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Polarization-Resolved Plasmon-Enhanced Single-Molecule Microscopy
Polarization-Resolved Plasmon-Enhanced Single-Molecule Microscopy
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153015
- ISBN
- 9798384045731
- DDC
- 620
- 서명/저자
- Polarization-Resolved Plasmon-Enhanced Single-Molecule Microscopy
- 발행사항
- [Sl] : University of Michigan, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 109 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Biteen, Julie.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2024.
- 초록/해제
- 요약Polarization-resolved microscopy adds a new control variable in single-molecule imaging and analysis, enabling the study of chiral light-matter interactions. I built the optics and experimental workflow to incorporate polarization control in the excitation and emission pathways of a wide-field epifluorescence microscope. I implemented the Jones formalism of optics and incorporated polarization optics elements. In this thesis, I present my workflow and the results of single-molecule and single-particle imaging under polarized plane-wave excitation.There were broadly two motivations for introducing polarization-resolved excitation: (1) To measure differential absorption of circularly polarized light at a single-particle and single-molecule level to uncover any heterogeneities that could be hidden in an ensemble measurement and, (2) To study the coupling of Au nanoantennas with circularly polarized light to understand the potential for plasmon-coupled fluorescence-detected circular dichroism of single molecules.After implementing polarization-resolved microscopy, I tested and disproved two proposed theories for unusual observations in the bulk measurement of Au nanorods mixed with insulin fibrils and thioflavin T, a dye that intercalates into the insulin fibrils.In addition to instrumentation that gives control over the polarization of the far-field electromagnetic field, I relied on numerical simulations to visualize the near-field electromagnetic field of the nanoantennas. The near-field of the antennas is changed drastically by changing the incident polarization. I also calculated the optical chirality, or the local twist of the field, to predict where absorption dissymmetry would be enhanced for chiral molecules. Simulations of the radiated power explain how the detected emission from linear emitters near chiral antennas is mis-handed: detected as circularly polarized instead of linearly polarized.Results from my single-molecule experiments using DNA-bound chiral fluorophores indicate that to compare the number and intensity of localizations, we need to first ensure that the adsorption characteristics are the same. The only significant indicator of molecular chirality was the increased detectability of right-handed J-dimers of Cy5 near achiral Au NP dimers under right circularly polarized illumination.
- 일반주제명
- Engineering
- 일반주제명
- Physical chemistry
- 일반주제명
- Optics
- 일반주제명
- Applied physics
- 키워드
- Plasmonics
- 키워드
- Photonics
- 기타저자
- University of Michigan Applied Physics
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017164545
■00520250211153015
■006m o d
■007cr#unu||||||||
■020 ▼a9798384045731
■035 ▼a(MiAaPQ)AAI31631513
■035 ▼a(MiAaPQ)umichrackham005803
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620
■1001 ▼aChattopadhyay, Saaj.
■24510▼aPolarization-Resolved Plasmon-Enhanced Single-Molecule Microscopy
■260 ▼a[Sl]▼bUniversity of Michigan▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a109 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Biteen, Julie.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2024.
■520 ▼aPolarization-resolved microscopy adds a new control variable in single-molecule imaging and analysis, enabling the study of chiral light-matter interactions. I built the optics and experimental workflow to incorporate polarization control in the excitation and emission pathways of a wide-field epifluorescence microscope. I implemented the Jones formalism of optics and incorporated polarization optics elements. In this thesis, I present my workflow and the results of single-molecule and single-particle imaging under polarized plane-wave excitation.There were broadly two motivations for introducing polarization-resolved excitation: (1) To measure differential absorption of circularly polarized light at a single-particle and single-molecule level to uncover any heterogeneities that could be hidden in an ensemble measurement and, (2) To study the coupling of Au nanoantennas with circularly polarized light to understand the potential for plasmon-coupled fluorescence-detected circular dichroism of single molecules.After implementing polarization-resolved microscopy, I tested and disproved two proposed theories for unusual observations in the bulk measurement of Au nanorods mixed with insulin fibrils and thioflavin T, a dye that intercalates into the insulin fibrils.In addition to instrumentation that gives control over the polarization of the far-field electromagnetic field, I relied on numerical simulations to visualize the near-field electromagnetic field of the nanoantennas. The near-field of the antennas is changed drastically by changing the incident polarization. I also calculated the optical chirality, or the local twist of the field, to predict where absorption dissymmetry would be enhanced for chiral molecules. Simulations of the radiated power explain how the detected emission from linear emitters near chiral antennas is mis-handed: detected as circularly polarized instead of linearly polarized.Results from my single-molecule experiments using DNA-bound chiral fluorophores indicate that to compare the number and intensity of localizations, we need to first ensure that the adsorption characteristics are the same. The only significant indicator of molecular chirality was the increased detectability of right-handed J-dimers of Cy5 near achiral Au NP dimers under right circularly polarized illumination.
■590 ▼aSchool code: 0127.
■650 4▼aEngineering
■650 4▼aPhysical chemistry
■650 4▼aOptics
■650 4▼aApplied physics
■653 ▼aPlasmonics
■653 ▼aSingle-molecule fluorescence imaging
■653 ▼aPhotonics
■653 ▼aPolarization optics
■653 ▼aOptical chirality
■690 ▼a0752
■690 ▼a0494
■690 ▼a0537
■690 ▼a0215
■71020▼aUniversity of Michigan▼bApplied Physics.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164545▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


