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Compound Meta-optics for Complete Wavefront Control

dc.contributor.advisorValentine, Jason
dc.creatorZheng, Hanyu
dc.date.accessioned2023-05-17T20:49:12Z
dc.date.available2023-05-17T20:49:12Z
dc.date.created2023-05
dc.date.issued2023-03-10
dc.date.submittedMay 2023
dc.identifier.urihttp://hdl.handle.net/1803/18206
dc.description.abstractOptical metasurfaces, based on subwavelength structuring, offer a compact platform for manipulation of the amplitude, phase and polarization state of light. Independent control over these properties, however, is hindered by the limited engineering freedom associated with single-layer metasurfaces. In this dissertation, we utilize compound meta-optics to realize high-efficiency, independent, control over the amplitude, phase, and polarization state of light. High efficiency control is enabled by redistributing the wavefront between cascaded metasurfaces while end-to-end inverse design is used to realize independent complex-valued functions for orthogonal polarization states. Based on this platform, we demonstrate 3-dimensional holography, mode division multiplexing, optical mode conversion and universal vectorial holograms, all with diffraction efficiencies over 75%. We also demonstrate how compound meta-optics can serve as optical neural network accelerators that off-load computationally expensive convolution operations into high-speed and low-power optics. In this scenario, metasurfaces enable both spatial multiplexing and additional information channels, such as polarization, in object classification. End-to-end design is used to co-optimize the optical and digital systems resulting in a robust classifier that achieves 93.1% accurate classification of handwriting digits and 93.8% accuracy in classifying both the digit and its polarization state. This approach could enable compact, high-speed, and low-power image and information processing systems for a wide range of applications in machine-vision and artificial intelligence. Finally, this dissertation explores a prototyping platform based on self-assembled nanosphere lithography. As a result, a large-scale periodic metasurface is presented as a high-k filter for edge enhancements. In addition, grayscale lithography is used to realize nonperiodic large-scale metasurface devices including metalenses with diffraction-limited focusing and meta-holograms which could open new doors to cost effective and large-scale fabrication of a wide range of metasurface-based optics.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.subjectMetasurfaces, Machine Vision
dc.titleCompound Meta-optics for Complete Wavefront Control
dc.typeThesis
dc.date.updated2023-05-17T20:49:12Z
dc.type.materialtext
thesis.degree.namePhD
thesis.degree.levelDoctoral
thesis.degree.disciplineElectrical Engineering
thesis.degree.grantorVanderbilt University Graduate School
dc.creator.orcid0000-0003-1922-8112
dc.contributor.committeeChairValentine, Jason


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