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Microstructured fibers with liquid crystals: tuning of optical transmission and dispersion / vorgelegt von Markus Wahle. Paderborn, 2017
Inhalt
Summary
Zusammenfassung
Introduction
History of optical fibers
History of liquid crystals
Photonic crystal fibers, microstructured optical fibers & liquid crystals
Theoretical background
Liquid crystals
Basic properties of nematic liquid crystals
Order parameter
Anisotropic properties
Losses due to light scattering
The Frank-Oseen free energy
Euler Lagrange equations
Dielectric and optical properties of liquid crystals
Dielectric properties
Optical properties
Liquid crystal displays: Basic principle
Light transmission through birefringent media
The Fréedericksz transition
Alignment techniques for liquid crystals
Degenerate planar anchoring
Homogeneous planar anchoring
Homeotropic anchoring
Liquid crystals in circular capillaries
Basic fiber optics
Introduction
Maxwell equations
Uniaxial step index fiber
The ray picture
Wave equation for optical waveguides
Fiber modes
Coupled mode theory
Basic principle
Coupled mode equations
Examples
Photonic crystal fibers & photonic band gap fibers
Photonic crystal fibers
Photonic band gap fibers
Dispersion properties of optical fibers
Four wave mixing
Phase matching condition
Phase matching & waveguide dispersion
Experimental results
Microstructured optical fibers
Liquid crystal filled microstructured optical fibers
Experimental details
Types of microstructured optical fibers
Liquid crystals
Inclusion surface treatment & filling procedure
Measurement & Characterization
Results & Discussion
Fiber I filled with MLC2103
Fiber I filled with BL036
Fiber II filled with BL036/E7
Liquid crystal photonic crystal fibers
Properties of photonic crystal fibers & photonic band gap fibers
Polarizing capabilities of liquid crystal photonic crystal fibers
Effective indices, group velocity & dispersion in liquid crystal photonic crystal fibers
Four wave mixing in PBGFs & hybrid guiding fibers
Experiments
Fiber specifications
Sample preparation
Liquid crystal materials
Group delay measurements
Results
Planar aligned liquid crystal photonic crystal fibers
Homeotropically aligned liquid crystals in photonic crystal fibers
Homeotropically aligned liquid crystals in hybrid PCFs
Phase matching in hybrid guiding fibers
Conclusion & Outlook
Conclusion
Outlook
Acknowledgements
Appendix
Refractive indices of silica and Germanium doped silica
Refractive index measurements
Refractometer
Cauchy fit
Liquid crystal mixtures
E7
BL036
MLC2103
MLC2048
Bibliography
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