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Author : Hagen Wald
Publisher :
ISBN 13 : 9783932633850
Total Pages : 100 pages
Book Rating : 4.6/5 (338 download)
Download or read book Ultrafast Carrier Dynamics Investigated by a Novel Pump and Probe Terahertz Technique written by Hagen Wald and published by . This book was released on 2004 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jacob Tunesi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (128 download)
Download or read book Ultrafast Terahertz Characterisation of Surface Free Carrier Dynamics written by Jacob Tunesi and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph P. Avenoso
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.3/5 (514 download)
Download or read book Excited State Dynamics in Solid State Systems Investigated by Ultrafast Spectroscopies in the Visible and Terahertz Regimes written by Joseph P. Avenoso and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrafast spectroscopies on the femtosecond timescale are well suited to study electronic dynamics and coupling between quasiparticles in condensed matter systems. These interactions are of great fundamental importance and have widespread applications in engineering. Future developments in spintronics, valleytronics, and optoelectronics depend on an understanding of the couplings of electrons, phonons, magnons, and plasmons. Quasiparticle interactions take place on ultrafast timescales and can be investigated at visible and far infrared wavelengths. This work describes the development and application of time- and frequency-resolved spectroscopies to several important systems, with the purpose of directly detecting the specific quasiparticles involved in the dynamics and determining the timescales of their interactions. First, transient absorption spectroscopy and pump-degenerate four-wave mixing are utilized together to observe the electron-phonon and phonon-phonon scattering in transition metal dichalcogenides. These two spectroscopies jointly identify the specific phonons involved in these interactions. The application of pump-dlegenerate four-wave mixing to a solid state material is novel and requires an in-depth discussion of the interpretation of the measurement. Second, a time-resolved and time-domain terahertz spectroscopy instrument is developed. The characterization of the system is provided and two individual studies show its capabilities. Magnon excitations in single crystal NiO are first measured with terahertz absorption spectroscopy. The determination of these magnon frequencies demonstrates the high frequency resolution of the instrument. Following the magnon study, the charge carrier lifetimes in GaAs and ErAs:GaAs heterostructures are measured with optical pump-terahertz probe spectroscopy. The instrumentation and models of the ultrafast dynamics provide a framework for studying quasiparticle interactions in solid state systems with these techniques.
Author : Wim De Jong
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (141 download)
Download or read book Nonlinear Optical Study of Ultrafast Carrier Dynamics in GaAs written by Wim De Jong and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : SHANTANU GUPTA
Publisher :
ISBN 13 :
Total Pages : 520 pages
Book Rating : 4.3/5 (91 download)
Download or read book CARRIER DYNAMICS IN III-V MATERIALS AND HETERO-STRUCTURES STUDIED BY ULTRAFAST LASER TECHNIQUES (SEMICONDUCTORS, OPTOELECTRONICS, GROUP III V MATERIALS). written by SHANTANU GUPTA and published by . This book was released on 1992 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: transport across an MQW region.
Author : Michael S Shur
Publisher : World Scientific
ISBN 13 : 9814483990
Total Pages : 420 pages
Book Rating : 4.8/5 (144 download)
Download or read book Terahertz Sensing Technology - Vol 2: Emerging Scientific Applications And Novel Device Concepts written by Michael S Shur and published by World Scientific. This book was released on 2004-02-06 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last research frontier in high frequency electronics lies in the so-called terahertz (or submillimeter wave) regime, between the traditional microwave and the infrared domains. Significant scientific and technical challenges within the terahertz (THz) frequency regime have recently motivated an array of new research activities. During the last few years, major research programs have emerged that are focused on advancing the state of the art in THz frequency electronic technology and on investigating novel applications of THz frequency sensing. This book provides a detailed review of the new THz frequency technological developments that are emerging across a wide spectrum of sensing and technology areas.Volume II presents cutting edge results in two primary areas: (1) research that is attempting to establish THz-frequency sensing as a new characterization tool for chemical, biological and semiconductor materials, and (2) theoretical and experimental efforts to define new device concepts within the “THz gap”.
Author : Dwight L. Woolard
Publisher : World Scientific
ISBN 13 : 9812386114
Total Pages : 420 pages
Book Rating : 4.8/5 (123 download)
Download or read book Terahertz Sensing Technology: Emerging scientific applications & novel device concepts written by Dwight L. Woolard and published by World Scientific. This book was released on 2003 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last research frontier in high frequency electronics lies in the so-called terahertz (or submillimeter wave) regime, between the traditional microwave and the infrared domains. Significant scientific and technical challenges within the terahertz (THz) frequency regime have recently motivated an array of new research activities. During the last few years, major research programs have emerged that are focused on advancing the state of the art in THz frequency electronic technology and on investigating novel applications of THz frequency sensing. This book provides a detailed review of the new THz frequency technological developments that are emerging across a wide spectrum of sensing and technology areas.Volume II presents cutting edge results in two primary areas: (1) research that is attempting to establish THz-frequency sensing as a new characterization tool for chemical, biological and semiconductor materials, and (2) theoretical and experimental efforts to define new device concepts within the ?THz gap?.
Author : Paul A George
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (46 download)
Download or read book Terahertz Time-domain Spectroscopy written by Paul A George and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the Terahertz spectroscopy of several systems ranging from proteins to nanostructures. First, Terahertz Time-Domain Spectroscopy is introduced as a unique and powerful technique for studying physical processes that occur at Terahertz frequencies or on picosecond timescales. A detailed analysis of the design, construction, and performance of different types of Terahertz Time-Domain Spectrometers is presented. Next, discussion of the Terahertz frequency response of Bovine Serum Albumin protein and novel integrated photonic components measured using these spectrometers is discussed. In the penultimate and final chapters of this dissertation, the study of the ultrafast carrier dynamics in optically excited epitaxial graphene and germanium nanowires, respectively, using multi-color Optical-Pump Terahertz-Probe Spectroscopy is presented.
Author : Chen Xia
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (934 download)
Download or read book Terahertz Time-Domain Spectroscopy of Low-Dimensional Materials and Photonic Structures written by Chen Xia and published by . This book was released on 2013 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Terahertz (THz), the frequency region that bridges the gap between the radio and optical frequencies in the electromagnetic spectrum, is of both scientific and technological importance. Its broad applications, however, have been limited by the availability of bright sources and sensitive detectors. The invention of modelocked femtosecond lasers has made possible the generation and detection of electromagnetic transients on the picosecond to sub-picosecond time scale, which correspond to broadband coherent radiation up to a few or 10{u2019}s THz. This time-domain technique has had a significant impact on spectroscopy, imaging and sensing. While detectors and emitters have been the main interest in the development of THz technology, other components such as modulators, reflectors and filters are also of importance. In Chapter 2 we apply THz transmission spectroscopy to characterize polymeric materials and nano-composites. We demonstrate the design and fabrication of THz mirrors based on one-dimensional photonic crystals consisting thermoplastic polymers and BaTiO3 nanoparticles. Stop bands have been achieved in the THz region, and the results agree well with the prediction of the transfer matrix method. The main focus of this thesis is to study charge transport and carrier dynamics in low dimensional materials using THz time-domain spectroscopy. In contrast to conventional transport measurements, where electrical contacts are required, the THz method based on freely propagating electromagnetic transients can probe the electronic transport in a contactless fashion. In Chapter 3 we investigate highly oriented pyrolytic graphite (HOPG) using the THz emission spectroscopy. The direction, spectrum, polarization and dynamics of the emitted THz radiation from graphite upon ultrafast photoexcitation reveal the emission mechanism as well as the out-of-plane transport properties of graphite. In Chapter 4 metal phthalocyanines have been investigated by the optical pump/THz probe technique. Disc-like phthalocyanine molecules self-assemble into columns and form quasi-1D conduction channels for efficient charge transport. With appropriate side groups the material can have both crystalline and liquid crystalline phases. The photoconductivity spectrum, its dependence on the pump-probe delay time and sample temperature suggest the mechanism of as well as the influence of crystallinity on the photoconductivity in metal phthalocyanines.
Author : Jie Zhang
Publisher :
ISBN 13 :
Total Pages : 109 pages
Book Rating : 4.:/5 (895 download)
Download or read book Time-resolved Characterization of Non-equilibrium Carrier Dynamics in Gallium Based III-V Materials and Devices written by Jie Zhang and published by . This book was released on 2012 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Ga-based III-V materials, such as, GaAs, GaN and AlGaN, have a wide-range of applications in the fields of high-speed, high-temperature, high-power and high-frequency electronic and optoelectronic devices, due to their unique physical properties. This thesis is devoted to the time-resolved characterization of ultrafast, nonequilibrium carrier and phonon dynamics in Ga-based III-V materials and their devices. I present my studies of coherent acoustic phonons (CAPs) and nonlinear optical (NLO) process in GaN and AlGaN single crystals, as well as the ultrafast characterization of epitaxially-grown GaAs meso-structured photodetectors (PDs) and self-switching diodes (SSDs) operating as novel THz emitters and photon sensors. Studies of CAPs and NLO properties in III-Nitrides were accomplished using a femtosecond time-resolved pump-probe spectroscopy. We have experimentally investigated the generation, propagation and detection mechanisms of CAPs and, with the two-side CAPs detection scheme, the intrinsic phonon lifetime was measured to be 80 ns in GaN single crystals at room temperature. The NLO properties of AlGaN single crystals were studied by means of a multi-photon absorption (MPA) technique. My research shows that AlGaN exhibits a large nonlinear correlation factor, with a strong, 310-fs-wide correlation peak. Furthermore, our analysis of the correlation peak amplitude on the pump wavelength allowed us to demonstrate that its spectral dependence agreed very well with the Sheik-Bahae and Hutchings theory for the two-photon absorption (TPA) process. The latter indicates that the TPA process in AlGaN sample in our experiment consisting of one pump and one second-harmonic generation (SHG) of probe photons. I further report optical characterization of a novel PD device based on epitaxially-grown, single crystal GaAs. Our freestanding PD features an extremely low dark current of only 2×10−9 A and responsivity of 4.4 mA/W at 30 V. Its photon detection efficiency is ~ 7%. The time-domain electro-optical sampling (EOS) measurement results show that the PD has an ultrafast ~ 310 fs photoresponse, corresponding to a bandwidth of 1.4 THz. With a double-pulse optical excitation, the PD was tested for successful operation under ~ 1 THz clock rate. All the above properties make it a device-of-choice for future high-speed, high repetition rate, low power consumption optoelectronic application. GaAs-based SSDs have already shown their unique performance in microwave harvest and are predicted to be high-efficient THz emitters. We present here, for the first time, the time-resolved transient THz radiation signal generated by a photo-excited and biased SSD. The signal exhibits ~730 fs full-width-at-half-maximum (FWHM), corresponding to a 0.5 THz bandwidth burst"--Pages ix-x.
Author : Lianhe Li
Publisher : Frontiers Media SA
ISBN 13 : 2889760200
Total Pages : 120 pages
Book Rating : 4.8/5 (897 download)
Download or read book Advances in Terahertz Detection and Imaging written by Lianhe Li and published by Frontiers Media SA. This book was released on 2022-04-28 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Paul Corkum
Publisher : Springer Science & Business Media
ISBN 13 : 3540959467
Total Pages : 1031 pages
Book Rating : 4.5/5 (49 download)
Download or read book Ultrafast Phenomena XVI written by Paul Corkum and published by Springer Science & Business Media. This book was released on 2010-03-23 with total page 1031 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrafast Phenomena XVI presents the latest advances in ultrafast science, including both ultrafast optical technology and the study of ultrafast phenomena. It covers picosecond, femtosecond and attosecond processes relevant to applications in physics, chemistry, biology, and engineering. Ultrafast technology has a profound impact in a wide range of applications, amongst them biomedical imaging, chemical dynamics, frequency standards, material processing, and ultrahigh speed communications. This book summarizes the results presented at the 16th International Conference on Ultrafast Phenomena and provides an up-to-date view of this important and rapidly advancing field.
Author : Vladimir Mitin
Publisher : CRC Press
ISBN 13 : 100058688X
Total Pages : 917 pages
Book Rating : 4.0/5 (5 download)
Download or read book Graphene-Based Terahertz Electronics and Plasmonics written by Vladimir Mitin and published by CRC Press. This book was released on 2020-11-23 with total page 917 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene demonstrates interesting electrical, optical, and optoelectronic properties. A number of other one-atom-thick material structures have been discovered and studied. Industrially applicable technologies for these structures are currently under active development. In spite of enormous research in the area of devices based on graphene, the number of extensive review publications on THz devices based on graphene is small. This review volume would fill the gap. Researchers and engineers working in the fields of electronics and plasmonics can use it to understand the influence of plasmonics on device performance. The book can be also be used as a required text for doctorate courses and as a supplementary material for postgraduate courses. The material presented in the book is reviewed in detail in Chapter 1. Chapter 2 discusses the electronic and plasmonic properties of graphene and heterostructures based on graphene for all devices. Chapters 3–7 focus on the concepts of detectors and emitters with a special emphasis on plasmonic enhancement of those devices as well as on population inversion and lasing.
Author : Rohit P. Prasankumar
Publisher : CRC Press
ISBN 13 : 9781439815373
Total Pages : 0 pages
Book Rating : 4.8/5 (153 download)
Download or read book Optical Techniques for Solid-State Materials Characterization written by Rohit P. Prasankumar and published by CRC Press. This book was released on 2011-07-05 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last century, numerous optical techniques have been developed to characterize materials, giving insight into their optical, electronic, magnetic, and structural properties and elucidating such diverse phenomena as high-temperature superconductivity and protein folding. Optical Techniques for Solid-State Materials Characterization provides detailed descriptions of basic and advanced optical techniques commonly used to study materials, from the simple to the complex. The book explains how to use these techniques to acquire, analyze, and interpret data for gaining insight into material properties. With chapters written by pioneering experts in various optical techniques, the text first provides background on light–matter interactions, semiconductors, and metals before discussing linear, time-integrated optical experiments for measuring basic material properties, such as Fourier transform infrared spectroscopy, photoluminescence, and Raman scattering. The next section begins with a description of ultrashort pulse generation and carrier dynamics in semiconductors and metals. The book then discusses time-resolved optical techniques, such as pump–probe spectroscopy, terahertz spectroscopy, and magneto-optical spectroscopy. The subsequent section describes spatially resolved optical spectroscopy, including conventional optical microscopy and micro-optical and near-field scanning techniques. The book concludes with an overview of more advanced, emerging optical techniques, such as ultrafast x-ray and electron diffraction, ultrafast photoemission spectroscopy, and time-resolved optical microscopy. As optical techniques are among the first applied when studying new systems with novel properties, the information presented in this comprehensive reference will only grow in importance. By supplying clear, detailed explanations of these techniques, the book enables researchers to readily implement them and acquire new insights into the materials they study. CRC Press Authors Speak Rohit P. Prasankumar speaks about his book. Watch the Video
Author : Sudipta Das
Publisher : Springer Nature
ISBN 13 : 981194105X
Total Pages : 304 pages
Book Rating : 4.8/5 (119 download)
Download or read book Terahertz Devices, Circuits and Systems written by Sudipta Das and published by Springer Nature. This book was released on 2022-09-26 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 :
Publisher :
ISBN 13 :
Total Pages : 582 pages
Book Rating : 4.:/5 (318 download)
Download or read book Japanese Journal of Applied Physics written by and published by . This book was released on 2002 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mauro F. Pereira
Publisher : Springer
ISBN 13 : 9401785724
Total Pages : 201 pages
Book Rating : 4.4/5 (17 download)
Download or read book Terahertz and Mid Infrared Radiation: Detection of Explosives and CBRN (Using Terahertz) written by Mauro F. Pereira and published by Springer. This book was released on 2014-03-10 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reader will find here a timely update on new THz sources and detection schemes as well as concrete applications to the detection of Explosives and CBRN. Included is a method to identify hidden RDX-based explosives (pure and plastic ones) in the frequency domain study by Fourier Transformation, which has been complemented by the demonstration of improvement of the quality of the images captured commercially available THz passive cameras. The presented examples show large potential for the detection of small hidden objects at long distances (6-10 m). Complementing the results in the short-wavelength range, laser spectroscopy with a mid-infrared, room temperature, continuous wave, DFB laser diode and high performance DFB QCL have been demonstrated to offer excellent enabling sensor technologies for environmental monitoring, medical diagnostics, industrial and security applications. From the new source point of view a number of systems have been presented - From superconductors to semiconductors, e.g. Detection of Terahertz Waves from Superconducting Bi2Sr2CaCu2O8+δ Intrinsic Josephson Junctions. The quest for a compact room temperature THz source and the recent advances in high power mid-IR QCLs lead to the development of a semiconductor THz source based on intracavity difference frequency generation. Furthermore, alternative electrically pumped THz sources based on the high emission efficiency predicted for polaritonic states in the ultra-strong coupling regime led to the demonstration of electroluminescent devices. Finally, antipolaritons in dispersive media were discussed and different aspects of the interaction of THz radiation with biomatter were presented.
