included. They covered an extremely interesting selection of timely subjects. Thus the book truly reflects the status of the field of solid state physics in 2003, and explains its attractiveness, not only in Germany but also internationally.
Download or read book Mid infrared Optoelectronics written by Eric Tournié and published by Woodhead Publishing. This book was released on 2019-10-19 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mid-infrared Optoelectronics: Materials, Devices, and Applications addresses the new materials, devices and applications that have emerged over the last decade, along with exciting areas of research. Sections cover fundamentals, light sources, photodetectors, new approaches, and the application of mid-IR devices, with sections discussing LEDs, laser diodes, and quantum cascade lasers, mid-infrared optoelectronics, emerging research areas, dilute bismide and nitride alloys, Group-IV materials, gallium nitride heterostructures, and new nonlinear materials. Finally, the most relevant applications of mid-infrared devices are reviewed in industry, gas sensing, spectroscopy, and imaging. This book presents a key reference for materials scientists, engineers and professionals working in R&D in the area of semiconductors and optoelectronics. - Provides a comprehensive overview of mid-infrared photodetectors and light sources and the latest materials and devices - Reviews emerging areas of research in the field of mid-infrared optoelectronics, including new materials, such as wide bandgap materials, chalcogenides and new approaches, like heterogeneous integration - Includes information on the most relevant applications in industry, like gas sensing, spectroscopy and imaging
Download or read book Analysis of the Electron Transport Properties in Quantum Cascade Lasers written by Hans Callebaut and published by . This book was released on 2006 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) A model was developed for e-e scattering, which produced thermalized subband electron distributions. In addition, several quantum-cascade devices were simulated and the calculation results were compared to the DM Monte Carlo results and measurements. We find that, while the NEGF simulations with momentum-dependent scattering matrix elements and e-e scattering predict the most accurate results, the simple NEGF simulation originally implemented by Wacker and the DM simulation can also yield acceptable results at a much reduced computational expense.
Download or read book Nanoelectronics Devices Design Materials and Applications Part II written by Gopal Rawat and published by Bentham Science Publishers. This book was released on 2023-11-28 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoelectronics Devices: Design, Materials, and Applications provides information about the progress of nanomaterial and nanoelectronic devices and their applications in diverse fields (including semiconductor electronics, biomedical engineering, energy production and agriculture). The book is divided into two parts. The editors have included a blend of basic and advanced information with references to current research. The book is intended as an update for researchers and industry professionals in the field of electronics and nanotechnology. It can also serve as a reference book for students taking advanced courses in electronics and technology. The editors have included MCQs for evaluating the readers’ understanding of the topics covered in the book. Topics Covered in Part 2 include applications of nanoelectronics for different devices and materials. - Photonic crystal waveguide geometry - 8kW to 80kW power grids with simple energy storage systems - Two-dimensional material and based heterojunctions like MoS2 /graphene, MoS2 /CNT, and MoS2 /WS2, - 5G communication material - Wearable devices like electronic skin, intelligent wound bandages, tattoo-based electrochemical sensors - PEDOT: PSS-based EEG - New materials for medicine
Download or read book The Non Equilibrium Green s Function Method for Nanoscale Device Simulation written by Mahdi Pourfath and published by Springer. This book was released on 2014-07-05 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: For modeling the transport of carriers in nanoscale devices, a Green-function formalism is the most accurate approach. Due to the complexity of the formalism, one should have a deep understanding of the underlying principles and use smart approximations and numerical methods for solving the kinetic equations at a reasonable computational time. In this book the required concepts from quantum and statistical mechanics and numerical methods for calculating Green functions are presented. The Green function is studied in detail for systems both under equilibrium and under nonequilibrium conditions. Because the formalism enables rigorous modeling of different scattering mechanisms in terms of self-energies, but an exact evaluation of self-energies for realistic systems is not possible, their approximation and inclusion in the quantum kinetic equations of the Green functions are elaborated. All the elements of the kinetic equations, which are the device Hamiltonian, contact self-energies and scattering self-energies, are examined and efficient methods for their evaluation are explained. Finally, the application of these methods to study novel electronic devices such as nanotubes, graphene, Si-nanowires and low-dimensional thermoelectric devices and photodetectors are discussed.
Download or read book Mid Infrared and Terahertz Quantum Cascade Lasers written by Dan Botez and published by Cambridge University Press. This book was released on 2023-09-14 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn how the rapidly expanding area of mid-infrared and terahertz photonics has been revolutionized in this comprehensive overview. State-of-the-art practical applications are supported by real-life examples and expert guidance. Also featuring fundamental theory enabling you to improve performance of both existing and future devices.
Download or read book Simulation of Semiconductor Processes and Devices 2007 written by Tibor Grasser and published by Springer Science & Business Media. This book was released on 2007-11-18 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the 12th International Conference on Simulation of Semiconductor Processes and Devices, SISPAD 2007, held September 2007 in Vienna, Austria. It provides a global forum for the presentation and discussion of recent advances and developments in the theoretical description, physical modeling and numerical simulation and analysis of semiconductor fabrication processes, device operation and system performance.
Download or read book Modeling of Quantum Cascade Lasers written by Mihai Ursu and published by . This book was released on 2001 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computer Supported Cooperative Work written by Uwe M. Borghoff and published by Springer Science & Business Media. This book was released on 2000-07-14 with total page 1342 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed introduction to interdisciplinary application area of distributed systems, namely the computer support of individuals trying to solve a problem in cooperation with each other but not necessarily having identical work places or working times. The book is addressed to students of distributed systems, communications, information science and socio-organizational theory, as well as to users and developers of systems with group communication and cooperation as top priorities.
