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Dissertations / Theses on the topic 'Teraherz Waveguides'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Tanvir, Huda Muhammed. "Finite element characterisation of terahertz waveguides and devices." Thesis, City University London, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.548372.

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2

Episkopou, Elpida. "Reconfigurable optically-controlled waveguide for terahertz applications." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/42226.

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The development of tunable waveguide components for systems that require multifunctionality, at terahertz frequencies is investigated using the photoconductivity e ect. Specifically, by the photo-generation of free charged carriers highly conducting plasma regions are created and by changing the light pattern in real time, various tunable components can be implemented. The aim of this thesis is to present a novel reconfigurable optically-controlled terahertz waveguide switch as an illustrative example of this approach, addressing the challenges and limitations involved in simulation, implement

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3

Stone, Edmund K. "Semiconductor surface plasmons : a route to terahertz waveguides and sensors." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3582.

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The terahertz regime has until recently been some what neglected due to the difficulty of generating and measuring terahertz radiation. Terahertz time domain spectroscopy has allowed for affordable and broadband probing of this frequency regime with phase sensitive measurements (chapter 3). This thesis aims to use this tool to add to the knowledge of the interactions between electromagnetic radiation and matter specifically in regard to plasmonics. This thesis covers several distinct phenomena related to plasmonics at terahertz frequencies. The generation of terahertz radiation from metal nano

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4

Hong, Binbin. "Photonic crystal millimetre wave and terahertz waveguides and functional components." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20998/.

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This work discusses both the theoretical and experimental guidance of low-loss single-mode millimetre-wave (mmW) and terahertz (THz) waves within microstructured photonic crystal fibre or waveguides, as well as functional components which can be built upon them. The aim of this work is to provide good interconnects for mmW and THz system. The interconnects are desired to be low loss, single mode, low dispersion, as well as easy to fabricate and integrate. In this work, photonic crystal structures, which can easily manipulate the wave-behaving photons by artificially changing its geometrical an

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5

Kohen, Stephen Michael 1980. "Electromagnetic modeling of terahertz quantum cascade laser waveguides and resonators." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/18058.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>Page 108 blank.<br>Includes bibliographical references (p. 103-107).<br>Finite-element numerical modeling and analysis of electromagnetic waveguides and resonators used in terahertz (THz) quantum cascade lasers (QCLs) is presented. Simulations and analysis of two types were performed: two-dimensional waveguides, and two- and three-dimensional resonators. Both metal-metal and semi-insulating (SI) surface-plasmon geometries were investigated. Waveguide simulations extend previous

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6

Ye, Chen. "Theoretical and experimental study of Terahertz wave generation in waveguides." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1322776062.

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7

Ganti, Satya Rama Naga Lakshmi. "Characterization and Modelling of Laser Micro-Machined Metallic Terahertz Wire Waveguides." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1347472107.

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8

Harris, C. Thomas (Charles Thomas). "Terahertz waveguide spectroscopy of two-dimensional plasmons in GaAs." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62452.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 85-88).<br>The electrical characteristics of high-mobility, two-dimensional electron gas (2DEG) systems, such as GaAs quantum wells, have been well-studied at low frequencies and in extreme conditions of high magnetic fields and ultralow temperatures. While high-frequency excitations of 2DEGs have been examined to some extent from microwave to terahertz (THz) frequencies, a fundamental understanding

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9

Pan, Yi. "Terahertz time-domain spectroscopy and near-field imaging of microstructured waveguides." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607613.

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This thesis presents studies of novel terahertz photonic devices, including photoconductive optoelectronic devices and guided-wave components, aimed at the development of next-generation terahertz systems. In chapter 2, a scalable interdigitated THz transmitter is designed to increase the output power and compared with a conventional 50 μm coplanar transmitter. In chapter 3, we compare four different receivers with different antenna geometries in terms of bandwidth and sensitivity. Then we describe a photoconductive near-field detector with a subwavelength aperture and its system integration a

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10

Quadir, A. "Finite element characterisation of plasmonic waveguides in terahertz and optical frequencies." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/17568/.

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In recent years plasmonic devices have become an interesting area of research due to the sub-wavelength confinement and propagation of radiation, allowing the design of very compact structures. Compact structures are necessary to make smaller integrated optical circuits. Due to the use of metals, plasmonic guides usually show more losses compared to the conventional dielectric guides. Therefore, plasmonic waveguides are not normally used for long distance transmission. However, they are promising for inter-chip or intra-chip communication and also have seen a lot of sensor applications. There

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11

Marshall, Owen Peter. "Terahertz quantum cascade lasers : photonic crystal waveguides and high frequency bias modulation." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608706.

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12

Wachsmuth, Matthew George. "Measurement and Characterization of Terahertz Radiation Propagating Through a Parallel Plate Waveguide." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/317.

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As the amount of study into the terahertz (THz) region of the electromagnetic spectrum steadily increases, the parallel plate waveguide has emerged as a simple and effective fixture to perform many experiments. The ability to concentrate THz radiation into a small area or volume enables us to analyze smaller samples and perform more repeatable measurements, which is essential for future research. While the fundamental physics of PPW transmission are understood mathematically, the practical knowledge of building such a fixture for the THz domain and taking measurements on it with a real system

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13

Gerhard, Marko [Verfasser]. "Development and Characterization of Broadband Metallic Waveguides and Compact Functional Components for Terahertz Technology / Marko Gerhard." München : Verlag Dr. Hut, 2014. http://d-nb.info/1059330172/34.

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14

Li, Cheng, Shin’ichiro Hayashi, Adrian Dobroiu, et al. "Terahertz-wave absorption in liquids measured using the evanescent field of a silicon waveguide." American Institite of Physics, 2008. http://hdl.handle.net/2237/11977.

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15

Shang, Xiaobang. "SU-8 micromachined terahertz waveguide circuits and coupling matrix design of multiple passband filters." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/3087/.

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This thesis presents the designs and measurement performance of nine SU-8 micromachined waveguide circuits operating at WR-10 band (75-110 GHz), WR-3 band (220-325 GHz) and WR-1.5 band (500-750 GHz). Two thick SU-8 photoresist micromachining processes, namely, the separate single-layer process and the joint two-layer process, are developed to fabricate these terahertz waveguide circuits. In order to achieve accurate and secure interconnections with measurement network analyzers, two calibrated measurement methods for micromachined waveguide circuits are proposed. The measurement performance of

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16

Higgins, James Alexander. "Measurement and Simulation of Parallel Plate Waveguide Structures in the Terahertz Region for Sensing and Material Characterization Applications." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/867.

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The THz region is a burgeoning field of research with applications in spectroscopy, integrated circuit fabrication, bio-medicine, and communications. Until recently, the THz region was largely unexplored, mainly due to the technical difficulties involved in making efficient and compact sources and detectors. As these challenges are addressed, the focus of research has shifted to practical applications, such as sensing and imaging. The focus of this thesis is to investigate the characterization of parallel plate waveguide multimode propagation and periodically notched resonant structures for us

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17

Weickhmann, Christian [Verfasser], Rolf [Akademischer Betreuer] Jakoby, and Jacob [Akademischer Betreuer] Arne. "Liquid Crystals Towards Terahertz: Characterisation and Tunable Waveguide Phase Shifters for Millimetre-Wave and Terahertz Beamsteering Antennas / Christian Weickhmann ; Rolf Jakoby, Jacob Arne." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1132248795/34.

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18

Teramoto, Kensuke. "Generation of intense terahertz surface waves on a metal wire by high-intensity laser driven electrons." Kyoto University, 2020. http://hdl.handle.net/2433/253079.

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19

Kernan, Forest Emerson. "Material Characterization of Zinc Oxide in Bulk and Nanowire Form at Terahertz Frequencies." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/510.

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Many new applications are being proposed and developed for use in the terahertz (THz) frequency region. Similarly, many new materials are being characterized for possible use in this area. Nanostructured forms are of particular interest since they may yield desirable properties, but they remain especially challenging to characterize. This work focuses on the characterization of zinc oxide (ZnO) in bulk and nanowire form. A method for characterizing nanostructures at THz by use of a parallel-plate waveguide (PPWG) is presented. This method is novel in that it is simple, both in theory and pract

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20

Rusina, Anastasia. "Optical and Terahertz Energy Concentration on the Nanoscale in Plasmonics." Digital Archive @ GSU, 2009. http://digitalarchive.gsu.edu/phy_astr_diss/36.

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We introduce an approach to implement full coherent control on nanometer length scales. It is based on spatiotemporal modulation of the surface plasmon polariton (SPP) fields at the thick edge of a nanowedge. The SPP wavepackets propagating toward the sharp edge of this nanowedge are compressed and adiabatically concentrated at a nanofocus, forming an ultrashort pulse of local fields. The profile of the focused waveform as a function of time and one spatial dimension is completely coherently controlled. We establish the principal limits for the nanoconcentration of the terahertz (THz) radiatio

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21

Pan, Mingming. "Terahertz wave-guided reflectometry system." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0062.

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Ce travail vise à construire un système compact et facile à mettre en œuvre de réflectométrie guidée par ondes térahertz (TGR) en tirant parti de l'émetteur-récepteur térahertz et des guides d'ondes pour diverses applications. Par rapport aux systèmes conventionnels utilisant une méthode quasi-optique, le nouveau concept a une configuration beaucoup plus simple et permet des applications de sondage à distance.Après des études sur le développement de la technologie térahertz, un émetteur-récepteur à double ACP à pompage optique et deux émetteurs-récepteurs radar à ondes continues modulées en fr

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22

Kim, Christopher Yong Jae. "Wave Chaos and Enhancement of Coherent Radiation with Rippled Electrodes in a Photoconductive Antenna." Diss., Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/412812.

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Physics<br>Ph.D.<br>Time-domain terahertz spectroscopy is now a well-established technique. Of the many methods available for a terahertz source for terahertz spectroscopy, the most widely used may be the GaAs-based photoconductive antenna, as it provides relatively high power at terahertz frequencies, commercially available up to 150 µW, and a wide-bandwidth, approximately 70 GHz to 3.5 THz. One of the limitations for developing more accurate and sensitive terahertz interrogation techniques is the lack of higher power sources. Because of our research interests in terahertz spectroscopy, we in

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23

Cao, Lei. "Optimisation de la détection térahertz (THz) par plasmons bidimensionnels (2D) dans des hétérostructures et de la propagation THz dans des guides d’onde planaires." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112014/document.

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Dans la gamme de fréquence térahertz (THz), les sources et les détecteurs couramment utilisés en optique et en électronique présentent une chute de performances. Mon travail de thèse s’inscrit dans le cadre de la recherche de composants THz peu onéreux, compacts, accordables en fréquence et facile à intégrer. Le premier volet de mon travail de thèse concerne la détection THz et met à profit le couplage entre une onde incidente THz et des plasmons d’un gaz bidimensionnel d’électrons (2DEG) via des réseaux métalliques déposés au-dessus d’hétérostructures. Quatre puits quantiques à base de semi-c

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24

Kurt, Hamza. "Photonic crystals analysis, design and biochemical sensing applications /." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-06252006-174301/.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2007.<br>Papapolymerou, John, Committee Member ; Adibi, Ali, Committee Member ; Citrin, David, Committee Chair ; Summers, Christopher, Committee Member ; Voss, Paul, Committee Member.

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25

Martínek, Tomáš. "Návrh nerezonančního držáku vzorku pro obecné použití v terahertzové elektronové spinové resonanční spektroskopii." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382623.

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Cílem diplomové práce je navrhnout konstrukční řešení držáků vzorků pro vysokofrekvenční elektron paramagnetickou resonanci. Předmětem návrhu je vytvořit jednoduchý zamykací systém pro spojování mikrovlnného vlnovodu a držáku vzorku. Dále navrhnout systém s řešením držáku pro více vzorků. Toto unikátní provedení držáku povede k několikanásobné úspoře celkového času měření vzorků. Poslední návrh spočívá v optimalizaci držáku vzorku s možností naklápění osy, kterou lze díky přímému napojení na piezoelektrický rotátor pootáčet s přesností na miliradiány. Oba typy držáku vzorku jsou navrženy s ohl

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26

Berenguer, Verdú Antonio José. "Analysis and design of efficient passive components for the millimeter-wave and THz bands." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/84004.

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This thesis tackles issues of particular interest regarding analysis and design of passive components at the mm-wave and Terahertz (THz) bands. Innovative analysis techniques and modeling of complex structures, design procedures, and practical implementation of advanced passive devices are presented. The first part of the thesis is dedicated to THz passive components. These days, THz technology suffers from the lack of suitable waveguiding structures since both, metals and dielectric, are lossy at THz frequencies. This implies that neither conventional closed metallic structures used at micr

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27

Mbonye, Marx. "Novel Waveguide Techniques in the Terahertz Frequency Range." Thesis, 2013. http://hdl.handle.net/1911/72001.

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Over the last decade, considerable research interest has peaked in realizing an efficient Terahertz (THz) waveguide for potential applications in imaging, sensing, and communications applications. Two of the promising candidates are the two-wire waveguide and the parallel-plate waveguide (PPWG). I present theoretical and experimental evidence that show that the two-wire waveguide supports low loss terahertz pulse propagation, and illustrate that the mode pattern at the end of the waveguide resembles that of a dipole. In comparison to the weakly guided Sommerfeld wave of a single wire waveguide

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28

Chan, Chih-yu, and 詹智宇. "FDFD Analysis of Hollow Terahertz Waveguides." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/19776797756845365704.

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碩士<br>國立中山大學<br>光電工程學系研究所<br>98<br>In most terahertz (THz) systems, the propagation of THz signals relies on metal or dielectric waveguides which suffer from high conductivity losses caused by the skin effect or dielectric losses resulted from the material absorption. Due to this reason, we propose and demonstrate a simple low-loss air-core tube strucutre for THz waveguiding. The simulation method we utilized is the finite-difference frequency-domain (FDFD) method with the perfectly matched layers (PMLs). The modal indices and propagation losses of the guided core modes on the THz tube wavegui

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29

Chang, Teng, and 張騰. "Analysis of Bent Terahertz Pipe Waveguides." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/99233910758671926213.

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碩士<br>國立雲林科技大學<br>電子與光電工程研究所碩士班<br>101<br>The terahertz (THz) region of the spectrum lies between microwaves and infrared. In Recent years, much of this interest has been inspired by the promise of valuable new applications for terahertz medical science, environment monitoring, imaging, and communication. To achieve the target of low-loss wave guiding in THz region, it is important to develop applicable THz waveguides. In practical applications, waveguides often suffer bending. Hence it is important to clarify the transmission characteristics of the THz pipe waveguide under bent condition. Dif

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30

Lu, Jen-Tang, and 呂任棠. "Terahertz Pipe-Waveguide-Based Components." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/33782590073534329501.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>99<br>THz technology has been proved to have high potential in a variety of fields such as high-speed telecommunications, bio imaging, molecular detection, material property study, anti-terrorism applications, and astronomical remote sensing. To facilitate THz technology, various kinds of THz fibers and waveguides have been extensively investigated in the past decade. Two years ago, we previously proposed a circular pipe waveguide for low-loss THz waveguiding. With commercial Teflon pipes, an attenuation constant lower than 0.001 cm-1 had been achieved. In this thes

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31

Pahlevaninezhad, Hamid. "Design and implementation of efficient terahertz waveguides." Thesis, 2012. http://hdl.handle.net/1828/3977.

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In this thesis, novel broadband waveguides capable of operating at terahertz (THz) frequencies are introduced. We explore in detail the two-wire waveguide showing that it can have absorption as low as 0.01 cm-1, fairly good coupling efficiency, and is free from group-velocity dispersion (GVD). We also propose two low loss, planar slot-line structures for guiding THz waves. Rigorous theoretical analyses, numerical simulations, and experimental results are presented to evaluate and verify the performance of the waveguides at THz frequencies. We also present a tapered structure to couple effectiv

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32

Bingham, Adam L. "Propagation through terahertz waveguides with photonic crystal boundaries." 2007. http://digital.library.okstate.edu/etd/umi-okstate-2512.pdf.

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33

Yeh, Chin-An, and 葉治安. "Study of Available Bandwidth for Terahertz Pipe Waveguides." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/37131538000023635660.

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碩士<br>國立雲林科技大學<br>電子工程系<br>102<br>To facilitate THz technology, it is essential to develop low-loss and low-cost THz waveguides. Pipe waveguide is one recently proposed hollow waveguide for THz transmission. It is a simple pipe with an air core surrounded by a dielectric cladding layer. The structure is leaky and the THz wave is confined in the air-core region by the mechanism of antiresonant reflection. One of the important properties of waveguide is the bandwidth. In this work, we numerically analyze the bandwidth of the THz pipe waveguide by examining the effects of cladding thickness and c

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34

HSIEH, SUNG LIN, and 謝松霖. "Investigation on Birefringence for Dumbbell-Shaped Terahertz Subwavelength Waveguides." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/244pwm.

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碩士<br>國立雲林科技大學<br>電子工程系<br>105<br>In this research, we numerically analyze a subwavelength dumbbell-shaped structure operating in the terahertz frequency range. This subwavelength structure can provide high birefringence to achieve polarization maintenance, so that it is helpful to solve the problem of signal decay when different polarizations are coupled. The dumbbell-shaped subwavelength structure is formed with two overlapping plastic fibers with circular cross-sections. In this thesis, we simulate the subwavelength dumbbell-shaped structure by a commercial software, COMSOL, which is implem

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35

Smith, Robert Levi. "Experimental evaluation of low-loss/non-dispersive terahertz waveguides." Thesis, 2019. http://hdl.handle.net/1828/10800.

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Low-loss waveguides with minimal dispersion are desired throughout the electromagnetic spectrum. These properties are difficult to achieve in the Terahertz (THz) region due to material and geometric constraints. This thesis focuses on the design, fabrication, and testing of waveguide-based devices using two promising technologies: the free-space metallic-slit waveguide (MSWG) and the coplanar strip (CPS) waveguide on a thin (1 um) commercial silicon nitride membrane. The work presented here differs from standard THz waveguide research which commonly uses the field radiated by a photoconductive

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"Modifying terahertz waveguide geometries: Bends, tapers, and grooves." Thesis, 2012. http://hdl.handle.net/1911/70206.

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Terahertz waveguides are the focus of considerable research interest due to their potential for sensing, imaging and communications applications. Two of the most promising designs are the metal wire waveguide and the parallel-plate waveguide. The metal wire waveguide exhibits excellent low loss and low dispersion characteristics. However, the radiation is only weakly coupled to the wire and the beam extends a great distance from the waveguide, which can lead to high bending loss. In my research I show that this large beam extent also gives a high degree of flexibility in the geometry required

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Yeh, Yi-Siang, and 葉毅祥. "Characteristics of Higher Order Modes for Bent Terahertz Pipe Waveguides." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/99589486891227358653.

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碩士<br>國立雲林科技大學<br>電子工程系<br>103<br>Recently, THz wave is widely used in imaging, information transmission, security, environment monitoring, biology and medical science. THz pipe waveguide is a low-cost and low-loss waveguide, having a simple structure with large air core surrounded by a thin dielectric layer. Its guiding mechanism is based on the anti-resonant reflection, making it a leaky waveguide. Waveguides often suffer bending in practical applications. In this research, characteristics of the bent terahertz pipe waveguides are investigated. In addition to the fundamental HE11 mode, the h

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Heshmat, Dehkordi Barmak. "Enhancing terahertz photoconductive switches using nanotechnology." Thesis, 2012. http://hdl.handle.net/1828/4498.

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In this thesis we use three main approaches to enhance the performance of terahertz photoconductive switches (THz PC switches). We first propose two novel materials (GaBiAs and carbon nanotubes) for the substrate. The resulting enhancement in THz emission and reception are significant for GaBiAs. As thoroughly analyzed and addressed in Chapter 2, both the emission bandwidth and the emission amplitude of the device are improved by these materials. A systematic study of CNTs predicts 2 orders of magnitude enhancement in THz emission and one order of magnitude enhancement in THz reception. Experi

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Shiran, Vahid. "Design and optimization of terahertz waveguides with low loss and dispersion." Thesis, 2020. http://hdl.handle.net/1828/12090.

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Electromagnetic waves in the terahertz spectral range have gained significant research focus due to their applications in various fields of science. To effectively generate and integrate terahertz waves in systems, appropriate waveguide design is critical. Conventionally waveguides have been used to control the propagation of electromagnetic waves. A waveguide with low loss and dispersion is always preferred. But achieving these characteristics is quite challenging especially if operating in the terahertz spectral range. There are inherent material and geometric limitations that exist f

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Lai, Yueh-Chi, and 賴岳圻. "Analysis of Coupling Efficiency for Terahertz Pipe Waveguides and Subwavelength Fibers." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/95032134879963868572.

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碩士<br>國立雲林科技大學<br>電子工程系<br>102<br>Low-cost and low-loss terahertz (THz) waveguide is essential for integrating and minimizing terahertz systems. To achieve low loss, it is important to investigate how to couple terahertz wave into waveguide effectively to enhance system performance. In this work, coupling efficiencies of terahertz pipe waveguides and subwavelength fibers are numerically studied. For the pipe waveguides, influences of operating frequency, waveguide shape, and polarization on coupling efficiency are examined. For the subwavelength fibers, the relationship between operating frequ

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41

Abelmouty, Walid Gomaa Abdelwahed. "Terahertz System-on-Chip using coplanar stripline transmission line on thin membrane." Thesis, 2020. http://hdl.handle.net/1828/12504.

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A guided-wave THz System-on-Chip (TSoC) is emerging as an attractive alternative to the routine free-space THz systems to reduce physical bulk, propagation loss, pulse dispersion and cost of free-space THz systems. Recently, our research group succeeded in demonstrating a novel waveguided TSoC based on the coplanar stripline (CPS) transmission lines on a 1 µm-thin Silicon Nitride membrane. The novelty of this membrane-based platform was bonding the transmitter and receiver directly on the transmission line to eliminate the radiation loss by the routine THz optics. Besides, the delicate thin-me

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Weickhmann, Christian. "Liquid Crystals Towards Terahertz: Characterisation and Tunable Waveguide Phase Shifters for Millimetre-Wave and Terahertz Beamsteering Antennas." Phd thesis, 2017. https://tuprints.ulb.tu-darmstadt.de/6216/1/diss-colourlink-ebook-13-verified.pdf.

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This thesis treats methods of characterisation of the anisotropic complex permittivity tensor of Liquid Crystals (LCs) from the microwave range up to the terahertz range, and the use thereof in a tunable waveguide phase shifter for a Ka band phased array antenna for space application. An overview of the relevant properties of LCs is presented and relevant concepts are introduced. The characterisation is carried out using two methods: a resonant cavity technique at 30 and 60 GHz, and transmission measurements at frequencies from 100 GHz to 8 THz. A numerical method based on the Finite Element

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Smith, Robert Levi. "Terahertz Field Enhancement by Optimized Coupling and Adiabatic Tapering." Thesis, 2014. http://hdl.handle.net/1828/5671.

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Waveguides are desirable components for energy transmission throughout the electromagnetic spectrum. This thesis experimentally examines a thick slot waveguide for THz guiding and field enhancement. The waveguide is machined from planar copper sheets using the novel technique of femtosecond laser micromachining. In-plane photoconductive THz coupling to a thick slot waveguide is demonstrated using Discontinuous Galerkin Time Domain (DGTD) simulation. The results reveal positive implications for broadband low-loss/dispersion transmission lines up to 1.5 THz.<br>Graduate<br>0544<br>0607<br>0756

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Liu, Jingbo. "Novel Devices for Terahertz Wave Imaging, Wave-guiding and Sensing." Thesis, 2013. http://hdl.handle.net/1911/71988.

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Several novel optical devices, which were designed to manipulate terahertz waves for broadband near-field imaging, wave-guiding (invisible space), and sensing (resonator), are presented in this thesis. We developed the original working concepts of each device, and demonstrated the prototype experimentally in our lab. The working concepts of physics were investigated in experiment, in simulation and in theoretical analysis. We exploited a tapered parallel-plate waveguide (PPWG) as a novel probe for broadband near-field imaging. This imaging probe consists of two metal plates with the plate sp

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Ho, Hsin-Jun, and 何欣潤. "Study Terahertz Surface Plasmon Polaritons in Gold Nanoparticles-Graphene on Plasmonic Waveguide." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/23fv2w.

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碩士<br>國立交通大學<br>電子物理系所<br>105<br>In this thesis, we investigate the surface plasmon resonance of graphene with gold nanoparticles (Au-NPs) by terahertz time-domain spectroscopy. Graphene has a great mobility in the terahertz spectral region. This property makes graphene a perfect material for the study of surface plasmon resonance. Adding Au-NPs on graphene can change graphene Fermi energy so the transmission and surface plasmon resonance frequency might be changed. We can observe the blue shifts of resonance frequency by enhancing the Au-NPs concentration. First, we prepare a nanostructure co

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Wan-LingTseng and 曾琬玲. "Terahertz wave sensing applications using the evanescent field of a plastic wire waveguide." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/a36jr6.

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碩士<br>國立成功大學<br>光電科學與工程學系<br>107<br>The thesis successfully demonstrates a plastic-wire terahertz (THz) waveguide is workable for sensing the minute molecules. The experimental observation first illustrates the relation between dielectric core geometry and the waveguide spectrum. The sample substrate with nano-porous structure is then revealed as the critical element of the waveguide sensing configuration. Based on the sensitivity calibration with the standard sample of DPBS (Dulbecco's Phosphate-Buffered Saline), various porous substrates are discussed for their sensing abilities while being

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Awad, Mohammad Ma'moun. "Terahertz imaging from projections using a parallel plate waveguide aperture in transmission and reflection mode." 2005. http://digital.library.okstate.edu/etd/umi-okstate-1330.pdf.

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Brandt, Michael [Verfasser]. "Superconducting hot electron bolometers on silicon nitride membranes for terahertz waveguide mixers / vorgelegt von Michael Brandt." 2004. http://d-nb.info/975577298/34.

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Jafarlou, Saman. "A Novel THz Photoconductive Source and Waveguide Based on One-dimensional Nano-grating." Thesis, 2013. http://hdl.handle.net/10012/7269.

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A terahertz photoconductive source structure with nano-grating electrodes is proposed. The resonance modes of the one-dimensional nano-grating and their affect the optical power absorption are studied. In addition, an approach for optimal design of the grating to maximize the photocurrent for different proposed DC biases, is presented. The dependence of the photocurrent on physical parameters of photomixer are analyzed. A fast analysis method for a new terahertz waveguide for photo-mixing is proposed. The wave-guiding mixer structure is a modified parallel plate waveguide (PPWG) in which the

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Bayat, Khadijeh. "Design, Simulation and Fabrication of Photonic Crystal Slab Waveguide Based Polarization Processors." Thesis, 2009. http://hdl.handle.net/10012/4444.

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The Photonic Crystal (PC) is a potential candidate for a compact optical integrated circuit on a solid state platform. The fabrication process of a PC is compatible with CMOS technology; thus, it could be potentially employed in hybrid optical and electrical integrated circuits. One of the main obstacles in the implementation of an integrated optical circuit is the polarization dependence of wave propagation. Our goal is to overcome this obstacle by implementing PC based polarization controlling devices. One of the crucial elements of polarization controlling devices is the polarization rotat

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