Subwavelength and nonreciprocal optical and electromagnetic systems for sensing and communications

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dc.contributor.advisorWang, Zheng, Ph. D.
dc.contributor.committeeMemberAlù, Andrea
dc.contributor.committeeMemberBank, Seth R
dc.contributor.committeeMemberWang, Yaguo
dc.contributor.committeeMemberYu, Edward T
dc.creatorWilliamson, Ian Alexander Durant
dc.creator.orcid0000-0002-6699-1973
dc.date.accessioned2019-09-25T20:36:31Z
dc.date.available2019-09-25T20:36:31Z
dc.date.created2017-08
dc.date.issued2017-06-07
dc.date.submittedAugust 2017
dc.date.updated2019-09-25T20:36:32Z
dc.description.abstractThis dissertation is organized into three parts. First, the design for a radio frequency fiber transmission line built out of a grid of micrometer-scale conductors embedded in an insulating polymer cladding is presented to mitigate the skin and proximity effects. By adopting a checkerboard out-of-phase current phasing scheme, the internal inductance of the line is significantly lower than in two-conductor lines and results in an LC bandwidth of approximately 2 GHz, with flat attenuation and linear phase dispersion. The device performance is characterized in terms of its geometric degrees of freedom and a fabricated prototype is presented. Second, the kinetic inductive and plasmonic response of monolayer graphene in the terahertz spectrum is examined in the context of several important applications. The dispersive responses of two-dimensional graphene and three-dimensional copper transmission lines are compared to map the dispersive signaling performance in terms of transmission line cross-sectional size. This demonstrates a surprisingly broadband LC response with flat attenuation in nano-scale lines. This kinetic inductive response of graphene is demonstrated to miniaturize the photonic band structure of a photonic crystal slab where an in-plane periodicity of 300 nm has its photonic band gap in the terahertz spectrum. The sub-diffraction photonic band structure resembles that of the two-dimensional photonic crystal, supporting a wide photonic band gap in extremely thin slabs. The viability of graphene for cavity optomechanics is analyzed from near infrared to terahertz wavelengths, demonstrating a large optomechanical coupling, on the order of 3D optomechanical materials. Third, a class of nonreciprocal devices is proposed based on coupling to the sideband states, called Floquet resonances, that arise in temporally modulated optical resonators. The degrees of freedom in the modulating waveform tailor the energy exchange and phase of the Floquet resonances to realize unique nonreciprocal spectral responses in compact devices. We examine optical scattering from Floquet resonators coupled to narrowband waveguides using temporal coupled-mode theory. A three-port circulator is built out of a cascade of Floquet resonators to demonstrate broadband forward transmission and ideal isolation for dual-carrier waves. Full-wave numerical simulations in the coupled frequency domain demonstrate the circulator in an on-chip photonic crystal platform
dc.description.departmentElectrical and Computer Engineering
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/2152/76012
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/3111
dc.language.isoen
dc.subjectRadio frequency
dc.subjectMicrowave
dc.subjectTerahertz
dc.subjectThz
dc.subjectInfrared
dc.subjectOptical
dc.subjectOptics
dc.subjectCommunications
dc.subjectSensing
dc.subjectPolycarbonate
dc.subjectGraphene transmission lines
dc.subjectPhotonic crystals
dc.subjectKinetic inductance
dc.subjectPlasmonics
dc.subjectOptomechanics
dc.subjectNonreciprocal
dc.subjectFloquet
dc.subjectModulation
dc.subjectTime-modulation
dc.titleSubwavelength and nonreciprocal optical and electromagnetic systems for sensing and communications
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.disciplineElectrical and Computer Engineering
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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