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 65 for “"Optical waveguides"”.
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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 Stimulated Brillouin scattering (SBS) in optical waveguide is an important nonlinear effect results from the coherent interactions between optical and acoustic modes. The SBS can be considered as a primary obstacle effect in limiting the power scaling in many high power photonic devices …
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The characterisation of acoustic waves in optical waveguides
… The Stimulated Brillouin scattering (SBS) in optical waveguide is an important nonlinear effect results from the coherent interactions between optical and acoustic modes. The SBS can be considered as a primary obstacle effect in limiting the power scaling in many high power photonic devices …
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Fabrication of Hollow Optical Waveguides on Planar Substrates
… dissertation presents the fabrication of hollow optical waveguides integrated on planar substrates. Similar in principle to Bragg waveguides and other photonic crystal waveguides, the antiresonant reflecting optical waveguide (ARROW) is used to guide light in hollow cores filled with liquids or …
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Holographic Control of Light Propagation in Optical Waveguides
Optical waveguides form the backbone of the internet and have also been a driving technology in medical imaging and optical sensing. Modern holography can now be used to control every aspect of light propagation along an optical waveguide. The application of holographic techniques offers the …
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Modification of glasses and optical waveguides using high electric fields
… content. Intrinsic third-order optical nonlinearity χ(3) up to thirty times higher than silica have been measured in bismuth-based compounds, and even larger values are potentially achievable.<br/><br/>In this thesis, a reliable procedure to induce large and stable second order …
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The control of gold and latex particles on optical waveguides
The trapping of microparticles by optical methods using a focussed laser beam, known as optical tweezers, has evolved rapidly in the last thirty years. However this process is limited to the trapping of a small number of particles. Evanescent wave trapping allows simultaneous trapping of many …
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An experimental study of proton-exchanged lithium niobate optical waveguides
… of the problems associated with proton-exchanged waveguides, and to investigate possible solutions. Chapter 1 gives a brief introduction to the properties of lithium niobate, and discusses the methods available for fabricating optical waveguides in the bulk material, with particular emphasis on …
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Microfabricated pressure transducers based on anti-resonant reflecting optical waveguides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Analysing curved optical waveguides using the finite difference beam propagation method
Photonic integrated circuits (PICs) integrate optical components on a single semiconductor chip. As time has progressed, advances have been made allowing the components of these PICs to become smaller and smaller. It is now possible to place many of these components on a single PIC. As these …
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Frequency conversion in nonlinear optical waveguides : from classical to quantum applications
… physics. It combines the phenomena of nonlinearoptical frequency conversion with waveguiding and coupling, taking advantage of new opportunities presented by advances in fabrication technologies of micro- and nano-waveguides. In this dissertation an in-depth analysis of quantum and classical …
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Frequency conversion in nonlinear optical waveguides : from classical to quantum applications
… physics. It combines the phenomena of nonlinearoptical frequency conversion with waveguiding and coupling, taking advantage of new opportunities presented by advances in fabrication technologies of micro- and nano-waveguides. In this dissertation an in-depth analysis of quantum and classical …
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Characteristics of semiconductor optical waveguides fabricated by impurity-induced layer disordering
… induced layer disorder-delineated buried channel optical waveguide non-rectilinear routing structures are found to have loss properties equal to or better than other planar optical waveguides. With 3 dB loss angles of 3$\sp\circ$, for simple abrupt bends, and 7$\sp\circ$, for modified abrupt …
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Thin film integrated optical waveguides for biosensing using local evanescent field detection
… to be measured using near field scanning optical microscopy or a silicon photo detector array. The fabrication and characterization of a waveguide device with a coupled light source was accomplished. The evanescent field response to thin films of patterned photoresist was found using NSOM. …
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The application of planar optical waveguides to absorption spectrometry in flow injection analysis
… 9.2 microliter flow cell sensor. The planar waveguides used had 2 to 3 orders of magnitude greater sensitivity than typical internal reflection elements. The analytical working range obtained for urea determinations was from 0 to 20 mM urea at a rate of 30 samples per hour. A description of …
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Characterization of S-bend optical waveguides fabricated by impurity- and vacancy-induced layer disordering
The routing capabilities of waveguides defined by Zn, SiO$\sb2$, and In/SiO$\sb2$ Impurity-Induced Layer Disordering (IILD) of a single GaAs quantum-well graded barrier laser structure are investigated using raised-cosine S-bend geometries. The 3-dB transition length for a 100 $\mu$m offset S-bend …
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Ceramic coatings for silica and sapphire optical waveguides for high temperature embedding and sensing
… and sensing. The lifetimes of these waveguides are extended considerably by suitably coating them. Plastic coated silica waveguides are gradually replacing metal coaxial cables used in communications and they have been used successfully in various types of sensing. Unfortunately …
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