THz Wave Air Photonics and Its Appplications PDF Download
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Author: Xu Xie
Publisher: ProQuest
ISBN: 9780549287865
Category : Physics
Languages : en
Pages : 130
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Book Description
Author: Xu Xie
Publisher: ProQuest
ISBN: 9780549287865
Category : Physics
Languages : en
Pages : 130
Get Book Here
Book Description
Author: Xi-Cheng Zhang
Publisher: Springer Science & Business Media
ISBN: 1441909788
Category : Technology & Engineering
Languages : en
Pages : 250
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Book Description
Terahertz (THz) radiation, which is electromagnetic radiation in a frequency int- val from 0.3 to 10 THz (1 mm–30 ?m wavelength), is the next frontier in science and technology. This band occupies a large portion of the electromagnetic sp- trum between the infrared and microwave bands. Basic research, new initiatives, and developments in advanced sensing and imaging technology with regard to the THz band remain unexplored compared to the relatively well-developed science and technology in the microwave and optical frequencies. Historically, THz technologies were used mainly within the astronomy c- munity for studying the background of cosmic far-infrared radiation, and by the laser-fusion community for the diagnostics of plasmas. Since the ?rst demonstration of THz wave time-domain spectroscopy in the late 1980s, there has been a series of signi?cant advances (particularly in recent years) as more intense THz sources and higher sensitivity detectors provide new opportunities for understanding the basic science in the THz frequency range.
Author: Yun-Shik Lee
Publisher: Springer Science & Business Media
ISBN: 0387095403
Category : Technology & Engineering
Languages : en
Pages : 348
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Book Description
Principles of Terahertz Science and Technology aims to elucidate the fundamentals of THz technology and science for potential new users. It surveys major techniques of generating, detecting, and manipulating THz waves and also discusses a number of essential processes where THz waves interact with physical, chemical, and biological systems. This book serves as an introduction to THz technology for new researchers in various fields. Many different disciplines, such as ultrafast spectroscopy, semiconductor device fabrication, bio-medical imaging and more, involve the recent development of THz technology. It is necessary to lay down a strong, common foundation among researchers, so that communication can proceed smoothly. Previous THz research activities have concentrated on generation and detection, but the focus has now shifted to practical applications of this technology, such as high-speed optoelectronic signal processing and molecular spectroscopy. Drawing upon years of practical experience and using numerous examples and illustrative applications Yun-Shik Lee discusses: The major techniques of generating, detecting, and manipulating THz waves Essential processes where THz waves interact with physical, chemical, and biological systems Medical Applications of T-Ray Imaging including, optical properties of human tissue, cancer diagnostics, reflective imaging of skin burns and detection of dental caries Principles of Terahertz Science and Technology is an ideal book for applied physicists, microwave engineers, biomedical engineers, electrical engineers, and analytical chemists interested in the fundamentals and applications of THz engineering.
Author: Dimitris Pavlidis
Publisher: John Wiley & Sons
ISBN: 1119460719
Category : Technology & Engineering
Languages : en
Pages : 580
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Book Description
An authoritative and comprehensive guide to the devices and applications of Terahertz technology Terahertz (THz) technology relates to applications that span in frequency from a few hundred GHz to more than 1000 GHz. Fundamentals of Terahertz Devices and Applications offers a comprehensive review of the devices and applications of Terahertz technology. With contributions from a range of experts on the topic, this book contains in a single volume an inclusive review of THz devices for signal generation, detection and treatment. Fundamentals of Terahertz Devices and Applications offers an exploration and addresses key categories and aspects of Terahertz Technology such as: sources, detectors, transmission, electronic considerations and applications, optical (photonic) considerations and applications. Worked examplesbased on the contributors extensive experience highlight the chapter material presented. The text is designed for use by novices and professionals who want a better understanding of device operation and use, and is suitable for instructional purposes This important book: Offers the most relevant up-to-date research information and insight into the future developments in the technology Addresses a wide-range of categories and aspects of Terahertz technology Includes material to support courses on Terahertz Technology and more Contains illustrative worked examples Written for researchers, students, and professional engineers, Fundamentals of Terahertz Devices and Applications offers an in-depth exploration of the topic that is designed for both novices and professionals and can be adopted for instructional purposes.
Author: Kang Liu
Publisher:
ISBN:
Category :
Languages : en
Pages : 119
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Book Description
"With the increasing demands for remote spectroscopy in homeland security and environmental monitoring, terahertz (THz) spectroscopy has drawn a significant amount of attention because of its capability to acquire chemical spectral signatures non-invasively. However, the development of advanced THz remote sensing techniques is hindered by three factors: (1) strong absorption of THz wave by the water vapor in the ambient air, (2) difficulty to generate intense broadband coherent THz source remotely, and (3) difficulty to pass the THz waveform information remotely without losing the signal to noise ratio. In the past, we have investigated different THz air-photonics techniques to overcome the difficulties of THz remote sensing. Still, many problems remained unsolved, and the gap between proof-of-concept studies and state-of-the-art product has yet to be fulfilled. In this thesis, the work focuses on exploring how to improve THz generation and detection method for the purpose of remote sensing through tailoring the generation and detection media, air-plasma. For the THz generation part, auto-focusing ring-Airy beam was used to enhance the THz wave generation yield from two-color laser induced air plasma. For the THz detection part, the author first demonstrated THz remote sensing at 30 meters using THz Radiation- Enhanced-Emission-of-Fluorescence (REEF) technique, greatly improved from the 10 meters demonstration last reported, and then explored the THz-REEF technique in the counter-propagation geometry, which is more practical for stand-off detections than co-propagation geometry. Plasma-based THz emitters excel in many aspects thanks to their broad radiation bandwidth, high output pulse energy and immunity to high power damage. Various excitation wavelengths and gases were explored to seek for a stronger THz wave emission from laser-induced plasmas, whereas few attempts were made for this purpose with artificially modulated exotic wavepackets that have fascinating properties. In this thesis, it is demonstrated that abruptly auto-focusing beam induced air-plasma can give a 5.3-time-enhanced THz wave pulse energy compared to normal Gaussian beam induced plasma under the same conditions. At the same time, a red shift on the THz emission spectrum is also observed. We are able to perform a simulation using the interference model to qualitatively describe these behaviors. Remote sensing is one of the major challenges for THz radiation applications, due to the THz wave attenuation by the atmosphere water vapor during its propagation. THz-REEF is a THz air-photonics technique that has the potential to bypass this issue, by having the sought-after THz spectral fingerprints carried from the target to the operator by ultraviolet light, which experiences low absorption in the atmosphere. This technique has been previously demonstrated when the THz radiation and the laser excitation are focused collinearly, namely the co-propagating geometry. However, the co-propagating geometry is not a favorable configuration for practical stand-off detection. Therefore, further exploration on alternative sensing geometries is still required. Herein we report the interaction of broadband THz radiation with plasmas induced by a counter-propagating laser beam, which is a more desirable geometry for remote sensing. We have found that in the counter-propagating geometry the maximum amplitude of the REEF signal is comparable to that in the co-propagating case, whereas the time resolved REEF trace significantly changes. By performing the study with different plasmas, we observed that in the counter-propagating geometry the shape of the REEF trace depends strongly on the plasma length and electron density. A new theoretical model suggesting that the densest volume of the plasma does not contribute to the fluorescence enhancement is proposed to reproduce the experimental measurements. Our results further the understanding of the THz-plasma interaction and highlight the potential of THz-REEF technique in the plasma diagnostic applications."--Pages xii-xiv.
Author: Shimon Y. Nof
Publisher: CRC Press
ISBN: 1466569506
Category : Technology & Engineering
Languages : en
Pages : 432
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Book Description
New, significant scientific discoveries in laser and photonic technologies, systems perspectives, and integrated design approaches can improve even further the impact in critical areas of challenge. Yet this knowledge is dispersed across several disciplines and research arenas. Laser and Photonic Systems: Design and Integration brings together a multidisciplinary group of experts to increase understanding of the ways in which systems perspectives may influence laser and photonic innovations and application integration. By bringing together chapters from leading scientists and technologists, industrial and systems engineers, and managers, the book stimulates new thinking that would bring a systems, network, and system-of-systems perspective to bear on laser and photonic systems applications. The chapters challenge you to explore opportunities for revolutionary and broader advancements. The authors emphasize the identification of emerging research and application frontiers where there are promising contributions to lasers, optics, and photonics applications in fields such as manufacturing, healthcare, security, and communications. The book contains insights from leading researchers, inventors, implementers, and innovators. It explains a variety of techniques, models, and technologies proven to work with laser and photonic systems, their development, design, and integration. Such systems are of growing interest to many organizations, given their promise and potential solutions of grand societal challenges. Lastly, the book helps you leverage the knowledge into exciting new frontiers of successful solutions.
Author: Ali Rostami
Publisher: Springer Science & Business Media
ISBN: 3642157939
Category : Technology & Engineering
Languages : en
Pages : 256
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Book Description
The book presents information about Terahertz science, Terahertz photodetectors and Terahertz Lasers. A special emphasis is given to room temperature operation of long wavelength photodetectors based on novel quantum dots (Centered Defect Spherical Quantum Dots). Moreover, a complete analysis of systems based on Quantum Cascade structures to detect far infrared wavelengths is provided. Finally, the book presents Terahertz laser principles considering multi-color lasers in this range of wavelengths. Written as a background for graduate students in the Optics field.
Author: Qi Jin
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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Book Description
"Developing efficient and robust terahertz (THz) sources is of incessant interest in the THz community for their wide applications. For instance, THz waves are widely applied to nondestructive evaluation and biomedical imaging. Intense THz fields can be used for nonlinear interactions and electron acceleration. With successive efforts in past decades, numerous groups have achieved THz wave generation from solids, gases, and plasmas. However, liquid, especially liquid water has never been demonstrated as a THz source. One main reason leading the impediment is that water has strong absorption characteristics in the THz frequency regime. In this dissertation, a thin water film under intense laser excitation was introduced as the THz source to mitigate the considerable loss of THz waves from the absorption. Laserinduced plasma formation associated with a ponderomotive force-induced dipole model was proposed to explain the generation process. Compared with gas targets, water has a lower photon-ionization energy, but three orders of magnitude higher molecular density. Compared with solid targets, water does not suffer from permanent damage caused by the intense laser pulses. For the one-color excitation scheme, the water film generates a higher THz electric field than the air does under the identical experimental condition. Unlike the case of air, THz wave generation from liquid water prefers a subpicosecond (200-800 fs) laser pulse rather than a femtosecond pulse (~50 fs). This observation results from the plasma generation process in water. For the two-color excitation scheme, the THz electric field is enhanced by one-order of magnitude in comparison with the one-color case. Meanwhile, coherent control of the THz field is achieved by adjusting the relative phase between the fundamental pulse and the second-harmonic pulse. To eliminate the total internal reflection of THz waves at the water-air interface of a water film, a water line produced by a syringe needle was used to emit THz waves. As expected, more THz radiation can be coupled out and detected. As a supplement to the research of Terahertz Aqueous Photonics, THz wave generation from other liquids were also tested. For example, the THz electric field obtained from ?-Pinene is 1.8-times stronger than that from water under the same experimental condition, which mainly arises from the much weaker absorption of ?-Pinene for THz waves. Historically liquid water has been sworn off as a THz source. This dissertation not only demonstrates that water can be used to generate THz waves but also contributes to enthralling insight into the development of intense THz sources. The work also indicates that THz waves can be a great tool for the investigation of laser-liquid interaction"--Pages xii-xiii.
Author: Sudipta Das
Publisher: Springer Nature
ISBN: 981194105X
Category : Science
Languages : en
Pages : 304
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Book Description
This book is aimed to bring the emerging application aspects of THz technology and various modules used for its successful realization. It gathers scientific technological novelties and advancements already developed or under development in the academic and research communities. This book focuses on recent advances, different research issues in terahertz technology and would also seek out theoretical, methodological, well-established and validated empirical work dealing with these different topics. In particular, this textbook covers design considerations and current trends of THz antennas and antenna arrays to deal with the transmission and reception of THz EM waves. It also presents a discussion on metamaterial structures, meta-surfaces, and absorbers to be used for some kind of sensing and detection applications. Furthermore, it reports on THz wireless communication aspects, 6G network issues and challenges, advantages and disadvantages, generation and detection of THz waves, Signal and Communication Processing for THz communication, reconfigurable low-noise amplifier (LNA) design, III-Nitride HEMTs for THz Applications, photonic crystal fiber for sensing applications, THz Design Variable Estimation by Deep Optimization, and THz Imaging issues. Once the readers finish studying this book then they will learn about the importance of THz technology, advancement in the field, applications, THz modules like antennas, MIMO and DRAs, communication aspects, LNAs, generation of THz waves, etc and future scope. It also leads to enhancement in their knowledge in THz technology, gives a platform to future technology and novel applications realization.
Author: Mauro Pereira
Publisher: Springer Science & Business Media
ISBN: 9400707681
Category : Science
Languages : en
Pages : 218
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Book Description
Terahertz (THz) and Mid-Infrared (MIR) radiation (TERA-MIR) can be transmitted through nearly any material without causing biological harm. Novel and rapid methods of detection can be created with devices operation in these spectral ranges allowing scanning for weapons, detecting hidden explosives (including plastic landmines), controlling the quality of food and a host of other exciting applications. This book focuses on mathematical and physical aspects of the field, on unifying these two spectral domains (THz and MIR) with regard to common sources, detectors, materials and applications, and on key interdisciplinary topics. The main THz and MIR source is the quantum cascade laser (QCL). Thus significant attention is paid to the challenge of turning this advanced technology into affordable commercial devices so as to exploit its enormous potential. However other alternatives to THz QCLs are also presented, e.g. sub-terahertz imaging from avalanching GaAs bipolar transistors, Josephson junctions as THz sources, semiconductor materials for pulsed THz sources, superconducting THz electronics with Josephson vortices. In summary this book delivers a global picture of the state of the art in TERA-MIR generation, detection and applications.
