Unconventional nanophotonic thermal emitters for imaging and energy applications

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dc.contributor.advisorNaik, Gururaj Ven_US
dc.creatorPrasad, Ciril Samuelen_US
dc.date.accessioned2024-08-30T18:26:47Zen_US
dc.date.created2024-08en_US
dc.date.issued2024-08-05en_US
dc.date.submittedAugust 2024en_US
dc.date.updated2024-08-30T18:26:48Zen_US
dc.descriptionEMBARGO NOTE: This item is embargoed until 2025-02-01en_US
dc.description.abstractAll objects above absolute zero temperature emit thermal radiation. Seamless control over this thermal radiation can unlock solutions to fundamental and technological challenges in imaging, energy harvesting, and utilization. Existing thermal emitter designs are limited by various trade-offs involving spectral selectivity, brightness, and directionality of thermal radiation. In this thesis, I demonstrate unconventional ways to achieve spectral and spatial control over thermal radiation by engineering complex permittivity of the emitter surface. First, using the principles of non-Hermitian physics, a hybrid plasmonic-photonic coupled resonator metasurface is designed and experimentally verified to exhibit strong spectral selectivity at elevated temperatures. I demonstrate that the designed selective thermal emitter on a refractory metal platform surpasses the spectral efficiency limit set by existing thermal emitter designs used in thermophotovoltaics--a solid-state scheme to convert heat into electricity. A transparent, asymmetrically emitting thermal metasurface is realized based on similar concepts. The designed metasurface enhanced the image contrast while performing thermal imaging in high-temperature environments. Further, the k-space of metasurface is explored, revealing additional tunable parameters for engineering thermal radiation. Finally, a way to achieve broadband IR emission/absorption is proposed and demonstrated using aligned carbon nanotube films with anisotropic permittivity tensor.en_US
dc.embargo.lift2025-02-01en_US
dc.embargo.terms2025-02-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationPrasad, Ciril Samuel. Unconventional nanophotonic thermal emitters for imaging and energy applications. (2024). PhD diss., Rice University. https://hdl.handle.net/1911/117819en_US
dc.identifier.urihttps://hdl.handle.net/1911/117819en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectNanophotonicsen_US
dc.subjectThermal emittersen_US
dc.subjectNon-Hermitian opticsen_US
dc.subjectThermophotovoltaicsen_US
dc.subjectThermal imagingen_US
dc.titleUnconventional nanophotonic thermal emitters for imaging and energy applicationsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentApplied Physicsen_US
thesis.degree.disciplineApplied Physics/Electrical Engen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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