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Author :
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (958 download)
Download or read book Terahertz Quantum Cascade Laser Integration with On-chip Micromachined Rectangular Waveguides written by and published by . This book was released on 2009 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integration of a Terahertz Quantum Cascade Laser with a Hollow Waveguide written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present invention is directed to the integration of a quantum cascade laser with a hollow waveguide on a chip to improve both the beam pattern and manufacturability. By coupling the QCL output into a single-mode rectangular waveguide the radiation mode structure can be known and the propagation, manipulation, and broadcast of the QCL radiation can then be entirely controlled by well-established rectangular waveguide techniques. By controlling the impedance of the interface, enhanced functions, such as creating amplifiers, efficient coupling to external cavities, and increasing power output from metal-metal THz QCLs, are also enabled.
Author : Partia Naghibi Mahmoudabadi
Publisher :
ISBN 13 :
Total Pages : 93 pages
Book Rating : 4.:/5 (851 download)
Download or read book THz Quantum Cascade Lasers written by Partia Naghibi Mahmoudabadi and published by . This book was released on 2013 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The terahertz region of electromagnetic wave spectrum spanning from 300 GHz to 10 THz (the transition from electronics to photonics) has recently attracted considerable attention based on its numerous applications in different fields. Quantum cascade lasers (QCLs) have been developed in the past ten years as important sources of terahertz radiation. However, there still remain challenges to overcome such as room-temperature operation, efficient out-coupled power and directive radiative beam pattern. Achieving these goals will make THz QCLs very special sources of light to be utilized in broad range of applications in astronomy, biology, medical imaging, etc. This research tackles the aforementioned challenges in two sections. First, it targets the room-temperature issue by focusing on active region engineering and utilizing GaN/AlGaN quantum wells instead of the conventional GaAs/AlGaAs heterostructure QCLs. Second, it introduces a novel approach in waveguide engineering by harnessing the transmission line theory in order to improve the out-coupled power and radiation beam pattern.
Author : Adam Klimont
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)
Download or read book Novel Waveguides for Terahertz Quantum Cascade Lasers written by Adam Klimont and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ningren Han
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (868 download)
Download or read book Electrically Tunable Terahertz Quantum Cascade Lasers written by Ningren Han and published by . This book was released on 2013 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, microelectromechanical systems (MEMS) assisted electrically tunable terahertz quantum cascade lasers (THz QCLs) are designed and demonstrated. Two MEMS tuner devices are proposed to achieve electrically tunable THz QCLs. One is the electrostatic comb drive actuated tuner design and the other one is a two-stage flexure design that is actuated by an external piezo nano-positioning actuator. The MEMS tuner devices are all fabricated using standard foundry process SOIMUMPs from MEMSCAP Inc. with some additional in-house post-processings. First order distributed-feedback (DFB) THz wire QCLs with robust mode selectors are designed and fabricated at the MIT Microsystems Technology Laboratories (MTL) using processes developed at our group. By integrating the MEMS tuner chips with the THz QCL chips, broadband electrically tunable THz QCLs are successfully demonstrated. This thesis work provides an important step towards realizing turn-key tunable THz coherent sources for a variety of applications such as THz spectroscopy and THz coherent tomography.
Author :
Publisher :
ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (958 download)
Download or read book Integration of Terahertz Quantum Cascade Lasers for Use as Local Oscillators written by and published by . This book was released on 2009 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mohammed Salih
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (86 download)
Download or read book Development of Terahertz Frequency Quantum Cascade Laser written by Mohammed Salih and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: THz QCLs, based on a three-well resonant-phonon depopulation active region design, have been studied in depth using semi-insulating surface plasmon waveguides. Lasing frequencies between 2.3 to 4.0 THz have been investigated, together with a detailed evaluation of the effect of cavity length on devices performance. The effect of reducing the thickness of the THz QCL active region from 10 to 5 IJm was investigated, and the influence of active region thickness on lattice temperatures compared. Thinner active regions potentially make it possible to obtain continuous-wave (CW) operation from three-well, resonant-phonon depopulation QCLs, which is a requirement for many applications. It was demonstrated that the laser cavity of edge-emitting THz QCLs could be defined using an etched rather than a cleaved facet. Three emission frequencies ( - 3.0, - 3.5 and - 4.0 THz) with two different facet angles (et:> = - 50° and et:> = - 42°) were studied and device performance were compared. The new THz QCL devices with sloped facets could open up the possibility of monolithic integration of QCLs into terahertz circuits. They also remove the requirement for THz QCLs to be fabricated perpendicular to cleavage planes of the underlying crystal structure. From the demonstration of lasing from THz QCLs with angled facets, the possibility of coupling surface acoustic waves (SAWs) with THz QCLs is investigated. The aim was to use SAWs propagating through upper surface of the waveguide of the THz QCL to introduce modulation of the gain region. This would have significant application to spectroscopy at THz frequencies. SAW propagate across a QCL mesa was demonstrated, and fully investigated devices were fabricated and tested.
Author : Owen Peter Marshall
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (89 download)
Download or read book Terahertz Quantum Cascade Lasers written by Owen Peter Marshall and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rainee N. Simons
Publisher : John Wiley & Sons
ISBN 13 : 0471463930
Total Pages : 461 pages
Book Rating : 4.4/5 (714 download)
Download or read book Coplanar Waveguide Circuits, Components, and Systems written by Rainee N. Simons and published by John Wiley & Sons. This book was released on 2004-04-07 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: Up-to-date coverage of the analysis and applications of coplanar waveguides to microwave circuits and antennas The unique feature of coplanar waveguides, as opposed to more conventional waveguides, is their uniplanar construction, in which all of the conductors are aligned on the same side of the substrate. This feature simplifies manufacturing and allows faster and less expensive characterization using on-wafer techniques. Coplanar Waveguide Circuits, Components, and Systems is an engineer's complete resource, collecting all of the available data on the subject. Rainee Simons thoroughly discusses propagation parameters for conventional coplanar waveguides and includes valuable details such as the derivation of the fundamental equations, physical explanations, and numerical examples. Coverage also includes: Discontinuities and circuit elements Transitions to other transmission media Directional couplers, hybrids, and magic T Microelectromechanical systems based switches and phase shifters Tunable devices using ferroelectric materials Photonic bandgap structures Printed circuit antennas
Author : Ho-Jin Song
Publisher : CRC Press
ISBN 13 : 9814613096
Total Pages : 606 pages
Book Rating : 4.8/5 (146 download)
Download or read book Handbook of Terahertz Technologies written by Ho-Jin Song and published by CRC Press. This book was released on 2015-04-15 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Terahertz waves, which lie in the frequency range of 0.1-10 THz, have long been investigated in a few limited fields, such as astronomy, because of a lack of devices for their generation and detection. Several technical breakthroughs made over the last couple of decades now allow us to radiate and detect terahertz waves more easily, which has trigg
Author : R.E. Miles
Publisher : Springer Science & Business Media
ISBN 13 : 1402065035
Total Pages : 365 pages
Book Rating : 4.4/5 (2 download)
Download or read book Terahertz Frequency Detection and Identification of Materials and Objects written by R.E. Miles and published by Springer Science & Business Media. This book was released on 2007-09-08 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Want an overview of where the technology of terahertz detection has been going? Here it is. The technology has largely been developed around expensive and bulky femtosecond laser systems but, as described in this book, advances in semiconductor superlattice technology are leading to compact "electronic" sources such as the quantum cascade laser, two-terminal "Gunn" type oscillators and even a THz frequency amplifier. These advances towards electronic (as opposed to optical) THz systems mean that the technology will become portable and much less costly.
Author : Kok Yeow You
Publisher : BoD – Books on Demand
ISBN 13 : 1789234921
Total Pages : 386 pages
Book Rating : 4.7/5 (892 download)
Download or read book Emerging Waveguide Technology written by Kok Yeow You and published by BoD – Books on Demand. This book was released on 2018-08-01 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, the rapid development of radiofrequency (RF)/microwave and photonic/optical waveguide technologies has had a significant impact on the current electronic industrial, medical and information and communication technology (ICT) fields. This book is a self-contained collection of valuable scholarly papers related to waveguide design, modeling, and applications. This book contains 20 chapters that cover three main subtopics of waveguide technologies, namely RF and microwave waveguide, photonic and optical waveguide and waveguide analytical solutions. Hence, this book is particularly useful to the academics, scientists, practicing researchers and postgraduate students whose work relates to the latest waveguide technologies.
Author : Joel P. Dunsmore
Publisher : John Wiley & Sons
ISBN 13 : 1119477131
Total Pages : 852 pages
Book Rating : 4.1/5 (194 download)
Download or read book Handbook of Microwave Component Measurements written by Joel P. Dunsmore and published by John Wiley & Sons. This book was released on 2020-06-29 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Microwave Component Measurements Second Edition is a fully updated, complete reference to this topic, focusing on the modern measurement tools, such as a Vector Network Analyzer (VNA), gathering in one place all the concepts, formulas, and best practices of measurement science. It includes basic concepts in each chapter as well as appendices which provide all the detail needed to understand the science behind microwave measurements. The book offers an insight into the best practices for ascertaining the true nature of the device-under-test (DUT), optimizing the time to setup and measure, and to the greatest extent possible, remove the effects of the measuring equipment from that result. Furthermore, the author writes with a simplicity that is easily accessible to the student or new engineer, yet is thorough enough to provide details of measurement science for even the most advanced applications and researchers. This welcome new edition brings forward the most modern techniques used in industry today, and recognizes that more new techniques have developed since the first edition published in 2012. Whilst still focusing on the VNA, these techniques are also compatible with other vendor's advanced equipment, providing a comprehensive industry reference.
Author : Artem Boriskin
Publisher : Springer
ISBN 13 : 3319627732
Total Pages : 494 pages
Book Rating : 4.3/5 (196 download)
Download or read book Aperture Antennas for Millimeter and Sub-Millimeter Wave Applications written by Artem Boriskin and published by Springer. This book was released on 2017-09-05 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the technology of millimetre waves and Terahertz (THz) antennas. It highlights the importance of moderate and high-gain aperture antennas as key devices for establishing point-to-point and point-to-multipoint radio links for far-field and near-field applications, such as high data-rate communications, intelligent transport, security imaging, exploration and surveillance systems. The book provides a comprehensive overview of the key antenna technologies developed for the mm wave and THz domains, including established ones – such as integrated lens antennas, advanced 2D and 3D horn antennas, transmit and reflect arrays, and Fabry-Perot antennas – as well as emerging metasurface antennas for near-field and far-field applications. It describes the pros and cons of each antenna technology in comparison with other available solutions, a discussion supplemented by practical examples illustrating the step-by-step implementation procedures for each antenna type. The measurement techniques available at these frequency ranges are also presented to close the loop of the antenna development cycle. In closing, the book outlines future trends in various antenna technologies, paving the way for further developments. Presenting content originating from the five-year ESF research networking program ‘Newfocus’ and co-authored by the most active and highly cited research groups in the domain of mm- and sub-mm-wave antenna technologies, the book offers a valuable guide for researchers and engineers in both industry and academia.
Author : Terry C. Edwards
Publisher : John Wiley & Sons
ISBN 13 : 1118936175
Total Pages : 688 pages
Book Rating : 4.1/5 (189 download)
Download or read book Foundations for Microstrip Circuit Design written by Terry C. Edwards and published by John Wiley & Sons. This book was released on 2016-02-01 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the success of the previous three editions, Foundations for Microstrip Circuit Design offers extensive new, updated and revised material based upon the latest research. Strongly design-oriented, this fourth edition provides the reader with a fundamental understanding of this fast expanding field making it a definitive source for professional engineers and researchers and an indispensable reference for senior students in electronic engineering. Topics new to this edition: microwave substrates, multilayer transmission line structures, modern EM tools and techniques, microstrip and planar transmision line design, transmission line theory, substrates for planar transmission lines, Vias, wirebonds, 3D integrated interposer structures, computer-aided design, microstrip and power-dependent effects, circuit models, microwave network analysis, microstrip passive elements, and slotline design fundamentals.
Author : Robert Miles
Publisher : Springer Science & Business Media
ISBN 13 : 9780792370970
Total Pages : 372 pages
Book Rating : 4.3/5 (79 download)
Download or read book Terahertz Sources and Systems written by Robert Miles and published by Springer Science & Business Media. This book was released on 2001-07-31 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop, Château de Bonas, France, 22-27 June 2000
Author : Irina T. Sorokina
Publisher : Springer Science & Business Media
ISBN 13 : 3540006214
Total Pages : 600 pages
Book Rating : 4.5/5 (4 download)
Download or read book Solid-State Mid-Infrared Laser Sources written by Irina T. Sorokina and published by Springer Science & Business Media. This book was released on 2003-07-10 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes the most advanced techniques for generating coherent light in the mid-infrared region of the spectrum. These techniques represent diverse areas of photonics and include heterojunction semiconductor lasers, quantum cascade lasers, tunable crystalline lasers, fiber lasers, Raman lasers, and optical parametric laser sources. Offering authoritative reviews by internationally recognized experts, the book provides a wealth of information on the essential principles and methods of the generation of coherent mid-infrared light and on some of its applications. The instructive nature of the book makes it an excellent text for physicists and practicing engineers who want to use mid-infrared laser sources in spectroscopy, medicine, remote sensing and other fields, and for researchers in various disciplines requiring a broad introduction to the subject.
