Photorefractive polymer composites for holographic optical coherence imaging:
Gespeichert in:
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| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
2009
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| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | III, 286 S. Ill., graph. Darst. 21 cm |
Internformat
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Datensatz im Suchindex
| _version_ | 1804141017981517824 |
|---|---|
| adam_text | Titel: Photorefractive polymer composites for holographic optical coherence imaging
Autor: Salvador, Michael
Jahr: 2009
Contents
Contents
1. Introduction 1
2. Research objectives and motivation 4
3. Introduction to photorefractive organic materials 7
3.1. Photorefractivity and holography..................... 8
3.2. The PR effect in inorganic crystals - Kukhtarev s model........ 12
3.3. The physics of photorefractive polymers................. 16
3.3.1. Charge generation......................... 17
3.3.2. Charge transport.......................... 18
3.3.3. Space-charge field formation................... 20
3.3.4. Electro-optic effects in photorefractive polymers........ 24
3.3.4.1. The oriented gas model................. 27
3.3.4.2. Orientational enhancement effect........... 29
3.4. Photorefractive experimental techniques................. 31
3.4.1. Two-beam coupling ........................ 33
3.4.2. Four-wave mixing......................... 36
3.4.3. Photoelectromotive force ..................... 38
3.4.4. Non-photorefractive methods................... 38
3.5. Improving the photorefractive performance............... 39
3.5.1. Optimization of polymer composites .............. 40
3.5.1.1. Sensitizer......................... 40
3.5.1.2. Photoconductor..................... 44
3.5.1.3. NLOChromophores................... 46
3.5.1.4. Plasticizer......................... 51
3.5.1.5. Concluding comments regarding materials design . 52
3.5.2. Tuning of the experimental conditions.............. 53
4. Preillumination effects in a PVK-based PR composite 56
4.1. Photorefractive Sensitivity......................... 56
4.2. Preillumination effects in PR polymers.................. 57
4.3. Preillumination results........................... 61
4.3.1. Material............................... 61
4.3.2. Experimental............................ 66
Contents
4.3.3. PI with blue laser light....................... 70
4.3.4. PI with green laser light...................... 87
4.3.5. PI with red laser light ....................... 95
4.3.6. The low-intensity regime .....................1°*
4.3.7. PreilluminationofTPD-PPV...................104
4.3.8. Bipolar transport in a TPD-PPV-based composite .......106
4.3.9. Summary and conclusions.....................107
5. Holographic imaging H*
5.1. Imaging through scattering media....................112
5.1.1. Overview..............................112
5.1.2. Optical imaging geometries....................115
5.1.3. Optical techniques for imaging through scattering media ... 117
5.1.3.1. Spatial filtering techniques...............118
5.1.3.2. Low-coherence interferometry and OCT.......120
5.2. Holographic imaging domains......................123
5.3. Transillumination holography.......................131
5.3.1. Historical background and status quo..............131
5.3.2. General principle..........................136
5.4. Photorefractive transillumination holography using a polymer com-
posite as the recording medium......................138
5.4.1. Experimental setup.........................139
5.4.2. Resolution..............................143
5.4.3. Holographic imaging of the USAF test target..........145
5.4.4. Holographic imaging of human skin sections..........152
5.4.4.1. The structure of normal human skin .........153
5.4.4.2. Skin sample preparation................156
5.4.4.3. Results of experimental transillumination holography 156
5.4.5. Holographic imaging of trabecular bone samples.......164
5.4.6. Holographic imaging of Arabidopsis thaliana seedlings.....171
5.4.7. Summary and discussion.....................173
5.5. Coherence-gated holographic imaging (HOCI).............175
5.5.1. General principle..........................178
5.5.2. PR recording media for HOCI...................181
5.5.3. Coherence properties in low-coherence interferometry .... 185
5.5.4. Broad-bandwidth light sources for low-coherence interferom-
etry ..................................188
5.5.5. Sensitivity and dynamic range..................192
5.5.6. Spatial resolution..........................196
5.5.6.1. Beamwalk-off......................198
5.5.6.2. Dispersion........................202
5.5.7. Depth-resolved holography with a superluminescent diode . 206
5.5.8. Depth-resolved holography with a femtosecond laser.....212
5.5.8.1. Experimental setup...................213
Contents
5.5.8.2. FDH optical coherence imaging............216
5.5.8.3. IDH optical coherence imaging............227
5.5.8.4. HOCI of rat tumor spheroids..............235
5.5.8.5. HOCI of bone and skin tissue.............248
5.5.9. Summary and discussion.....................249
6. Summary and outlook 254
Appendices 263
A. Device preparation and characterization 264
B. Fourier transformation of a lens 266
C. Abbreviations 269
Bibliography 271
|
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| spelling | Salvador, Michael 1976- Verfasser (DE-588)139090304 aut Photorefractive polymer composites for holographic optical coherence imaging vorgelegt von Michael Salvador 2009 III, 286 S. Ill., graph. Darst. 21 cm txt rdacontent n rdamedia nc rdacarrier Köln, Univ., Diss., 2008 (DE-588)4113937-9 Hochschulschrift gnd-content HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=018885139&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Salvador, Michael 1976- Photorefractive polymer composites for holographic optical coherence imaging |
| subject_GND | (DE-588)4113937-9 |
| title | Photorefractive polymer composites for holographic optical coherence imaging |
| title_auth | Photorefractive polymer composites for holographic optical coherence imaging |
| title_exact_search | Photorefractive polymer composites for holographic optical coherence imaging |
| title_full | Photorefractive polymer composites for holographic optical coherence imaging vorgelegt von Michael Salvador |
| title_fullStr | Photorefractive polymer composites for holographic optical coherence imaging vorgelegt von Michael Salvador |
| title_full_unstemmed | Photorefractive polymer composites for holographic optical coherence imaging vorgelegt von Michael Salvador |
| title_short | Photorefractive polymer composites for holographic optical coherence imaging |
| title_sort | photorefractive polymer composites for holographic optical coherence imaging |
| topic_facet | Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=018885139&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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