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Infrared and Terahertz Near-field Spectroscopy and Microscopy on 3d and 4d Correlated Electron Materials
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Infrared and Terahertz Near-field Spectroscopy and Microscopy on 3d and 4d Correlated Electron Materials. |
| 개인저자 | Zhang, Jiawei. |
| 단체저자명 | State University of New York at Stony Brook. Physics. |
| 발행사항 | [S.l.]: State University of New York at Stony Brook., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 105 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-05B. Dissertation Abstract International |
| ISBN | 9781687931672 |
| 학위논문주기 | Thesis (Ph.D.)--State University of New York at Stony Brook, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
Advisor: Liu, Mengkun. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | The electromagnetic waves in the far infrared and terahertz range have ubiquitous applications to the optical characterization of solid-state materials in which numerous physical phenomena occur within the energy range below ~ 100 meV ( molecular rotation, exciton transition, superconducting gap opening, etc.). Conventional infrared and terahertz characterization methods have been suffering from low spatial resolution due to optical diffraction effects. This thesis presents a new type of micro-imaging technique named scattering-type scanning near-field optical microscopy (s-SNOM) which can reach deep subwavelength spatial resolution regardless of the wavelength of probing light. The working principle of far infrared s-SNOM is introduced with an illustration of two experimental measurements on the insulator-to-metal phase transition (IMT) of transition metal oxides Ca2RuO4 and VO2, the images of phase boundaries on sample surfaces show exotic nanoscale phase patterns, revealing the competition between strain and domain wall energy, showing the complex interplay between non-equilibrium electronic and lattice steady states. The second part of the thesis discusses the terahertz time domain spectroscopy (THz-TDS) and optical-pump-terahertz-probe (OPTP) schemes. An experiment is demonstrated to explore the ultrafast electronic dynamics of correlated electron materials V1-xNbxO2 thin films, revealing a novel way of tuning electron-electron and electron-phonon interaction dynamics. The last part of the thesis reports our recent progress in THz s-SNOM with a demonstration of near field imaging on graphene. Measurement suggests that a single layer graphene acts as a perfect terahertz reflector in the near-field regime due to high-momentum effects. Conclusions and potential works for the future are mentioned at last. |
| 일반주제명 | Physics. |
| 언어 | 영어 |
| 바로가기 | 
: 이 자료의 원문은 한국교육학술정보원에서 제공합니다. |
