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 14 of 14 for “"Transformation optics"”.
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Novel techniques for quasi three-dimensional nanofabrication of Transformation Optics devices
… 3D fabrication technique is the field of Transformation Optics. This field involves transforming and manipulating the optical space through which light propagates. Arbitrarily manipulating the optical space requires advanced fabrication techniques, which are not possible with current …
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Novel Metamaterial Blueprints and Elements for Electromagnetic Applications
… derive metamaterial devices has been denoted as `transformation optics' (TO). The first device proposed here consists of metamaterial blueprints of waveguide claddings for (waveguide) miniaturization. These claddings provide a precise control of mode distribution and frequency cut-off. The …
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Practical electron cloaking in solids
… strategy of designing "cloaks" is the so-called transformation optics, and the resulting continuous distribution of material properties, such as the refractive index for optical metamaterials, the effective mass and the potential profile for matter-wave metamaterials, requires the artificial …
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Advances in Complex Electromagnetic Media
… coordinates. This design process is termed `transformation optics' and has inspired the creation of many novel electromagnetic structures such as the invisibility cloak.</p><p>In this dissertation the tools used in the field of transformation optics will be explored and expanded. Several new …
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Engineering light-matter interaction using two dimensional materials
… of 2D materials and the development of transformation optics methods. I formulate a general semi-analytical framework for a system of discs, whereby emission and absorption properties of dark and bright plasmonic modes are studied, as a function of graphene doping. Furthermore, I employ …
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Electromagnetic waves in nonlinear and linear magnetooptic metamaterials
… of the thesis discusses thefascinating area of transformation optics and how this new field has developed recently.The way in which cloaking devices are implemented is described, and the possibility ofadding a magnetooptic switching functionality to the standard electromagnetic cloak …
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Nonlinear design in nanophotonics
… we present a new technique for the design of transformation optics devices based on large-scale optimization to achieve the optimal effective isotropic dielectric materials within prescribed index bounds. In addition to the optimization, a key point is the identification of the correct …
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Porous silicon as a platform for gradient refractive index photonics
… fields such as photonic crystals (PhCs) and transformation optics (TO) for applications including—but not limited to—light sources, imaging, optical communication, and solar energy conversion. This dissertation focuses on utilizing PSi as a platform for GRIN photonics. A modified …
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Design of Ultra-wideband Reflectors
… the first method, the reflector is designed as a Transformation Optics (TO) device and in the second method, the reflector is designed as a metasurface. The TO method amounts to manipulating of electromagnetic waves using an appropriate set of material parameters such that the wave propagation …
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Parity-time and supersymmetry in optics
… in this dissertation we show that optics can provide a fertile ground for studying, observing, and utilizing some of the peculiar symmetries that are currently out of reach in other areas of physics. In particular, in this work, we investigate two important classes of symmetries, …
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Acoustic metamaterial design and applications
… the object. However, the cloak designed by transformation optics usually calls for a highly anisotropic metamaterial, which make the experimental studies remain challenging. We present here the first practical realization of a low-loss and broadband acoustic cloak for underwater ultrasound. …
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Creation of 3-dimensional micro-optical materials
… photonic band gaps, negative refractive index, transformation optics, and sub-diffraction limit focusing, to name a few. These phenomena have great implications for our ability to control light, whether it is in its spectral emission and absorption, in directional control through waveguides, or …
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Topics in Electromagnetic, Acoustic, and Potential Scattering Theory
… and electromagnetic aspects for nano-technology, transformation optics, fiber optics, metamaterials with negative refractive indices, cloaking and invisibility, the topic of time-independent scattering theory in quantum mechanics is becoming a useful field to re-examine in the above contexts. One …
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Diffraction-based Optical Architectures for Processing One-dimensional Data
… reductions in the dimensionality of individual transformations that can feasibly be implemented at speed and at scale. Questions remain as to the extent to which diffractive photonic integrated chip (DPIC) architectures can be made to function well as intended at high operating frequencies, and …