DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Shin, Sung-Chul | - |
dc.contributor.advisor | 신성철 | - |
dc.contributor.author | Jeong, Jae-Woo | - |
dc.contributor.author | 정재우 | - |
dc.date.accessioned | 2011-12-14T07:27:45Z | - |
dc.date.available | 2011-12-14T07:27:45Z | - |
dc.date.issued | 2005 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=245026&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/47589 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 물리학과, 2005.2, [ v, 76 p. ] | - |
dc.description.abstract | The Nonlinear optical methods are widely used for the investigation of real solids, and are usually more powerful than linear optical methods. Among nonlinear optical phenomena second-harmonic generation (SHG) is very efficient for an investigation of thin films and interfaces. The SHG signal is very sensitive to a change of symmetry induced by various physical actions--for example, by strain. Special kinds of internal strain lead to a lowering of the symmetry of a crystal, i.e., to a missing of the inversion center. As a result, bulk dipole active optical SHG should be observed for transparent materials in the transmission geometry. From another side, surfaces and interfaces of centrosymmetric bulk materials are characterized by a lower point-symmetry group even in the absence of strain. In this case a more effective method to observe strain-induced changes of a surface is the measurement of optical SHG in the reflection geometry. In both cases, a method using three-photon phenomena is an effective tool for investigating strain-induced effects in solids and solid-state structures. For development of strain-induced SHG as an applicable method for investigation, both theoretical and experimental approach have been made in this thesis. Strain-induced three-photon effects such as SHG and hyper-Rayleigh light scattering, characterized by electromagnetic radiation at the double frequency of an incident light, are phenomenologically investigated by adopting a nonlinear photoelastic interaction. The relations between the strain and the nonlinear optical susceptibility for crystal surfaces with point symmetries of 4mm and 3m are described by a symmetry analysis of the nonlinear photoelastic tensor. We theoretically demonstrate a possibility of determining the strain components by measuring the rotational anisotropy of radiation at the second harmonic frequency. Hyper-Rayleigh light scattering by dislocation strain is also described using a nonlinear photoelastic tenso... | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Second Harmonic Generation | - |
dc.subject | 이차 조화파 | - |
dc.title | Strain-induced second harmonic generation in ultrathin films | - |
dc.title.alternative | 스트레인에 의한 이차 조화파 발생에 관한 연구 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 245026/325007 | - |
dc.description.department | 한국과학기술원 : 물리학과, | - |
dc.identifier.uid | 000995343 | - |
dc.contributor.localauthor | Jeong, Jae-Woo | - |
dc.contributor.localauthor | 정재우 | - |
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