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 26 for “"Waveguide Modes"”.
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Adaptive Control of Waveguide Modes in Two-Mode Fibers
… applications is how to precisely control the waveguide modes propagating within MMFs. In this thesis, we experimentally demonstrate a generic method for controlling the linearly polarized (LP) modes within a two-mode fiber (TMF). Our method is based on adaptive optics (AO), where one utilizes …
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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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Vertical waveguide-coupled microring resonator: Design and simulation
The frequency-selective waveguide coupler is an important component of wavelength division multiplexed (WDM) optical networks. The structural design of the coupler determines the performance, size, and spectral response. Recently, Chin and Ho demonstrated a conformal transformation method in …
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Depth Profiling in Thin Films via Waveguide Spectroscopy
… in the form of an asymmetric slab optical waveguide. Various methods for depth profiling thin dielectric films are also reviewed in a manner which illustrates the utility and limitations of depth profiling. The general theory of wave-guiding is also reviewed and then extended to develop the …
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Characterization of Optical Coupling and Back-reflection of Few Mode Fibers
… recent years. These techniques allow individual waveguide modes to be used as distinct channels. However, as with any versatile technique, it should be also useful and beneficial to extend its application to other areas. This work concerns itself with an initial conceptual design of a …
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The development of an ore pass level indicator
… ore pass could in theory propagate a number of waveguide modes. However, with the particular frequency chosen for the instrument reported here, the mode of propagation was the same mode as free-space. A FMCW radar system was designed for this specific application but had the advantage that …
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Modeling Compact Non-Volatile Photonic Switching Based on Optical Phase Change Material and Graphene Heater
… leveraging optical concentration in slot waveguide modes to significantly enhance interactions of light with PCM, thereby realizing a compact, efficient photonic switch. The crystalline-amorphous phase transitions are driven by an integrated single-layer graphene heater, providing high …
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Design of a high index contrast arrayed waveguide grating
Arrayed waveguide gratings (AWGs) are useful structures for the implementation of wavelength division multiplexing. The AWG consists of an input splitter, a dispersive waveguide array which creates the wavelength demultiplexing and multiplexing effects, and an output coupler. Because the dispersive …
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Polaritonics : an intermediate regime between electronics and photonics
… occurs within one or more of the slab waveguide modes of the crystal. Direct observation of phonon-polaritons is achieved using real-space imaging, which monitors and records the spatiotemporal evolution of phonon-polaritons within a ferroelectric crystal. The details of both broadband …
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Analysis of acoustic propagation in the region of the New England continental shelfbreak
… produce stronger coupling between the acoustic waveguide modes than expected. Arrival time wander and signal spread show variability attributable to the presence of a shelf water meander, changes in frontal configuration, and variability in the soliton field. The highly-coupled nature of the …
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Analysis of acoustic propagation in the region of the New England continental shelfbreak
… produce stronger coupling between the acoustic waveguide modes than expected. Arrival time wander and signal spread show variability attributable to the presence of a shelf water meander, changes in frontal configuration, and variability in the soliton field. The highly-coupled nature of the …
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Photosynthesis-inspired device architectures for organic photovoltaics
… generating layers via surface plasmon polariton modes in the interfacial thin silver contact and via radiation into waveguide modes. We experimentally demonstrate devices with both single layer antennas and strongly absorbing resonant cavity antennas. We measure energy transfer efficiency from …
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Evaluation of a planar optic waveguide as a platform for evanescent field chemical sensor development
A Ag$\sp+$-exchange planar optic waveguide was fabricated with the intent of taking advantage of the significant interfacial sensitivity of the device for evanescent field chemical sensor development in the visible spectral region. However, it was discovered that selective prism and grating …
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Integrated Photonic Functions Using Optically Anisotropic Materials
… field within photonics research in which waveguides and optical components can be fabricated as an planar, integrated structure. In particular, silicon photonics based on dielectric nanowires have been established as a platform of choice for processing optical signals largely due to their …
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Ultra-thin photovoltaic technologies with nanophotonic textures for enhanced solar energy harvesting
… concentrating on texture designs to exploit waveguide resonances as absorption enhancement mechanisms. For this purpose, I build a robust framework to study waveguide modes in ultra-thin devices with integrated textures. Based on this framework, comprehensive computational investigations …
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Probing Exciton Dynamics in Metal–Organic Frameworks
… MOF crystallites. A dipole orientation-dependent waveguide effect detected in bichromophoric MOF microplates reveals that excitons’ transition dipoles in MOFs can be inherently aligned with the reflecting surfaces of their surrounding microcavity, which enables potential control over excitons’ …
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Quantum dot polymer composite materials for light management in optoelectronic devices
… is absorbed in a luminophore, emitted into the waveguide modes of the polymer sheet, and directed to a photovoltaic cell where it is absorbed and converted to electricity. Since the area of the polymer sheet is greater than the area of the photovoltaic cell, concentration of the solar photon …
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Photonic engineering of near- and far-field radiative heat transfer
… formalism. For thin-film semiconductors, trapped waveguide modes are formed, which simultaneously enhance radiative transfer at high frequencies where these modes are resonant and suppress radiative transfer at low frequencies where no modes are supported. This spectrally selective behavior is …
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Near field coupling between elements of a finite planar array of circular apertures
The mutual admittance between two waveguide-fed apertures radiating into a multilayered region is expressed as a double integral of a combination of the Fourier transforms of the respective aperture electric fields and the solutions to a set of transformed wave equations for the layered region. The …
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Reproduction of auroral cyclotron emission mechanisms in laboratory experiments and 3D simulations
… excitation of the TE0,1 mode of a cylindrical waveguide at 4.42GHz and the TE₀,₃ mode at 11.7GHz, consistent with the 2D PiC code simulations. 3D simulations represent a significant extension to the previous work, as a two dimensional cylindrically symmetric simulation cannot account for …
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