Photoinduced Anisotropy and Polarization Holography in PMMA Doped with Disperse Orange 3
- Abstract
- The dynamics of photoisomerization was investigated in PMMA doped with Disperse Orange 3 (DO3) thin film. We derived an analytic absorption function to analyze the absorption change which was isotropically induced by circularly polarized light. The absorption curve measured by the pump-probe method followed an intensity dependent single exponential function. Based on this function, an analytic method for determining the photoisomerization parameters was demonstrated. The photoisomerization quantum yields for trans-cis and cis-trans processes were determined. This analytic method can be used to characterize the dynamics of photoisomerization in dye-doped thin films.
Photoinduced anisotropy was generated by irradiating the sample with linearly polarized wave. A series of analytic solutions was derived from the rate equations. It was used to analyze the dynamics of the anisotropic absorption. The anisotropic absorption was measured under irradiation with high and low pump beam intensities. The experimental results indicate that the isomerization plays a leading role at the early time evolution and the angular redistribution accumulates the trans isomers in the perpendicular direction as time goes on. The parameters in the equations were determined by fitting the experimental data during the buildup and decay of anisotropic absorption. This analysis method can be used to understand the dynamics of photoinduced anisotropy in dye-doped thin films.
The elliptic and linear polarization holographic gratings were formed by orthogonal linearly and circularly polarized waves, respectively. The polarization and diffraction efficiency of the diffracted waves were analyzed in the two recording configurations. In the first recording configuration of two orthogonal linearly polarized waves, it was verified that the diffracted waves replicate the polarization of the recording wave used during the recording and the experimental results followed the square of the 0 order and 1order Bessel function of the first kind. In the second recording configuration of two orthogonal circularly polarized recording waves with a left circularly polarized probe wave, the light energy was transferred to each other between the transmitted and diffracted waves followed the squared cosine function and squared sine function, respectively. The diffraction efficiency of the diffracted wave approached to 100%. Diffracted wave was observed only in the +1 order with right circular polarization.
- Issued Date
- 2018
- Awarded Date
- 2018. 8
- Type
- Dissertation
- Publisher
- 부경대학교
- Alternative Author(s)
- Yang Wu
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 물리학과
- Advisor
- 김선일
- Table Of Contents
- Abstract ⅸ
Chapter 1. Introduction 1
1.1 Research background 1
1.2 Summary of the contribution of this work 3
Chapter 2. Photoisomerization 6
2.1 Theory 6
2.1.1 Isomerization 6
2.1.2 Rate equation of the cis isomers 8
2.1.3 Absorption coefficient of the cis isomers 10
2.1.4 Analytic absorption function 14
2.2 Experiments 16
2.2.1 Sample fabrication (thin films) 16
2.2.2 Measurement of the sample thickness 16
2.2.3 Measurement of the beam size 18
2.2.4 Measurement of the absorption cross-section 22
2.2.5 Determination of the relaxation constant and quantum yields 27
2.3 Appendix: Visual Basic code (Single Channel) 34
Chapter 3. Photoinduced anisotropy 37
3.1 Theory 37
3.1.1 Rate Equations 37
3.1.2 Legendre polynomials expansion of orientational distribution 40
3.1.3 Equations of order parameters 45
3.1.4 Angular hole burning 52
3.1.5 Angular absorption distribution 54
3.2 Experiments 57
3.2.1 Early time evolution of absorption 58
3.2.2 Angular distribution of absorption at photostationary state 62
3.2.3 Anisotropic absorption behavior under irradiation 65
3.2.4 Relaxation of anisotropy 68
3.3 Appendix: Visual Basic code (Dual Channel) 72
Chapter 4. Polarization holography 75
4.1 Theory 75
4.1.1 Elliptic polarization holographic grating 76
4.1.2 Linear polarization holographic grating 82
4.2 Experiments 89
4.2.1 Sample fabrication (bulk polymer) 89
4.2.2 Experimental setup 90
4.2.3 Elliptic polarization holographic grating 91
4.2.4 Linear polarization holographic grating 95
Conclusions 101
References 103
Acknowledgements 111
- Degree
- Doctor
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