Relevant bibliographies by topics / Terahertz

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Terahertz'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 September 2024

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Journal articles on the topic "Terahertz"

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Guo, Yue, Shuqun Wu, Xuhui Liu, Lu Yang, and Chaohai Zhang. "The Application of Microplasma in the Terahertz Field: A Review." Applied Sciences 11, no. 24 (December 14, 2021): 11858. http://dx.doi.org/10.3390/app112411858.

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Terahertz functional devices are essential to the advanced applications of terahertz radiation in biology and medicine, nanomaterials, and wireless communications. Due to the small size and high plasma frequency of microplasma, the interaction between terahertz radiation and microplasma provides opportunities for developing functional terahertz devices based on microplasma. This paper reviews the applications of microplasma in terahertz sources, terahertz amplifiers, terahertz filters, and terahertz detectors. The prospects and challenges of the interdisciplinary research between microplasma and terahertz technology are discussed.
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Yao, Shutong, and Junyi Teng. "Terahertz communication for 6G networks: Opportunities and challenges." Applied and Computational Engineering 46, no. 1 (March 15, 2024): 232–41. http://dx.doi.org/10.54254/2755-2721/46/20241431.

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This paper introduces terahertz communication technology, the core component of future 6 g wireless communication. Terahertz band communication can expand the spectrum range of communication, increase its capacity limit, and can be effectively utilized and realized in many fields. This paper systematically describes the background, development, difficulties and challenges of terahertz communication, as well as the possible application fields and development prospects in the future, and introduces in detail the key technologies of terahertz communication, including the simulation processing of terahertz signal processing and modulation technology and the research data of the system. In this paper, I use the ten-ray model modeling to help me understand the propagation characteristics of terahertz waves in different environments, and provide reference and guidance for the application of terahertz waves and system design. Finally, the future application field of terahertz are expanded and prospected. It describes new and predictable technologies that combine the power of terahertz technology with other technologies, such as exploring hybrid terahertz/optical wireless links, terahertz automotive applications, terahertz communications to enhance data center performance and terahertz 3D beamforming technology.
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Wang, Chen, Jianyuan Qin, Wendao Xu, Min Chen, Lijuan Xie, and Yibin Ying. "Terahertz Imaging Applications in Agriculture and Food Engineering: A Review." Transactions of the ASABE 61, no. 2 (2018): 411–24. http://dx.doi.org/10.13031/trans.12201.

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Abstract. Terahertz technology, including terahertz spectroscopy and terahertz imaging, is gaining increasing attention and plays an important role in various fields. With the development of terahertz sources and detectors in recent decades, terahertz imaging has been applied in many fields, including security screening, material evaluation, biomedicine, agriculture, and food science. However, progress has been comparatively slow in applying terahertz imaging to agriculture and food engineering. In this article, some commonly used terahertz imaging systems are summarized, and various applications of terahertz imaging in agriculture and food engineering are reviewed, including food safety and quality inspection, seed inspection, water content evaluation of plant leaves, and others. Challenges and the future outlook of terahertz imaging are also discussed. Keywords: Agriculture, Food, Instrumentation, Seed, Terahertz imaging.
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Okada, Kosuke, Quentin Cassar, Hironaru Murakami, Gaëtan MacGrogan, Jean-Paul Guillet, Patrick Mounaix, Masayoshi Tonouchi, and Kazunori Serita. "Label-Free Observation of Micrometric Inhomogeneity of Human Breast Cancer Cell Density Using Terahertz Near-Field Microscopy." Photonics 8, no. 5 (May 1, 2021): 151. http://dx.doi.org/10.3390/photonics8050151.

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Terahertz-light imaging is attracting great attention as a new approach in non-invasive/non-staining biopsy of cancerous tissues. Positively, terahertz light has been shown to be sensitive to the cell density, the hydration content, and the chemical composition of biological samples. However, the spatial resolution of terahertz imaging is typically limited to several millimeters, making it difficult to apply the technology to image biological tissues which have sub-terahertz-wavelength-scale inhomogeneity. For overcoming the resolution, we have recently developed a terahertz near-field microscope with a spatial resolution of 10 µm, named scanning point terahertz source (SPoTS) microscope. In contrast to conventional far-field terahertz techniques, this microscope features the near-field interactions between samples and point terahertz sources on a sub-terahertz-wavelength scale. Herein, to evaluate the usefulness of terahertz imaging in cancer tissue biopsy in greater detail, we performed terahertz near-field imaging of a paraffin-embedded human-breast-cancer section having sub-terahertz-wavelength-scale inhomogeneity of the cancer cell density using the SPoTS microscope. The observed terahertz images successfully visualized local (~250 µm) inhomogeneities of the cell density in breast invasive ductal carcinoma. These results may bypass the terahertz limitation in terms of spatial resolution and may further motivate the application of terahertz light to cancer tissue biopsy.
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Keiser, George, and Pernille Klarskov. "Terahertz Field Confinement in Nonlinear Metamaterials and Near-Field Imaging." Photonics 6, no. 1 (February 28, 2019): 22. http://dx.doi.org/10.3390/photonics6010022.

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This article reviews recent advances in terahertz science and technology that rely on confining the energy of incident terahertz radiation to small, very sub-wavelength sized regions. We focus on two broad areas of application for such field confinement: metamaterial-based nonlinear terahertz devices and terahertz near-field microscopy and spectroscopy techniques. In particular, we focus on field confinement in: terahertz nonlinear absorbers, metamaterial enhanced nonlinear terahertz spectroscopy, and in sub-wavelength terahertz imaging systems.
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Vertiy, Alexey A., Harun Cetinkaya, and Mustafa Tekbas. "Subsurface Sub-terahertz and Terahertz Tomography." PIERS Online 6, no. 5 (2010): 485–89. http://dx.doi.org/10.2529/piers091208093425.

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Du, Wanyi, Yuanyuan Huang, Yixuan Zhou, and Xinlong Xu. "Terahertz interface physics: from terahertz wave propagation to terahertz wave generation." Journal of Physics D: Applied Physics 55, no. 22 (February 4, 2022): 223002. http://dx.doi.org/10.1088/1361-6463/ac3f58.

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Abstract Terahertz (THz) interface physics as a new interdiscipline between the THz technique and condensed matter physics has undergone rapid development in recent years. In particular, the development of advanced materials, such as graphene, transitional metal dichalcogenides, topological insulators, ferromagnetic metals, and metamaterials, has revolutionized the interface field and further promoted the development of THz functional devices based on interface physics. Moreover, playing at the interface of these advanced materials could unveil a wealth of fascinating physical effects such as charge transfer, proximity effect, inverse spin-Hall effect, and Rashba effect with THz technology by engineering the charge, spin, orbit, valley, and lattice degrees of freedom. In this review, we start with a discussion of the basic theory of THz interface physics, including interface formation with advanced materials, THz wave reflection and transmission at the interface, and band alignment and charge dynamics at the interface. Then we move to recent progress in advanced materials from THz wave propagation to THz wave generation at the interface. In THz wave propagation, we focus on THz wave impedance-matching, Goos–Hänchen and Imbert–Fedorov shifts in THz region, interfacial modulation and interfacial sensing based on THz waves. In THz wave generation, we summarize ongoing coherent THz wave generation from van der Waals interfaces, multiferroic interfaces, and magnetic interfaces. The fascinating THz interface physics of advanced materials is promising and promotes novel THz functional devices for manipulating propagation and generation of THz waves at interfaces.
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Ma, Shaoqing, Peng Ding, Zhengxuan Zhou, Huilong Jin, Xiaoli Li, and Yingwei Li. "Terahertz Radiation Modulates Neuronal Morphology and Dynamics Properties." Brain Sciences 14, no. 3 (March 14, 2024): 279. http://dx.doi.org/10.3390/brainsci14030279.

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Terahertz radiation falls within the spectrum of hydrogen bonding, molecular rotation, and vibration, as well as van der Waals forces, indicating that many biological macromolecules exhibit a strong absorption and resonance in this frequency band. Research has shown that the terahertz radiation of specific frequencies and energies can mediate changes in cellular morphology and function by exciting nonlinear resonance effects in proteins. However, current studies have mainly focused on the cellular level and lack systematic studies on multiple levels. Moreover, the mechanism and law of interaction between terahertz radiation and neurons are still unclear. Therefore, this paper analyzes the mechanisms by which terahertz radiation modulates the nervous system, and it analyzes and discusses the methods by which terahertz radiation modulates neurons. In addition, this paper reviews the laws of terahertz radiation’s influence on neuronal morphology and kinetic properties and discusses them in detail in terms of terahertz radiation frequency, energy, and time. In the future, the safety of the terahertz radiation system should be considered first to construct the safety criterion of terahertz modulation, and the spatial resolution of the terahertz radiation system should be improved. In addition, the systematic improvement of the laws and mechanisms of terahertz modulation of the nervous system on multiple levels is the key to applying terahertz waves to neuroscience. This paper can provide a platform for researchers to understand the mechanism of the terahertz–nervous system interaction, its current status, and future research directions.
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Gao, Feilong, Mingzhe Jiang, and Shaodong Hou. "A Chirped Characteristic-Tunable Terahertz Source for Terahertz Sensing." Sensors 24, no. 16 (August 22, 2024): 5419. http://dx.doi.org/10.3390/s24165419.

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In broadband terahertz waves generated by femtosecond lasers, spatial chirp will be simultaneously produced with the introduction of angular dispersion. The chirp characteristics of the terahertz wave will directly affect the frequency response, bandwidth response, and intensity response of the terahertz sensor. To enhance the capability of terahertz sensors, it is necessary to control and improve the chirped characteristics of broadband terahertz sources. We generate a chirped terahertz wave via optical rectification in a LiNbO3 prism using the technique of pulse front tilt. The effect of the pump-beam spot size on THz generation is systematically studied. The pump’s spot size is manipulated using a telescope system. With a pump spot diameter of 1.8 mm, the scanning spectrum of the THz pulse is narrower and is divided into multiple distinct peaks. In contrast, using a pump spot diameter of 3.7 mm leads to increased efficiency in the generation of THz pulses. Also, we investigate the underlying properties governing the generation of chirped terahertz pulses using varying pump pulse spot diameters.
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Liu, Jianlong, Xin Li, Ruirui Jiang, Kaiqiang Yang, Jing Zhao, Sayed Ali Khan, Jiancheng He, Peizhong Liu, Jinfeng Zhu, and Baoqing Zeng. "Recent Progress in the Development of Graphene Detector for Terahertz Detection." Sensors 21, no. 15 (July 22, 2021): 4987. http://dx.doi.org/10.3390/s21154987.

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Terahertz waves are expected to be used in next-generation communications, detection, and other fields due to their unique characteristics. As a basic part of the terahertz application system, the terahertz detector plays a key role in terahertz technology. Due to the two-dimensional structure, graphene has unique characteristics features, such as exceptionally high electron mobility, zero band-gap, and frequency-independent spectral absorption, particularly in the terahertz region, making it a suitable material for terahertz detectors. In this review, the recent progress of graphene terahertz detectors related to photovoltaic effect (PV), photothermoelectric effect (PTE), bolometric effect, and plasma wave resonance are introduced and discussed.
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Dissertations / Theses on the topic "Terahertz"

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Mikhaylovskiy, Rostislav. "Terahertz magnonics." Thesis, University of Exeter, 2012. http://hdl.handle.net/10871/9803.

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The potential of terahertz time domain spectroscopy has until recently been neglected in the field of the ultrafast magnetism. At the same time this technique can serve as a useful complementary tool with respect with conventional methods to investigate ultrafast magnetization dynamics. This thesis aims to implement time domain terahertz spectroscopy to observe high frequency spin waves excited optically in different magnetic systems. This work covers several distinct phenomena related to the study of spin waves (magnonics) at terahertz frequencies. The generation of transient broadband nonlinear magnetization via inverse Faraday effect in terbium gallium garnet is described in chapter 4. We demonstrate a remarkable discrepancy of at least two orders of magnitude between the strengths of the direct and inverse Faraday effects, thereby challenging the commonly accepted understanding of their relationship. Additionally, a striking nonlocality of the optical response is found. In chapter 5 the results of THz absorption spectroscopy of the terbium gallium garnet are reported. The garnet exhibits an intricate paramagnetic state with several magnetic sub-lattices at cryogenic temperatures under the application of strong magnetic fields. Some precessional modes of these sub-lattices were measured. The components of the g-tensor of terbium ions were extracted from the data. In chapter 6 the ultrafast magnetization dynamics of thulium orthoferrite, studied my means of terahertz spectroscopy, is described. It is demonstrated that terahertz response of the orthoferrite provides crucial additional information with respect to the optical pump-probe signal. A novel exchange driven mechanism of optical manipulation of the magnetic state is demonstrated. Finally, chapter 7 is a theoretical discussion of so called planar magnonic metamaterials. It is shown that the arrays of ferromagnetic films may exhibit negative refraction index at sub-terahertz frequencies, provided the mechanism of spin wave quantization is introduced. The thesis ends with a brief conclusions chapter where a short summary of the results is given. Some possible future extensions of the conducted research are drawn as well.
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Karabiyik, Mustafa. "Terahertz Plasmonic Devices." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3185.

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Terahertz (THz) devices are designed to operate from 0.1-10 THz. The THz spectra have unique properties such as penetration through soft materials and reflecting from hard materials, which make THz technologies, a prime candidate for imaging. Plasmons are longitudinal charge oscillations in carrier rich materials. Plasmons can be generated over the channel of transistors inducing a voltage between the source-drain when conditions are satisfied. In this thesis, plasmonic devices operating in the THz region have been studied both theoretically and experimentally investigating GaN/AlGaN and Graphene based transistors. First, we report on a detailed study of dispersion properties of uniform grating gate THz plasmonic crystals, asymmetric dual grating gate plasmonic crystals and with symmetry-breaking defect-like cavities in order to understand the physics behind THz plasmons. For the first time, we defined the dispersion of plasmons in terms of effective plasmonic index. By adding an additional grating on top of the grating gate with a different periodicity, doubles the amount of absorption. Plasmons can be excited when polarization is perpendicular to the gate. We then showed focusing and exciting of THz plasmons polarization independent using circular grating lenses. Sub-micron THz ring resonators are presented showing THz guiding in plasmonic waveguides. So far, resonant sensing has been observed only at cryogenic temperatures since electron mobility is high enough at low temperatures to sustain resonant plasmonic excitation at the channel of the detector. Recently, graphene attracted the attention of the researchers because of its high mobility at room temperature. Room temperature detection has been attempted and achieved, however the detectors have very small responsivity with non-resonant behavior since the graphene is sandwiched and fabrication of such detectors in large scale is impossible with the methods used. Here, we present a resonant room temperature detection of THz with upside down free standing graphene FETs having more than a 400 quality factor, a record high number in the field which is up to 50 times higher than GaN detectors and hundreds of responsivity values with a maximum around 400 V/W which is record high for graphene (10,000 times higher than previously reported graphene detector).
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Peters, Luke A. S. "Surface terahertz phenomena." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/76771/.

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With the massive advantages of THz radiation and the current technical difficulties in mind, I have chosen to undertake research into terahertz surface phenomena, which is the focal point of my thesis. Ultrathin surface terahertz emitters have many advantages as they have an extremely thin active region, typically hundreds of atomic layers. In this framework, III-V semiconductors, such as InAs and InSb, have record-breaking conversion efficiencies per unit thickness. In addition, the phase mismatch, which commonly limits the generation of terahertz from optical crystal, is negligible and so there is an opportunity for enhancing the emitted bandwidth. My thesis is born as the core of many research interests of my research lab (Emergent Photonics), which enabled the appropriate availability of resources that made my results possible. It also created several spin-out research lines. All the work presented is my work (with the exception of the background research). Parts of chapters have been published in journals and publications which see me as the first author. The structure of this thesis is as follows. First I discuss optical pump rectification emission, and the saturation of InAs terahertz emissions. Then I introduce my work on terahertz enhancement emission through graphene. Finally, I present my work on an exotic terahertz emission mechanism, namely the all-optical surface optical rectification and I place my concluding remarks.
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Burghoff, David Patrick. "Broadband terahertz photonics." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92964.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 181-190).
In recent years, quantum cascade lasers have emerged as mature semiconductor sources of light in the terahertz range, the frequency range spanning 1 to 10 THz. Though technological development has pushed their operating temperatures up to 200 Kelvin and their power levels up to Watt-level, they have remained unsuitable for many applications as a result of their narrow spectral coverage. In particular, spectroscopic and tomographic applications require sources that are both powerful and broadband. Having said that, there is no fundamental reason why quantum cascade lasers should be restricted to narrowband outputs. In fact, they possess gain spectra that are intrinsically broad, and beyond that can even be tailored to cover an octave-spanning range. This thesis explores the development of broadband sources of terahertz radiation based on quantum cascade lasers (QCLs). The chief way this is done is through the development of compact frequency combs based on THz QCLs, which are able to continuously generate milliwatt levels of terahertz power covering a fractional bandwidth of 14% of their center frequency. These devices operate on principles similar to microresonator-based frequency combs, and make use of the quantum cascade laser's fundamentally large nonlinearity to phase-lock the cavity modes. These devices will enable the development of ultra-compact dual comb spectrometers based on QCLs, and will potentially even act as complete terahertz spectrometers on a chip. This thesis also uses broadband terahertz time-domain spectroscopy to analyze the behavior of THz QCLs. By using QCLs as photoconductive switches, the usual limitations imposed by optical coupling are circumvented, and properties of the laser previously inaccessible can be directly observed. These properties include the gain and absorption of the laser gain medium, the populations of the laser's subbands, and properties of the waveguide like its loss and dispersion. Knowledge of these properties were used to guide frequency comb design, and were also used to inform simulations for designing better lasers.
by David Patrick Burghoff.
Ph. D.
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Numan, Nagla Numan Ali. "Terahertz (THz) spectroscopy." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71690.

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Thesis (MSc)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: Terahertz radiation is currently used in security, information and communication technology (ICT), and biomedical sciences among others. The usability of terahertz (THz) radiation, in many of its applications depends on characteristics of the materials being investigated in the THz range. At the heart of THz usage is a THz spectroscopy system necessary for the generation and detection of the THz radiation. In this thesis, we characterise such a THz spectroscopy system. In our typical THz spectrometric system, we make use of femtosecond (fs) laser technology and pump-probe principles for emission and detection of THz radiation. Background about the principles of generation THz radiation using fs triggered antennas and the principles of the spectroscopy technique and appropriate literature references are presented. Using an assembled commercially available kit, we reproduce known spectra in order to confirm correct functionality (for calibration) of the assembled spectroscopy system and to gain experience in interpreting these spectra. By introducing a suitable x - y scanning device we construct a crude THz imaging device to illustrate the principle.
AFRIKAANSE OPSOMMING: Terahertsstraling word deesdae wyd in die sekuriteits, inligting-en-kommunikasie en biomediese sektore aangewend. Die gepastheid van terahertsstraling (THz) vir ’n spesifieke toepassings hang af van die eienskappe van die materiale wat ondersoek word. Vir die uitvoer van sulke eksperimente word ’n THz-spektroskopie sisteem benodig vir die opwekking en meting van THz-straling. In hierdie tesis word so ’n THz-spektroskopie sisteem beskou en gekarakteriseer. In die sisteem word van ’n femtosekondelaser (fs) gebruik gemaak in ’nn pomp-en-proef opstelling vir die uitstraling en meting van THz-straling. Die beginsels rakende die opwekking van THz-straling, deur gebruik te maak van ’n antenna wat deur ’n fs-laser geskakel word, asook die beginsels van die spektroskopiese tegniek, met toepaslike verwysings, word in die tesis aangebied. Deur gebruik te maak van’n kommersiële THz opstelling is bekende spektra gemeet om die korrekte funksionering (vir kalibrasie doeleindes) na te gaan en om ondervinding op te doen in die interpretasie van hierdie spektra. ’n X-Y-translasie toestel is tot die opstelling bygevoeg om THz-afbeelding moontlik te maak en sodoende hierdie beginsel te illustreer.
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Jin, Chuhang. "Microstructured Terahertz Fiber." Thesis, KTH, Tillämpad fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265667.

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Klatt, Gregor [Verfasser]. "Charakterisierung neuartiger Terahertz-Emitter mittels schneller, präziser Terahertz-Spektroskopie / Gregor Klatt." München : Verlag Dr. Hut, 2011. http://d-nb.info/1014848628/34.

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Kao, Tsung-Yu. "From high power terahertz quantum cascade lasers to terahertz light amplifiers." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87923.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 201-208).
The terahertz (THz) frequency range (300 GHz to 10 THz, wavelength 30-1000 [mu]m), despite having many potential applications, is technologically relatively underdeveloped mainly because of the lack of suitable coherent radiation sources when compared with nearby electromagnetic radiation spectrum. The invention of the THz quantum cascade laser, a electronically-pumped semiconductor heterostructure which emits photons from electronic intersubband transitions, provides the first solidstate fundamental oscillator at the frequency range from 1.2 to 5.1 THz. Due to the subwavelength confinement nature of the metal-metal waveguide used in most of the THz QC lasers, far-field beam patterns from lasers with simple Fabry-Perot waveguides are divergent and far from ideal Gaussian beams. The first part of this thesis describes the development of single-mode THz QC lasers on metal-metal waveguides. Starting with the corrugated third-order DFB laser-a clever laser structure which utilizes end-fire array effect to achieve low divergence beam patterns-several applications using densely-packed third-order DFB laser arrays, such as frequency agile sources for THz swept-source optical tomography and local oscillators for THz heterodyne receivers with precise frequency control, have been investigated. With the improved design rules and fabrication techniques, 830 GHz single-mode frequency coverage on a monolithic multicolor DFB laser array has been achieved. The origin of the deterioration in far-field beam patterns and power outputs in long third-order DFB lasers is then identified. This finding leads to a modified third-order DFB laser structure which can achieve perfect phase-matching (PM) condition, resulting in scalable power output and even lower beam divergence when compared with that of a conventional third-order DFB laser. Radiations from up to 151 laser sectors are phase-locked to form a single-lobe beam pattern with divergence ~ 6 x 11° and ~13 mW pulsed power at the end-fire direction. This approach substantially increases the usable length of a third-order DFB laser while keeping a high slope efficiency (140 mW/A). Later development applies the concept of microstrip antenna-a structure commonly used in microwave engineering-to THz photonics devices. By coupling the microstrip antenna to each grating aperture of a perfectly phase-matched DFB laser, the radiation impedance of the laser can now be tuned to enhance the overall emission efficiency. This novel genre of DFB laser achieves > 8 mW pulsed power (10% duty-cycle) at 12 K with beam divergence as low as 12.5 x 12.5' and maximum lasing temperature Tmax = 109 K (pulsed) and 77 K (c.w.) with the highest slope efficiency (~450 mW/A) and wall-plug efficiency (0.57%) of all THz DFB laser sources. The second part of the thesis then focuses on the development of the first light amplifier in THz frequency under Fabry-Perot amplifier (FPA) scheme. Although amplification at terahertz frequency in quantum cascade structures has been demonstrated under the transient state or in a integrated platform, none of them is suitable for amplifying continuous-wave free-space THz radiations. The proposed amplifier is consisted of an array of short-cavity surface-emitting second-order distributed feedback lasers arranged in a two-dimensional grid which are operated marginally beneath their lasing thresholds. A overall system power gain of ~5.6x = 7.5 dB at ~3 THz is obtained with ~1 GHz bandwidth. The free-space THz light amplifier can be used as the pre-amplifier for a THz heterodyne receiver system to reduce the receiver system noise, or be placed on the focal plane of a THz imaging system to enhance the signal-to-noise ratio of the image and reduce the acquisition time. A new locking mechanism for two-dimensional phase-locked laser arrays based on antenna mutual-coupling is also proposed and then successfully demonstrated in the THz frequency using short-cavity DFB THz lasers. Up to 37 lasers are phase-locked to deliver 6.5 mW single-mode pulsed power (4% duty-cycle) at 3 THz with symmetric beam pattern (< 10 x 10°). This new coupling scheme can be extended to other electromagnetic systems with sub-wavelength confined elements such as plasmonic lasers and nanolasers. This thesis also reports the development of fabrication techniques required to bring the aforementioned novel THz cavity designs from concepts to reality which include a high aspect ratio (> 1:10) anisotropic reactive-ion etch on GaAs which is compatible with the metal-metal waveguide platform and the procedure to create airbridge structures by selectively removing the dielectric materials beneath the metal contacts.
by TsungYu Kao.
Ph. D.
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Skjeie, Hans Christian Bakken. "Terahertz Time-Domain Spectroscopy." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19214.

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The field of terahertz time-domain spectroscopy (THz-TDS) is still far from reaching its full potential, but is a very promising utility for a wide range of applications. Principle experiments have been performed in fields of drug screening, pharmaceutical, medical diagnostics, security imaging and detection of explosives. Optimized and adapted THz-TDS systems holds great promise for driving this technology further.The purpose of this thesis was to build a THz-TDS system, explore possibilities for improving this system and to perform THz-TDS measurements on semiconductors and wood. The aim of the experimental work was to build a stable and reliable system with an electric field strength of THz radiation in the order of kV/cm. The THz-TDS system used in this thesis was based upon the principles of optical rectification and free-space electro-optic sampling in zinc telluride (ZnTe) crystals using a femtosecond Ti:Sapphire amplified laser.Theoretical studies were performed on the principles of generation and detection of THz radiation. The experimental work was based on publications of similar experiments. Theoretical and experimental studies lead to several modifications and improvements of the setup first built in this thesis. Experiments were performed on disparate materials to find suitable materials for THz transmission. Results from measurements performed on semiconductors and wood, obtained by THz-TDS, were analysed to find the absorption coefficient and the refractive index of the materials. The spectroscopic information obtained by THz-TDS can also be used to find the conductivity and the mobility of these materials. THz-TDS measures the electric field and therefore provides information of both the amplitude and the phase of the THz wave. A Fourier transformation was used to obtain the frequency spectrum of the detected signal. The improvements were done by analysing the results of the detected signal to see which adjustments and modifications to the setup that had positive effects on the results. The pump power used for generation of THz radiation and the optimum azimuthal angle of the ZnTe crystals were crucial to obtain a THz-TDS system with a strong electric field. The maximum electric field strength for the THz radiation in this thesis was 13.2 kV/cm, with a signal-to-noise ratio of 43 and dynamic range of 1500.
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Williams, Benjamin S. (Benjamin Stanford) 1974. "Terahertz quantum cascade lasers." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/17012.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
Includes bibliographical references (p. 297-310).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
The development of the terahertz frequency range has long been impeded by the relative dearth of compact, coherent radiation sources of reasonable power. This thesis details the development of quantum cascade lasers (QCLs) that operate in the terahertz with photon energies below the semiconductor Reststrahlen band. Photons are emitted via electronic intersubband transitions that take place entirely within the conduction band, where the wavelength is chosen by engineering the well and barrier widths in multiple-quantum-well heterostructures. Fabrication of such long wavelength lasers has traditionally been challenging, since it is difficult to obtain a population inversion between such closely spaced energy levels, and because traditional dielectric waveguides become extremely lossy due to free carrier absorption. This thesis reports the development of terahertz QCLs in which the lower radiative state is depopulated via resonant longitudinal-optical phonon scattering. This mechanism is efficient and temperature insensitive, and provides protection from thermal backfilling due to the large energy separation between the lower radiative state and the injector. Both properties are important in allowing higher temperature operation at longer wavelengths. Lasers using a surface plasmon based waveguide grown on a semi-insulating (SI) GaAs substrate were demonstrated at 3.4 THz in pulsed mode up to 87 K, with peak collected powers of 14 mW at 5 K, and 4 mW at 77 K.
Additionally, the first terahertz QCLs have been demonstrated that use metalmetal waveguides, where the mode is confined between metal layers placed immediately above and below the active region. These devices have confinement factors close to unity, and are expected to be advantageous over SI-surface-plasmon waveguides, especially at long wavelengths. Such a waveguide was used to obtain lasing at 3.8 THz in pulsed mode up to a record high temperature of 137 K, whereas similar devices fabricated in SI-surface-plasmon waveguides had lower maximum lasing temperatures due to the higher losses and lower confinement factors. This thesis describes the theory, design, fabrication, and testing of terahertz quantum cascade laser devices. A summary of theory relevant to design is presented, including intersubband radiative transitions and gain, intersubband scattering, and coherent resonant tunneling transport using a tight-binding density matrix model. Analysis of the effects of the complex heterostructure phonon spectra on terahertz QCL design are considered. Calculations of the properties of various terahertz waveguides are presented and compared with experimental results. Various fabrication methods have been developed, including a robust metallic wafer bonding technique used to fabricate metal-metal waveguides. A wide variety of quantum cascade structures, both lasing and non-lasing, have been experimentally characterized, which yield valuable information about the transport and optical properties of terahertz devices. Finally, prospects for higher temperature operation of terahertz QCLs are considered.
by Benjamin S. Williams.
Ph.D.
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Books on the topic "Terahertz"

1

Bründermann, Erik, Heinz-Wilhelm Hübers, and Maurice FitzGerald Kimmitt. Terahertz Techniques. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-02592-1.

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Rostami, Ali, Hassan Rasooli, and Hamed Baghban. Terahertz Technology. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-15793-6.

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Sakai, Kiyomi, ed. Terahertz Optoelectronics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/b80319.

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Phillips, Xander. Terahertz Technology. New Delhi: World Technologies, 2011.

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Kiyomi, Sakai, ed. Terahertz optoelectronics. Berlin: Springer, 2005.

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Heinz-Wilhelm, Hübers, Kimmitt Maurice FitzGerald, and SpringerLink (Online service), eds. Terahertz Techniques. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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Carpintero, Guillermo, Luis Enrique García Muñoz, Hans L. Hartnagel, Sascha Preu, and Antti V. Räisänen, eds. Semiconductor Terahertz Technology. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118920411.

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L, Woolard Dwight, Loerop William R, and Shur Michael, eds. Terahertz sensing technology. River Edge, N.J: World Scientific, 2003.

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Yu, Jianjun. Broadband Terahertz Communication Technologies. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3160-3.

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Peiponen, Kai-Erik, Axel Zeitler, and Makoto Kuwata-Gonokami, eds. Terahertz Spectroscopy and Imaging. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-29564-5.

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Book chapters on the topic "Terahertz"

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Weik, Martin H. "terahertz." In Computer Science and Communications Dictionary, 1762. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_19348.

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Pala, Nezih, Ahmad Nabil Abbas, Carsten Rockstuhl, Christoph Menzel, Stefan Mühlig, Falk Lederer, Joseph J. Brown, et al. "Terahertz." In Encyclopedia of Nanotechnology, 2653. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100826.

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Schuth, Michael, and Wassili Buerakov. "Terahertz." In Handbuch Optische Messtechnik, 506–13. München: Carl Hanser Verlag GmbH & Co. KG, 2017. http://dx.doi.org/10.3139/9783446436619.081.

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Schuth, Michael, and Wassili Buerakov. "Terahertz." In Handbuch Optische Messtechnik, 506–13. München, Germany: Carl Hanser Verlag GmbH & Co. KG, 2017. http://dx.doi.org/10.1007/978-3-446-43661-9_82.

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Mittleman, Daniel. "Terahertz Imaging." In Springer Series in Optical Sciences, 117–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45601-8_3.

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Zhang, Xi-Cheng, and Jingzhou Xu. "Terahertz Radiation." In Introduction to THz Wave Photonics, 1–26. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0978-7_1.

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Cumming, David R. S., Timothy D. Drysdale, and James P. Grant. "Terahertz Control." In Springer Series in Optical Sciences, 179–202. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-3837-9_7.

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Bründermann, Erik, Heinz-Wilhelm Hübers, and Maurice F. Kimmitt. "Terahertz Imaging." In Springer Series in Optical Sciences, 301–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-02592-1_7.

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Murphy, J. Anthony, and Créidhe O’Sullivan. "Terahertz Optics." In Terahertz Spectroscopy and Imaging, 29–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29564-5_2.

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Zurk, L. M., and S. Schecklman. "Terahertz Scattering." In Terahertz Spectroscopy and Imaging, 95–116. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29564-5_5.

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Conference papers on the topic "Terahertz"

1

Grischkowsky, D., C. Fattinger, Martin Van Exter, and Soren R. Keiding. "Applications of terahertz beams." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.tub1.

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Using our newly developed techniques of terahertz optics,1 we have generated well-collimated beams of freely propagating subpicosecond electromagnetic pulses. By comparing the high speed response of different receiver-transmitter combinations, we have optimized the system so that the terahertz pulses are detected with subpicosecond resolution and with signal-to-noise ratios of more than 1000:1. With this terahertz source, time domain spectroscopic measurements of single crystals of sapphire, quartz, MgO, and high resistivity silicon have provided the most accurate characterization of their terahertz dielectric properties to date. When the terahertz beams propagate through as little as 20 cm of laboratory air, a 50-ps duration oscillatory structure appears after the main subpicosecond pulse. This structure is caused by the absorption and dispersion of several strong resonance lines in water vapor. Using a controlled ambient atmosphere for the terahertz beam path, we have made the most accurate measurements to date of the absorption strengths of the nine strongest lines of water vapor in the spectral region from 0.2 to 1.5 THz.
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Torralbo-Campo, Lara, Eric Dorsch, Felix Battran, Xiang Lue, Holger T. Grahn, Dieter Koelle, Reinhold Kleiner, and Jozsef Fortágh. "A Rydberg Gas Terahertz Sensor." In Optical Sensors. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/sensors.2022.sm3c.3.

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We report the ongoing development of a Rydberg atom-based detector for sensing terahertz radiation. It will be used to characterize the emission properties of a superconducting terahertz emitter and a terahertz quantum-cascade laser.
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Grischkowsky, Daniel. "Terahertz radiation and spectroscopy." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.fd.1.

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Various mechanisms for generating short pulses of terahertz radiation by excitation with ultrafast laser pulses are described, together with optoelectronic and bolometric means of terahertz detection.
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Kutas, Mirco, Björn Erik Haase, Felix Riexinger, Joshua Hennig, Tobias Pfeiffer, Daniel Molter, and Georg von Freymann. "Quantum-Inspired Terahertz Sensing." In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/quantum.2022.qtu2a.17.

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Quantum-inspired terahertz sensing using nonlinear interferometers enables detection of terahertz spectral properties while only measuring visible light, which never interacted with the sample. Applications in spectroscopy and thickness determination are presented.
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Kutas, Mirco, Björn Erik Haase, Felix Riexinger, Joshua Hennig, Tobias Pfeiffer, Daniel Molter, and Georg von Freymann. "Recent Progress in Terahertz Quantum Sensing." In Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.ctup3d_01.

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Terahertz quantum sensing using nonlinear interferometers allows for measuring terahertz spectral properties of samples while only detecting visible light, which never interacted with the sample. We discuss possibilities for terahertz applications in spectroscopy and imaging.
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Cai, Jiahua, Jiangping Zhou, Hongji Xu, Yueming Sun, Yuxuan Qu, and Xiaojun Wu. "Caries Detection using Terahertz Birefringence." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jw3b.171.

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Terahertz birefringence phenomenon in enamel is, for the first time, observed via terahertz time-domain spectroscopy, which is weakened or even disappeared when caries is formed, expecting to be applied in early diagnosis of dental caries.
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Deng, Qiuzhuo, Lu Zhang, Hongqi Zhang, Zuomin Yang, Xiaodan Pang, Vjačeslavs Bobrovs, Sergei Popov, et al. "Quantum Noise Secured Terahertz Communications." In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.w2a.33.

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The quantum noise based terahertz signal encryption scheme is proposed, a 16 Gbits-1 secure terahertz communication system at 300 GHz with the optical communication realms is demonstrated, taking a significant step toward high-security wireless communications.
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Kumagai, Motohiro, Shigeo Nagano, Yoshihisa Irimajiri, Isao Morohashi, Hiroyuki Ito, Yuko Hanado, and Iwao Hosako. "Terahertz wave generation and terahertz reference transfer." In 2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE, 2014. http://dx.doi.org/10.1109/irmmw-thz.2014.6956265.

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Sengupta, Kaushik, Xuyang Lu, Suresh Venkatesh, and Xue Wu. "Terahertz to bits and bits to terahertz." In NANOCOM '20: The Seventh Annual ACM International Conference on Nanoscale Computing and Communication. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3411295.3411319.

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Boland, Jessica L., Kun Peng, Sarwat Baig, Diamshid Damry, Patrick Parkinson, Lan Fu, Hark Hoe Tan, et al. "The Route to Nanoscale Terahertz Technology: Nanowire-based Terahertz Detectors and Terahertz Modulators." In 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2018). IEEE, 2018. http://dx.doi.org/10.1109/irmmw-thz.2018.8510319.

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Reports on the topic "Terahertz"

1

Zhang, X. C. Terahertz Microscope. Fort Belvoir, VA: Defense Technical Information Center, May 2010. http://dx.doi.org/10.21236/ada533321.

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Eastman, Lester F., Quentin Diduck, and Barbaros Aslan. Terahertz Diode Development. Fort Belvoir, VA: Defense Technical Information Center, March 2009. http://dx.doi.org/10.21236/ada495426.

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Taylor, Antoinette. Novel Terahertz Metamaterials. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1107160.

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Shur, Michael. Terahertz Plasma Wave Electronics. Fort Belvoir, VA: Defense Technical Information Center, June 2001. http://dx.doi.org/10.21236/ada398910.

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Lyo, Sungkwun Kenneth, Michael Clement Wanke, John Louis Reno, Eric Arthur Shaner, Albert D. Grine, and Todd A. Barrick. Terahertz-based target typing. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/948692.

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Pavlidis, Dimitris, Jack East, and Linda Katehi. Solid-State Terahertz Sources. Fort Belvoir, VA: Defense Technical Information Center, June 2001. http://dx.doi.org/10.21236/ada389748.

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Moshirfatemi, Farnoosh. Communicating at Terahertz Frequencies. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.5525.

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Melinger, Joseph S. Detection of Threat Materials Using Terahertz Waveguides and Long Pathlength Terahertz Spectroscopy. Fort Belvoir, VA: Defense Technical Information Center, May 2015. http://dx.doi.org/10.21236/ada624164.

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Heimbeck, Martin S., Henry O. Everitt, and Amy E. Frees. Near-Field Terahertz Transmission Imaging at 0.210 Terahertz Using a Simple Aperture Technique. Fort Belvoir, VA: Defense Technical Information Center, October 2015. http://dx.doi.org/10.21236/ada625191.

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Lang, Wei, Jeffrey M. Warrender, and X. C. Zhang. Chirp-Pulse Terahertz Range Profiling. Fort Belvoir, VA: Defense Technical Information Center, October 2007. http://dx.doi.org/10.21236/ada611255.

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