TitleDispersion of silicon based micro-and nano-photonic structures and its device applications
NameInteglia, Ryan Anthony (author), Jiang, Wei (chair), Lu, Yicheng (internal member), Caggiano, Michael (internal member), Soboyejo, Wole (outside member), Rutgers University, Graduate School - New Brunswick,
SubjectElectrical and Computer Engineering,
Optical rotatory dispersion
DescriptionSignificant dispersion can occur in silicon micro- and nano-photonic structures, such as photonic crystals and microresonators. These dispersions may cause the phase shift and group velocity of light to be highly wavelength dependent along a fixed propagation path, or cause the propagation direction of light to be highly sensitive to the wavelength. These two types of effects are called longitudinal dispersion and angular dispersion, respectively. The slow-light effect is due to the longitudinal dispersion, and the angular dispersion is associated with the superprism effect in photonic crystals. Though, longitudinal dispersion has a less apparent influence on the superprism effect, as revealed through a more in-depth analysis. A synergistic theoretical framework of the dispersions is developed to enable a common examination of the longitudinal and angular dispersion in photonic crystal structures. These dispersive effects can lead to undesirable consequences, such as large losses and/or narrow bandwidths. For the slow-light effect, a basic proof will be shown for the scaling of random scattering losses due to fabrication imperfections in a photonic crystal waveguide. For the superprism effect, a fundamental limit, the bandwidth-sensitivity product, will be presented that governs the maximum angular sensitivities and the achievable bandwidth. This product is the counterpart of the bandwidth-delay product for the slow-light effect. A parallel-coupled dual racetrack silicon resonator structure is proposed and analyzed for arbitrary quadrature signal generation. The over-coupled, critically-coupled, and under-coupled scenarios are systematically studied. Simulations indicate that only the over-coupled structures can generate arbitrary quadrature signals. The effects of potential asymmetries in the coupling constants and quality factors of the two racetrack resonators are systematically studied. It is shown that these asymmetry effects can be compensated by small phase shifts in the two racetracks. The design, fabrication and characterization of silicon waveguides, resonator and periodic structures, including the parallel-coupled dual racetrack structure, will also be presented. The results have shown successful coupling of resonators. With the high dispersion of silicon micro- and nano-photonic structures, light can be modulated, switched, and steered with higher efficiency and lower power consumption. Thus this study may contribute to saving energy in photonic devices.
NoteIncludes bibliographical references
Noteby Ryan Anthony Integlia
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.