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Dynamic Wavefront Manipulation Using Reconfigurable Resonant Semiconductor Metasurfaces: From Design Concepts to Functional Devices
Dynamic Wavefront Manipulation Using Reconfigurable Resonant Semiconductor Metasurfaces: From Design Concepts to Functional Devices
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151509
- ISBN
- 9798384047551
- DDC
- 535
- 서명/저자
- Dynamic Wavefront Manipulation Using Reconfigurable Resonant Semiconductor Metasurfaces: From Design Concepts to Functional Devices
- 발행사항
- [Sl] : Cornell University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 179 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Shvets, Gennady.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2024.
- 초록/해제
- 요약For many contemporary photonic technologies, ranging from mobile cameras, to light detection and ranging (LiDAR) and mixed-reality displays, wavefront shaping elements (e.g. lenses and waveplates) that are compact and tunable have become increasingly important. Recently, optical metasurfaces composed of judiciously-engineered nanostructures have provided an ultrathin and lightweight platform for modulating electromagnetic fields. All-dielectric metasurfaces have enabled high-performance optically-thin waveplates, beam steerers, and lenses, by virtue of precisely engineered resonant modes and low nonradiative losses. However, most metasurfaces have fixed functionalities after fabrication, restricting their potential practical applications.In this thesis, I develop several reconfigurable all-dielectric metasurfaces that act as ultrathin tunable optical modulators. Each proposed metasurface consists of arrays of silicon or germanium nanobars, engineered to support resonances sensitive to temperature or electric fields. In the first part of this thesis, Chapter 2 presents a germanium metasurface that acts as a thermally-actuated polarization converter. Its successful implementation relies on an anisotropic metasurface design that facilitates the thermo-optic tuning of a sharply-resonant spectral mode. By manipulating the temperature-dependent phase retardance between the two principal linear polarization states, a wide range of output polarization states are generated and controlled. In the next application, Chapters 3 and 4, I describe how metasurfaces can be merged with a well-studied electro-optic technology - liquid crystals (LCs) - to create a new class of voltage-controlled varifocal metalenses. The design exploits the electro-optic properties of LCs to tailor the local phase response of individual nanostructures, resulting in real-time modulations to the metalens focal length. Finally, in Chapter 5 I introduce a new type of simplified multi-color flat lens that reuses a small number of nanostructure types regardless of lens diameter. The proposed architecture may find future use in minimizing the computation cost and fabrication complexity of tunable multicolor metalenses. In full, by detailing the numerical optimization and experimental demonstration of several active metasurface platforms and showcasing their utility as tunable polarization converters and multifunctional focusing elements, this thesis opens new avenues for achieving ultracompact dynamic optical modulators for use in free space and integrated photonics.
- 일반주제명
- Optics
- 일반주제명
- Nanotechnology
- 일반주제명
- Engineering
- 키워드
- Metamaterials
- 키워드
- Photonics
- 키워드
- Liquid crystals
- 기타저자
- Cornell University Physics
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017161976
■00520250211151509
■006m o d
■007cr#unu||||||||
■020 ▼a9798384047551
■035 ▼a(MiAaPQ)AAI31299569
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a535
■1001 ▼aBosch, Melissa Josephine.▼0(orcid)0009-0009-2296-2749
■24510▼aDynamic Wavefront Manipulation Using Reconfigurable Resonant Semiconductor Metasurfaces: From Design Concepts to Functional Devices
■260 ▼a[Sl]▼bCornell University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a179 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Shvets, Gennady.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2024.
■520 ▼aFor many contemporary photonic technologies, ranging from mobile cameras, to light detection and ranging (LiDAR) and mixed-reality displays, wavefront shaping elements (e.g. lenses and waveplates) that are compact and tunable have become increasingly important. Recently, optical metasurfaces composed of judiciously-engineered nanostructures have provided an ultrathin and lightweight platform for modulating electromagnetic fields. All-dielectric metasurfaces have enabled high-performance optically-thin waveplates, beam steerers, and lenses, by virtue of precisely engineered resonant modes and low nonradiative losses. However, most metasurfaces have fixed functionalities after fabrication, restricting their potential practical applications.In this thesis, I develop several reconfigurable all-dielectric metasurfaces that act as ultrathin tunable optical modulators. Each proposed metasurface consists of arrays of silicon or germanium nanobars, engineered to support resonances sensitive to temperature or electric fields. In the first part of this thesis, Chapter 2 presents a germanium metasurface that acts as a thermally-actuated polarization converter. Its successful implementation relies on an anisotropic metasurface design that facilitates the thermo-optic tuning of a sharply-resonant spectral mode. By manipulating the temperature-dependent phase retardance between the two principal linear polarization states, a wide range of output polarization states are generated and controlled. In the next application, Chapters 3 and 4, I describe how metasurfaces can be merged with a well-studied electro-optic technology - liquid crystals (LCs) - to create a new class of voltage-controlled varifocal metalenses. The design exploits the electro-optic properties of LCs to tailor the local phase response of individual nanostructures, resulting in real-time modulations to the metalens focal length. Finally, in Chapter 5 I introduce a new type of simplified multi-color flat lens that reuses a small number of nanostructure types regardless of lens diameter. The proposed architecture may find future use in minimizing the computation cost and fabrication complexity of tunable multicolor metalenses. In full, by detailing the numerical optimization and experimental demonstration of several active metasurface platforms and showcasing their utility as tunable polarization converters and multifunctional focusing elements, this thesis opens new avenues for achieving ultracompact dynamic optical modulators for use in free space and integrated photonics.
■590 ▼aSchool code: 0058.
■650 4▼aOptics
■650 4▼aNanotechnology
■650 4▼aEngineering
■653 ▼aMetamaterials
■653 ▼aPhotonics
■653 ▼aWavefront shaping elements
■653 ▼aLiquid crystals
■690 ▼a0752
■690 ▼a0652
■690 ▼a0537
■71020▼aCornell University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161976▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
