Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 492 for “"Waveguides"”.
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Conductive cylindrical surface waveguides
Cylindrical surface waveguides are extremely useful for transporting a surface wave in one dimension with low attenuation when the medium surrounding the surface waveguide has low attenuation. Additionally, surface waveguides guide a pure low-order mode with no cutoff frequency and low distortion, …
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Planar groove gap waveguides
With the increasing demand for wireless services and applications, the integration and coexistence of multi-standard and multi-band operations into a single device has led to intensive research in the design of tunable and reconfigurable planar devices. A planar medium to achieve this integration …
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Losses in polysilicon waveguides
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Magnetotransport in electron waveguides
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Numerical Modelling of Plasmonic Waveguides
… for different channel plasmon polariton (CPP) waveguides; trenched-groove. V-groove and the suggested three trenched structure over a specific spectral range (200 - 550 THz). The selected frequency band is chosen to ensure the existence of the CPP fundamental mode. The reported design offers a …
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Optical rectification in semiconductor waveguides
In this thesis, we study optical to microwave conversion and generation of ultrashort electrical pulses by the use of optical rectification at telecommunication wavelengths, λ = 1550 nm. By using optical rectification, an electromagnetic pulse is generated in a completely passive semiconductor …
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Nonlinear Photonics in Waveguides for Telecommunications
Bandwidth demands in global telecommunication infrastructures continue to rise and new optical techniques are needed to deal with massive data flows. Generating high bandwidth signals (> 40 GHz) using conventional modulation techniques is hindered by material limitations and fabrication …
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Biochemical sensing using Siloxane polymer waveguides
… advances in the integration of polymeric optical waveguides with electronics onto standard printed circuit boards (PCBs) allow the formation of cost-effective lab-on-achip modules suitable for mass production. This technology has been primarily designed for on-board data communication. The focus …
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Acoustic scattering by discontinuities in waveguides
… of acoustic waves by boundary discontinuities in waveguides is analyzed using the Method of Matched Asymptotic Expansions (MAE). Existing theories are accurate only for very low frequencies. In contrast, the theory developed in this thesis is valid over the entire range of frequencies up to the …
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Finite Element Analysis Of Left-handed Waveguides
In this work, waveguides with simultaneous negative dielectric permittivity and magnetic permeability, otherwise known as left-handed waveguides, are investigated. An approach of formulating and solving an eigenvalue problem with finite element method resulting in the dispersion relation of the …
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Development and applications of UV written waveguides
This thesis presents a description of the development of structures suitable for the technique of Direct UV Writing and demonstrates applications for which the resultant waveguiding devices may be used. The later stages of the thesis present several applications of the direct UV writing process and …
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Continuously tapered dielectric matching transitions for waveguides
… frequencies are used for matching air filled waveguides into dielectric filled waveguides for maser work or into dielectric rod antennas. Also dielectric loading has been shown to improve the performance of the ferrite isolators.</p> <p>The dielectric matching transitions that have been …
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The Modelling of Scattering in Corrugated Waveguides
No abstract available.
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Second harmonic generation in novel optical waveguides
… it has now become feasible in glass fibres and waveguides which are widely used in nonlinear optics. For instance, silica glass based Photonic Crystal Fibres (PCF) exhibit long coherence lengths and controllable optical properties such as chromatic dispersion despite low second order …
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Characterisation of acoustic waves in optical waveguides
… The guiding of acoustic wave in of optical waveguides allow interactions of light wave with the related phenomena of Brillouin Scattering (BS), Stimulated Brillouin Scattering (SBS) and Guided Acoustic Wave Brillouin Scattering (GAWBS). This thesis describes and studies the characteristics …
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On Waveguides With Anisotropic and Corrugated Boundaries
Made available in DSpace on 2014-12-12T20:54:31Z (GMT). No. of bitstreams: 1 7709116.pdf: 4244944 bytes, checksum: 67c4dd73934768771e966a17a731d51f (MD5) Previous issue date: 1976
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Waveguides Filled With Magnetoplasmas of Various Types
Made available in DSpace on 2014-12-08T22:23:57Z (GMT). No. of bitstreams: 1 6612282.pdf: 4241512 bytes, checksum: e10a28bf54cc0b0484af211d29d87cb4 (MD5) Previous issue date: 1966
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