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Theoretical Characterization of the Nanoblade Optical Field Emission Cathode
Theoretical Characterization of the Nanoblade Optical Field Emission Cathode
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105148
- ISBN
- 9798293836451
- DDC
- 530
- 서명/저자
- Theoretical Characterization of the Nanoblade Optical Field Emission Cathode
- 발행사항
- [Sl] : University of California, Los Angeles, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 240 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Rosenzweig, James B.
- 학위논문주기
- Thesis (Ph.D.Physics.)--University of California, Los Angeles, 2025.
- 초록/해제
- 요약Optical field emission enhanced by nanostructure-induced focusing beyond the diffraction limit promises high-current, high-brightness electron beams. The nanoblade, an atomically sharp wedge with a metallic coating, has boasted enhanced fields up to 80 V/nm at a wavelength of 800 nm. Furthermore, the associated rescattering process produces high harmonic generation which may be of greater intensity than that of gas sources. In this thesis we aim to theoretically and computationally characterize the nanoblade cathode. In studying quasi-static field emission, we produce an effective source distribution applicable for any conductor, finding strong deviations from free-electron gas results for tungsten and copper-group (111) surfaces. We consider the near-field ponderomotive dynamics under the existence of a strong field gradient, finding modifications to existing classical rescattering cutoffs which will become of import particularly in high-wavelength ventures. In finding the limits of such a cathode, we perform a simple comparative thermomechanical study of tips and blades and find that structures with large opening angles perform better than their narrower counterparts. We explore the distribution of emitted radiation and consider the addition of gratings to improve high harmonic generation prospects. To estimate the emittance, brightness, and radiation yield, we develop an object-oriented time-dependent density-functional theory code, in C++ with a Python wrapper, which projects the grander system down to a single dimension. The following unprojection scheme permits the efficient estimation of these critical beam properties.
- 일반주제명
- Condensed matter physics
- 일반주제명
- Nanoscience
- 일반주제명
- Plasma physics
- 일반주제명
- Optics
- 키워드
- Brightness
- 키워드
- Cathode
- 키워드
- Field emission
- 키워드
- Nanostructure
- 키워드
- Ultrafast
- 기타저자
- University of California, Los Angeles Physics
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105148
■006m o d
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■020 ▼a9798293836451
■035 ▼a(MiAaPQ)AAI32241481
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aMann, Joshua Isaac.
■24510▼aTheoretical Characterization of the Nanoblade Optical Field Emission Cathode
■260 ▼a[Sl]▼bUniversity of California, Los Angeles▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a240 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Rosenzweig, James B.
■5021 ▼aThesis (Ph.D.Physics.)--University of California, Los Angeles, 2025.
■520 ▼aOptical field emission enhanced by nanostructure-induced focusing beyond the diffraction limit promises high-current, high-brightness electron beams. The nanoblade, an atomically sharp wedge with a metallic coating, has boasted enhanced fields up to 80 V/nm at a wavelength of 800 nm. Furthermore, the associated rescattering process produces high harmonic generation which may be of greater intensity than that of gas sources. In this thesis we aim to theoretically and computationally characterize the nanoblade cathode. In studying quasi-static field emission, we produce an effective source distribution applicable for any conductor, finding strong deviations from free-electron gas results for tungsten and copper-group (111) surfaces. We consider the near-field ponderomotive dynamics under the existence of a strong field gradient, finding modifications to existing classical rescattering cutoffs which will become of import particularly in high-wavelength ventures. In finding the limits of such a cathode, we perform a simple comparative thermomechanical study of tips and blades and find that structures with large opening angles perform better than their narrower counterparts. We explore the distribution of emitted radiation and consider the addition of gratings to improve high harmonic generation prospects. To estimate the emittance, brightness, and radiation yield, we develop an object-oriented time-dependent density-functional theory code, in C++ with a Python wrapper, which projects the grander system down to a single dimension. The following unprojection scheme permits the efficient estimation of these critical beam properties.
■590 ▼aSchool code: 0031.
■650 4▼aCondensed matter physics
■650 4▼aNanoscience
■650 4▼aPlasma physics
■650 4▼aOptics
■653 ▼aBrightness
■653 ▼aCathode
■653 ▼aField emission
■653 ▼aHigh harmonic generation
■653 ▼aNanostructure
■653 ▼aUltrafast
■690 ▼a0611
■690 ▼a0565
■690 ▼a0759
■690 ▼a0752
■71020▼aUniversity of California, Los Angeles▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0031
■791 ▼aPh.D.Physics.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359625▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
