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Dissertations / Theses on the topic 'Waveguide'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Fuhse, Christian. "X-ray waveguides and waveguide-based lensless imaging." Doctoral thesis, [S.l.] : [s.n.], 2006. http://webdoc.sub.gwdg.de/diss/2006/fuhse.

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2

Lu, Junjie. "Modelling optical waveguide bends and applications to plasmon-polariton waveguides." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26516.

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Optical waveguide bends are key building blocks in many integrated optical components. Accurate numerical modelling of these bends is of great practical value to the design of the integrated optical technology. Analyzed in this thesis are the propagation characteristics of optical waveguide bends based on the method of lines (MoL), not only for its good numerical performances (accuracy, speed of computation and minimal memory requirements), but also for its high suitability for the analysis of waveguide structures. This thesis gives the detailed formulation for the calculation of the waveguide
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3

Huang, Xuefeng. "Ion implanted optical waveguides and laser ablated Bragg waveguide gratings." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364140.

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4

Kim, Jinkee. "Analysis of optical waveguide discontinuities and design of planar prisms in waveguides." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/13878.

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5

Cockrell, Kevin L. "Understanding and utilizing waveguide invariant range-frequency striations in ocean acoustic waveguides." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/65275.

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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and the Woods Hole Oceanographic Institution), February 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 163-170).<br>Much of the recent research in ocean acoustics has focused on developing methods to exploit the effects that the sea surface and seafloor have on acoustic propagation. Many of those methods require detailed knowledge of the acoustic properties of the seafloor and the sound speed pro
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6

Midgley, Stuart. "Quantum waveguide theory." University of Western Australia. School of Physics, 2003. http://theses.library.uwa.edu.au/adt-WU2004.0036.

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The study of nano-electronic devices is fundamental to the advancement of the semiconductor industry. As electronic devices become increasingly smaller, they will eventually move into a regime where the classical nature of the electrons no longer applies. As the quantum nature of the electrons becomes increasingly important, classical or semiclassical theories and methods will no longer serve their purpose. For example, the simplest non-classical effect that will occur is the tunnelling of electrons through the potential barriers that form wires and transistors. This results in an increase in
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7

Bain, Fiona Mair. "Yb:tungstate waveguide lasers." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1698.

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Lasers find a wide range of applications in many areas including photo-biology, photo-chemistry, materials processing, imaging and telecommunications. However, the practical use of such sources is often limited by the bulky nature of existing systems. By fabricating channel waveguides in solid-state laser-gain materials more compact laser systems can be designed and fabricated, providing user-friendly sources. Other advantages inherent in the use of waveguide gain media include the maintenance of high intensities over extended interaction lengths, reducing laser thresholds. This thesis present
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8

Tan, Shunyi. "Holographic waveguide display." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610434.

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9

Choudhary, Amol. "Ultrafast waveguide lasers." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/362084/.

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Mode-locked lasers with repetition-rates in excess of 1 GHz have many applications in areas such as optical sampling, non-linear microscopy, and optical frequency metrology. To date there have been very few demonstrations of such high repetition-rate lasers with sub-picosecond operation and high average power. This thesis deals with the realisation of such compact sources using an integrated-optics platform. Waveguides offer certain key advantages, including a low threshold power, high slope efficiency, compatibility with monolithic devices, and a low mode-locking threshold, making them very p
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10

Hettrick, Simon James. "Tapered waveguide lasers." Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15471/.

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The work reported in this thesis concerns the design and fabrication of tapered waveguide lasers to allow efficient, high-power diode-pumping and produce diffraction-limited, near-symmetrical output, whilst maintaining a monolithic design compatible with integrated optical circuits. The design rules required for efficient operation of a tapered waveguide are derived, and applied to the fabrication of tapered waveguides by thermal ion exchange (TIE) in Nd-doped borosilicate glass. Ti:sapphire pumped laser operation of these waveguides indicates efficient (40%) and low-loss (0:2dBcm-1) operation
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11

Kinsey, Geoffrey Sherwood. "Waveguide avalanche photodetectors /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008370.

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12

Barkley, Edward R. (Edward Robert). "The integration of InP /InGaAsP ridge waveguide structures with dielectric waveguides on silicon." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38682.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2007.<br>Includes bibliographical references (p. 261-271).<br>Chip-to-chip optical interconnect technology, which is being explored as a potential replacement for copper chip-to-chip interconnects at data transmission rates exceeding 10 Gb/s, is one of several technologies that could be enabled by the monolithic integration of III-V optoelectronic devices on a silicon integrated circuit. Two significant capabilities required to achieve this monolithic integration were addresse
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13

Juvalta, Flurin. "Light-induced waveguides, waveguide arrays and switches in photorefractive LiTaO₃ and Sn₂P₂S₆ /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18105.

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14

Høvik, Jens. "Photonic Crystal Waveguide Fabrication." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19277.

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This research is entirely devoted to the study and fabrication of structures with periodic dielectric constants, also known as photonic crystals (PhCs). These structures show interesting dispersion characteristics which give them a range of prohibited frequencies that are not allowed to propagate within the crystal. This property makes them suited for a wide array of photonic-based components. One-dimensional photonic crystals are already commercialized and are of widespread use in for example thin-film optics, and two-dimensional PhCs are available in the form of photonic crystal fibers.Much
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15

Sibbald, Christopher L. "Open-ended waveguide structures." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5576.

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16

Zhong, Jiang-Jian. "Tapered waveguide display panel." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620034.

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17

Lau, Fat Kit. "Tapered waveguide laser diodes." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611648.

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18

Zhang, Cui. "Integrated waveguide optical isolator." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/7994/.

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This project is aimed at the integration of a polarisation-insensitive optical waveguide isolator on a Silicon-on-Insulator platform. The final device must provide comparable performance for both Transverse Electric and Transverse Magnetic modes at a wavelength of 1550 nm. This is achieved through two core components, a 45° Nonreciprocal Polarisation Mode Converter, and a 45° Reciprocal Polarisation Mode Converter. In order to realise the Nonreciprocal Polarisation Mode Converter, several materials were investigated, all consisting of Silicon-on-insulator substrates with various thicknesses of
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19

MORIWAKI, Osamu, Ken-ichi SATO, Hiroshi HASEGAWA, and Shoji KAKEHASHI. "Formulation of Waveguide Connection for Waveband MUX/DEMUX Using Concatenated Arrayed-Waveguide Gratings." Institute of Electronics, Information and Communication Engineers, 2007. http://hdl.handle.net/2237/14992.

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20

Field, Paul A. "Wavelength stabilisation for high power CO2 slab waveguide lasers using waveguide surface patterning." Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/472.

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21

Klaren, Jonathan J. (Jonathan James). "Mode-matching analysis for discontinuities in waveguide and application to a waveguide circular polarizer." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36466.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.<br>Includes bibliographical references (leaves 70-71).<br>by Jonathan J. Klaren.<br>M.S.
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22

Trantanella, Charles Joseph 1967. "A waveguide power balance theorem applied to a parallel plate waveguide with an iris." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/278047.

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We study the problem of wave propagation in a parallel plate waveguide with an iris. We use Green's function techniques to model the field behavior inside the waveguide. We formulate an integral equation whose solution will allow us to solve for the fields everywhere within the guide. We solve the integral equation by employing both the method of moments and a low-frequency approximation. We next develop a power balance theorem which relates the modal coefficients of the propagating modes in an exact relation. From the numerical solution, we can generate numerical approximations to the modal c
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23

Johansson, Christer. "Numerical methods for waveguide modeling /." Stockholm : Numerical Analysis and Computing Science (NADA), Stockholm university, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-992.

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24

Walker, David B. "Ferroelectric liquid crystal waveguide modulators." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13277.

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25

Shackleton, Christian John. "Resonators for slab-waveguide lasers." Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1387.

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26

Wang, Xu. "Silicon photonic waveguide Bragg gratings." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45687.

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Silicon is the most ubiquitous material in the electronics industry, and is now expected to revolutionize photonics. In just over ten years, silicon photonics has become a key technology for photonic integrated circuits. By taking advantage of silicon-on-insulator (SOI) wafers and the existing complementary metal-oxide semiconductor (CMOS) fabrication infrastructure, silicon photonic chips are now being delivered with low cost and rapidly increasing functionality. This thesis presents the integration of a fundamental optical device - Bragg grating - into SOI waveguides. Various types of wav
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27

Abram, Richard Henry. "High power waveguide array lasers." Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/622.

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28

Reilly, Mark Alexander. "Integrated polymer waveguide optical amplifiers." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614010.

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29

Cao, Qiusheng. "Planar waveguide CO2 laser amplifiers." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/1224.

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30

Zourob, Mohammed M. "Development of optical waveguide biosensors." Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.743091.

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31

Field, Simon John. "Ion implanted crystal waveguide lasers." Thesis, University of Southampton, 1992. https://eprints.soton.ac.uk/399433/.

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This thesis reports the first use of He+ implantation to create integrated optic waveguide lasers, by modifying the refractive index of bulk laser host crystals. He+ ion implantation produces a variety of refractive index changes within different target (implanted) crystals which can be used to create planar and channel optical waveguides with propagation losses of the order of 1dB/cm. The spectroscopic properties of the laser impurity dopant in the target crystal are generally not altered drastically by the implantation. The fluorescence lifetime is typically unchanged in the waveguide compar
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32

Harris, Richard David. "Waveguide surface plasmon resonance biosensor." Thesis, University of Southampton, 1996. https://eprints.soton.ac.uk/398739/.

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This thesis reports the design and development of the first waveguide surface plasmon resonance (SPR) biosensor for pesticide analysis. The integrated optical format allows the fabrication of a compact sensor that may be connected to optical fibre; necessary steps towards a portable optical biosensor. A major advantage of the integrated optical approach is the possibility of fabricating multiple sensors on one substrate, and hence testing for multiple analytes in one basic assay. The SPR structure incorporates a metal film that may be employed as an electrode to study the electrochemical contr
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33

Adikan, Faisal Rafiq Mahamd. "Direct UV-written waveguide devices." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/65507/.

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This thesis describes a series of experimental studies concerning waveguide structures based on the direct UV and direct grating writing fabrication techniques. The latter approach allows simultaneous definition of waveguide structures and Bragg gratings. The first result of this work describes the fabrication and characterisation of small angle X-couplers that exhibit low polarisation and wavelength dependence. Maximum and minimum coupling ratios of 95% (±0.8%) and 1.9% (±1%) respectively with typical excess loss of 1.0dB (±0.5dB) were recorded. Device modelling using Beam Propagation Method
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34

Ross, Susan E. "DEVELOPMENT OF SPECTROELECTROCHEMICAL WAVEGUIDE SENSORS." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin971364855.

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35

Chang, Cheng-Chun. "Coupled-waveguide Fabry-Perot resonator." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10062009-020056/.

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36

Sevim, Koray Sözüer H. Sami. "One dimensional photonic crystal waveguide/." [s.n.] [s.l.], 2004. http://library.iyte.edu.tr/tezler/master/fizik/T000446.pdf.

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37

Pathak, Shantanu. "Resonant optical waveguide biosensor characterization." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3792.

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Thesis (M.S.)--West Virginia University, 2004.<br>Title from document title page. Document formatted into pages; contains viii, 109 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 107-109).
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38

Sandhu, Muhammad Yameen. "Monolithic integrated ceramic waveguide filters." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7489/.

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Design techniques for a new class of monolithic integrated high permittivity ceramic rectangular waveguide microwave filters are presented in this thesis. These filters enable a size reduction of 50 % as compared to air filled coaxial resonator filters with the same unloaded Q-factor. Initially, an integrated ceramic rectangular waveguide resonator structure is investigated. It consists of a metal plated high permittivity ceramic rectangular block with Q-factor comparable to transverse electromagnetic (TEM) coaxial resonator but in a much miniaturised volume with good out of band spurious perf
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39

GIBBONS, WAYNE MICHAEL. "ALL-OPTICAL NONLINEAR WAVEGUIDE DEVICES." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184212.

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The properties of all-optical nonlinear waveguide devices are investigated. In particular, the nonlinear directional coupler (NLDC) and nonlinear Mach-Zehnder interferometer (NLMZ) are analyzed using perturbation theory. The perturbation theory provides differential equations that describe the amplitude of the waveguide modes as a function of the propagation distance. To be practical, these waveguide devices require nonlinear phase shifts of π or more. Therefore, the theoretical investigation of these devices emphasizes their fabrication in bulk and multiple-quantum-well (MQW) gallium arsenide
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40

Wu, Liang. "Substrate integrated waveguide antenna applications." Thesis, University of Kent, 2015. https://kar.kent.ac.uk/50526/.

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The research objective of this thesis is to provide a better solution for signal interference and reduce the size of waveguide antenna. The background investigations of different waveguide fabrication technologies and switch control methods are detailed in the introductory part of this thesis. Several novel substrate integrated waveguide (SIW) antennas for different purpose are demonstrated in the body of the thesis. The designs are mainly divided into two kinds. The first focuses on the switch beam SIW antennas working at 2.4 GHz frequency band. Compared to the corresponding waveguide antenna
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41

Sheel, Soumya. "Refinements to the design of waveguide slot arrays." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/131880/1/Soumya_Sheel_Thesis.pdf.

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Existing design techniques for waveguide slot arrays have certain limitations. This doctoral thesis presents a detailed mathematical derivation to account for higher-order coupling between main line slots and neighbouring radiating slots. New expressions are derived for the coupling slot equivalent impedance that accommodate phase differences between scattering parameters and higher-order coupling. The thesis also presents a design method that accounts for arbitrary levels of waveguide loss, and one that takes asymmetry of slot fields into account. In addition, a new single-layer feed structur
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42

Ergül, Adem. "Fabrication and Characterization of Superconductive Coplanar Waveguide Resonators : Fabrication and Characterization of Superconductive Coplanar Waveguide Resonators." Licentiate thesis, KTH, Applied Physics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10419.

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<p>The objective of this thesis is to evaluate a generic process for fabrication and characterization of the Superconductive coplanar waveguide (CPW) resonators. Superconductive CPW resonators with various lengths and shapes are designed to investigate their electrical and magnetic properties as well as resonance properties and sensitivities. In the first part of thesis, two different models are introduced in order to estimate the nonlinear kinetic inductance of a superconducting CPW resonator. The first model is based on Bean critical-state model and the second one is based on current depende
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43

Wang, Qing. "Single-Frequency and Mode-Locked Glass Waveguide Lasers and Fiber-Optic Waveguide Resonators for Optical Communications." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195101.

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Single-frequency and mode-locked silver film ion-exchanged glass waveguide lasers as well as all-optical clock recovery based on birefringent fiber resonators have been experimentally and theoretically studied. The theory, modeling and fabrication process of silver film ion-exchange techniques, have been discussed and presented.The UV-written gratings on both IOG-1 active and passive glass have been studied. For the first time, with a high quality narrowband grating UV-printed on the passive section of a hybrid glass, a DBR waveguide single-frequency laser is demonstrated with the linewidth le
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44

Lombardo, David. "Design and Fabrication of Suspended Waveguides With Photonic Grating Structures." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1591796311145344.

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45

Ainsworth, Joseph. "A numerical model of the propagation characteristics of multi-layer ridged substrate integrated waveguide." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/a-numerical-model-of-the-propagation-characteristics-of-multilayer-ridged-substrate-integrated-waveguide(23c69a19-694c-41c6-8870-5c09e5734362).html.

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A transmission line format is presented which takes the form of a Multilayer Ridged Substrate Integrated Waveguide, for which signal energy is transmitted within standard PCB substrates, within a wave-guiding structure formed from conducting tracks in the horizontal plane and arrays of through-plated vias in the vertical plane. The Substrate Integrated Waveguide (SIW) is a recent development into which research is so far concentrated on single-layer rectangular variants which, like traditional rectangular waveguide, are amenable to analytic computation of the cutoff eigenvalues. Recent publica
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46

Roncone, Ronald Louis. "An experimental and theoretical investigation of waveguide scatter, with applications to solution-deposited silica-titania planar waveguides." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/186042.

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A theoretical and experimental investigation of scatter from surface roughness and core refractive index fluctuations in planar waveguides was performed, with an emphasis placed on applications in solution-deposited SiO₂-TiO₂ (silica titania) planar waveguiding systems. A perturbation theory was used to model TE₀ mode scattering from surface and volume microstructure, and to predict attenuation when provided with the necessary waveguide and scattering parameters. Final forms for the equations predicting surface and volume scatter losses into the cover and substrate regions of the waveguides we
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47

Rabady, Rabi Ibrahim. "Waveguide grating mirror for laser resonators." Connect to online resource - WSU on-site and authorized users, 2003.

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48

Dogan, Doganay. "Dual Polarized Slotted Waveguide Array Antenna." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613016/index.pdf.

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An X band dual polarized slotted waveguide antenna array is designed with very high polarization purity for both horizontal and vertical polarizations. Horizontally polarized radiators are designed using a novel non-inclined edge wall slots whereas the vertically polarized slots are implemented using broad wall slots opened on baffled single ridge rectangular waveguides. Electromagnetic model based on an infinite array unit cell approach is introduced to characterize the slots used in the array. 20 by 10 element planar array of these slots is manufactured and radiation fields are measured. The
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49

Mehrotra, Sandeep. "Analysis of optical waveguide fabrication processes." Ohio : Ohio University, 1986. http://www.ohiolink.edu/etd/view.cgi?ohiou1183140884.

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50

Smith, Nathan. "Substrate integrated waveguide circuits and systems." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=92388.

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This thesis investigates substrate integrated waveguide (SIW) based interconnects, components, and systems. SIWs are high performance broadband interconnects with excellent immunity to electromagnetic interference and suitable for use in microwave and millimetre-wave electronics, as well as wideband systems. They are very low-cost in comparison to the classic milled metallic waveguides as they may be developed using inexpensive printed circuit board (PCB) fabrication techniques. In this thesis, the interconnect design is studied by investigating the modes supported by SIW using fullwave simula
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