본문 바로가기 주메뉴 바로가기
22대 대한민국 국회 국회정보길라잡이 국회의원검색
회원가입 로그인
HOME

정보검색

소장정보 검색

국회도서관 홈으로 정보검색 소장정보 검색
결과 내 검색 동의어 포함
결과 내 검색 동의어 포함

-

목차보기

Title Page 1

초록 4

Abstract 4

Contents 5

Chapter 1. Introduction 9

1.1. Research Background 9

1.1.1. Symmetry in nature 9

1.1.2. Spontaneous symmetry breaking 9

1.2. Research Objective 11

1.3. Bibliography 13

Chapter 2. Periodic arrays of chiral domains generated from the self-assembly of micropatterned achiral lyotropic chromonic liquid crystal 15

2.1. Introduction 15

2.2. Results and discussion 16

2.2.1. Generation of periodic chiral domains using surface anchoring anisotropy 16

2.2.2. Interaction between chiral domains 18

2.2.3. Control of chiral domains with confinement variation 20

2.2.4. Control of chiral domains with chemical additives 21

2.3. Conclusion 21

2.4. Experimental process 22

2.4.1. Sample preparation and characterization 22

2.4.2. Numerical simulation 22

2.5. Bibliography 23

Chapter 3. Fabrication of Arrays of Topological Solitons in Patterned Chiral Liquid Crystals for Real-Time Observation of Morphogenesis 26

3.1. Introduction 26

3.2. Results and discussion 26

3.3. Conclusion 39

3.4. Experimental process 40

3.4.1. Sample preparation and characterization 40

3.4.2. Landau-de Gennes modeling of the chiral liquid crystal 40

3.4.3. Simulation of polarizing optical microscopy images 42

3.4.4. Simulation of time-dependent heat transfer 42

3.4.5. Statistical analysis 42

3.5. Bibliography 42

Chapter 4. Planar spin glass with topologically-protected mazes in the liquid crystal targeting for reconfigurable micro security media 45

4.1. Introduction 45

4.2. Results and discussion 47

4.2.1. Fabrication of the topologically-protected maze 47

4.2.2. Deterministic optical properties of the topologically-protected maze 49

4.2.3. Non-deterministic properties of the topologically-protected maze 51

4.2.4. Reconfiguration of the topologically-protected maze 55

4.2.5. Multi-factor security system with the topologically-protected maze 56

4.3. Conclusion 60

4.4. Experimental process 61

4.4.1. Materials 61

4.4.2. Sample preparation and characterization 61

4.4.3. Digitalization process of CF-3 maze 62

4.4.4. Calculation of PUF statistical value 63

4.4.5. Resolution test 64

4.4.6. Generation of 2D binary random patterns with Monte Carlo simulation of two-dimensional Ising model 64

4.4.7. Fabrication of 2D ferromagnetic and antiferromagnetic patterns with the nematic LCs 65

4.4.8. Numerical simulation of the director fields for topological defects to generate the ferromagnetic pattern 66

4.4.9. Fluorescent dye and reactive mesogen are simultaneously doped Topologically-protected mazes 66

4.5. Bibliography 67

Curriculum Vitae 72

List of Figures 7

Figure 1.1. Various examples of symmetries found in nature 9

Figure 1.2. Various schematic illustrations and illustration for spontaneous mirror symmetry breaking (SSB). (a)... 10

Figure 1.3. Schematic illustrations for the liquid crystal (LC) phase. Polarized optical microscope images for the... 11

Figure 1.4. SSB phenomena in the LCs. POM images for the (a) uniaxially aligned LC along a red arrow and (b)... 12

Figure 2.1. Substrate patterns and the resulting nematic textures. (a) Schematic illustration of a patterned silicon... 16

Figure 2.2. Chiral domain formation between the air pillars. (a and b) POM images (without and with the λ... 18

Figure 2.3. Symmetry-breaking variation with interpillar spacing. (a-d) The deflection angles of the vertical... 20

Figure 2.4. Control of the racemic domain handedness with the addition of chiral dopants. (a-c) POM images... 21

Figure 3.1. Patterned substrates and enabled highly ordered solitonic structures. (a) Schematic illustrations of... 27

Figure 3.2. Measured cholesteric pitch (p) of the Ch LC versus temperature. The pitch is measured with the... 28

Figure 3.3. Nucleation of torons from topological defects. (a-h) Experimental images of sequential phase... 29

Figure 3.4. Simulation of time-dependent heat transfer. (a, b) Color maps represent one-time point when 5CB is... 30

Figure 3.5. (a-h) Optical microscope images with a polarizer corresponding to Figure 3.3. (i) An out-of-focus... 30

Figure 3.6. Fluorescent confocal microscope (FCM) image of air pillar. (a-c) FCM images of the xy-plane of the... 31

Figure 3.7. Experimental images obtained by POM with a retardation plate of (a) intermediate and (c) stabilized... 31

Figure 3.8. Transformation of cholesteric fingers mediated by topological defects. (a-h) Experimental images of... 33

Figure 3.9. Transformation of CFs. (a-h) Optical microscope images with a polarizer corresponding to Figure... 34

Figure 3.10. POM images of torons and CFs for various lattice spacings. (a-d) Experimental POM images of the... 35

Figure 3.11. Time-dependent thermal gradient according to the spacing (sp) between the air pockets. (a)... 35

Figure 3.12. Transformation of torons and CFs for various d/p and sp. (a-d) POM images with a 530nm... 36

Figure 3.13. A graph for distances between torons according to the spacing (sp) between the air pockets. As sp... 37

Figure 3.14. Computer-simulated images and three-dimensional structures of CF-3s for various sp. As sp... 37

Figure 3.15. Eight distinct types of Ch structures versus d/p and sp between air pockets. In the diagram, the eight... 38

Figure 3.16. Transformation of the Ch structures according to various d/p and sp. (a-c) POM images with a 530... 39

Figure 4.1. Overview of reconfigurable micro security media with the liquid crystals 46

Figure 4.2. POM images of the sequential thermal phase transition of the cholesteric LCs 47

Figure 4.3. A POM image of the topologically-protected maze 48

Figure 4.4. Anisotropic optical property of the cholesteric finger 49

Figure 4.5. Computer simulated refractive indices of topologically-protected maze in the xz-plane 50

Figure 4.6. Non-deterministic properties of the topologically-protected maze 51

Figure 4.7. Flowchart of the digitalization process of the topologically-protected maze using machine learning-... 52

Figure 4.8. inter-HD histograms obtained with 1D binary matrices composed of 16 bits. The 1D binary matrices... 52

Figure 4.9. Evaluation of reliability for detecting the maze according to image resolution 53

Figure 4.10. Schematic illustrations of 2D random patterns with Monte Carlo simulation of the Ising model 54

Figure 4.11. Challenge-response pairs 54

Figure 4.12. Reconfiguration of the topologically-protected maze with the thermal phase transition 55

Figure 4.13. Various elements for additional security primitives that enable a multi-factor security system 57

Figure 4.14. Ferromagnetic patterns with topologically-protected structures 58

Figure 4.15. Antiferromagnetic patterns with topologically-protected structures 58

Figure 4.16. Temperature-dependent fluorescent anisotropy of the topologically-protected mazes when... 59

초록보기

 자연에서 관측되는 기본적인 현상 중 하나인 자발적 대칭성 깨짐은 아원자 입자에서부터 초기 우주까지 다양한 크기 체계에서 발생합니다. 이러한 현상을 이해하는 것은 기본 물리 현상에 대한 근본적 이해를 이끌어 낼 수 있기 때문에 중요합니다. 또한, 양자 컴퓨팅, 아원자 입자를 기반으로 한 새로운 에너지원 개발, 새로운 재료 개발 등의 차세대 기술 발전에도 기여할 수 있습니다. 그러나 이 현상들은 실험적으로 분석하기에는 시스템의 크기가 너무 작거나 너무 큰 경우가 많습니다. 따라서 제어된 환경에서 이러한 현상들을 정확하게 재현할 수 있는 중간 규모 모델 시스템을 도입하는 것이 필요합니다. 이 논문에서는 액정상 물질을 이용하여 자연에서 발생하는 자발적 대칭성 깨짐 현상의 모사체를 제안하였습니다. 우리는 액정상 물질로 마이크로미터 스케일에서 다양한 대칭 파괴 패턴을 제작하고, 이러한 패턴을 연구하여 자발적 대칭성 깨짐의 근본적인 메커니즘을 깊이 이해했습니다. 또한, 이러한 패턴에서 발생하는 광 신호를 이용한 다양한 실용적 응용을 제시했습니다.

추천서가 (다양한 추천 자료를 만나보세요)

권호기사보기

권호기사 목록 테이블로 기사명, 저자명, 페이지, 원문, 기사목차 순으로 되어있습니다.
기사명 저자명 페이지 원문 기사목차