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 22 for “"Slow Light"”.
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Trapped-modes, slow light and collective resonances in metamaterials
A new class of metamaterials exhibiting coherent, collective response has been introduced. It is shown that the sharp resonant behaviour of coherent metamaterials can only be observed in arrays of metamaterial elements and is absent from the response of a single isolated unit cell. As a result, …
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Characteristics of defect modes, slow light, and disorder in photonic crystals
… the modal group velocity to zero, which causes slow-light magnification of the field intensity at constant power input.
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Slow Light Based on Quantum Effects in Quantum Wells and Quantum Dots
This is a detailed study of slow light based on quantum effects in semiconductor nanostructures. We propose to implement an optical buffer using semiconductor quantum dots and quantum wells based on coherent population oscillation and spin related electromagnetically induced transparency. We …
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Plasmonic devices for manipulating light at the nanoscale: slow-light waveguides and compact couplers
… structures and devices for manipulating light at the nanoscale: slow-light waveguides and compact couplers. I first introduce a plasmonic waveguide system, based on a plasmonic analogue of electromagnetically induced transparency (EIT), which supports a subwavelength slow-light mode, and …
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Non-linear optical properties of semiconductor nano-structures for slow light and wavelength conversion
… look at using a cavity mode for the purpose of slow- and fast-light and theoretically demonstrate that a fast- to slow-light transition occurs at the lasing threshold. These results compare well with previous measurements, and we present our own experimental investigations utilizing both a …
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Brillouin scattering induced transparency: Coherent optomechanical interaction leading to slow light and non-reciprocal light transmission
… isolator is a device that allows only one-way light transmission. It is an essential optical component used for protection of laser sources found in many applications such as undersea optical communication networks, spectroscopy, fluorescence microscopy, and laser cutting. Today, all optical …
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Precision Tuning of Silicon Nanophotonic Devices through Post-Fabrication Processes
… numerous optical resonator designs as well as slow-light waveguides. Optical resonators are used to confine photons both spatially and temporally. In recent years, there has been much research, both theoretical and experimental, into improving the design of optical resonators. Improving these …
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Slow and Fast Light Using Quantum-Dot and Quantum-Well Semiconductor Optical Amplifiers
Controlling the group velocity of light has great potential applications in future optical communication, photonic computing, and microwave signal processing. These applications have recently triggered immense experimental and theoretical interest in the research community. Numerous studies report …
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Nonlinear Photonics in Waveguides for Telecommunications
… of comparable temporal lengths is presented. The slow light effect was observed in 1-meter of i-LCOF, where 18 ps pulses were delayed up to 34 ps through the use of stimulated Raman scattering. Delays greater than a pulse width indicate a potential application as an ultrafast controllable delay …
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Stimulated Brillouin scattering in an on-chip microdisk resonator
Brillouin scattering is the scattering of light from sound waves in a medium. There are three waves involved in the process: two optical waves (pump and scattered light) and one acoustic wave, and the scattering process is restricted through the conservation of momentum and energy. Stimulated …
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Exploring the edge of electromagnetism using extreme fields
… theories are studied in the context of possible slow light experiments. Maximum amplitude plasma waves are considered as a possible testing ground for nonlinear electrodynamics with regards to electron energy gain. Finally the eects of the coupling between the electromagnetic eld and the spin of …
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COMPLETE TEMPORAL MEASUREMENT OF LOW-INTENSITY AND HIGH-FREQUENCY ULTRASHORT LASER PULSES
… recent development of bright, coherent light sources in this wavelength range. The challenge in measuring weak pulses in the NIR is that many measurement techniques require expensive electronics and/or are complicated and difficult to align. UV pulse measurement on the other hand, due to …
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Comparative Study of Forward and Diffusely Scattered Light in a Coherently Prepared Ultracold Rubidium Gas
… between forward and diffusely scattered light propagating in a coherently prepared ultracold <sup>87</sup>Rb atomic vapor is presented. This research is part of the ongoing effort to characterize the processes, such as diffusion, that contribute to coherence loss in atomic media under …
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Chip-scale Photonic Devices for Light-matter Interactions and Quantum Information Processing
… as microdisks, photonic crystal cavities and slow-light photonic crystal waveguides possess strong light localization and long photon lifetime, which will significantly enhance the light-matter interactions and can be used to implement new functionalities for both classical and quantum …
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On-chip single photon sources based on quantum dots in photonic crystal structures
… is the monolithic integration of quantum light sources with the photonic circuit on a single chip. This dissertation presents the experimental demonstration of different in-plane single photon sources that allow for this integration with planar light circuits. To this end, the spontaneous …
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Computation & design for nanophotonics
… development of adiabatic tapers for coupling to slow-light modes of photonic-crystal waveguides that are insensitive to manufacturing and operational variability.
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Studies of advanced integrated nano-photonic devices in silicon
… telecom-grade specifications, and a dynamical slow light cell for delay lines and optical memory elements. All the devices demonstrated in this thesis can be integrated on the same chip. The small device footprints and the use of the SOI platform are ideal for integration with a standard CMOS …
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Nanophotonics for tailoring light-matter interaction/
… nanophotonics phenomena which enable strong light-matter interaction. The first phenomenon is plasmonic resonance, where the surface plasmon mode at metal and dielectric boundaries significantly enhances the optical response of nanoparticles. We propose an optimization-based theoretical …
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Numerical modeling of nonlinear mode interaction in semiconductor lasers and amplifiers to generate slow/fast light
… or amplifier is one of the techniques to obtain slow light (ng >> 1), fast light (-1 < ng < 1), phase conjugated reflection (also known as backward light (ng < 0)) and supercontinuum emission (also known as critically anomalous dispersion (ng = 0)), where ng is the group index. In the nonlinear …
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Slow and fast light by spectral hole-burning in the solid state
The generation of slow (subliminal) and fast (superluminal) light has attracted a great deal of attention over recent years because of potential applications in optical data storage, optical switching, quantum data processing and pulse regeneration. Slow and fast light can be achieved in materials …
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