研究目的
Exploring the use of liquid crystals as electro-optically active claddings for driving integrated waveguides to enhance the functionality of photonic integrated circuits.
研究成果
The research demonstrates that liquid crystals can be effectively used as active claddings in waveguides with relatively low core refractive indices, enabling the creation of tunable devices such as variable couplers and optical switches. This approach contributes to enhancing the functionality of photonic integrated circuits without increasing their complexity.
研究不足
The study highlights the need for careful design tailored for each set of parameters due to strict working ranges and potential leakage losses. The interaction between core and cladding is significantly reduced for inorganic cores, requiring enhanced evanescent field fractions through reduced waveguide dimensions.
1：Experimental Design and Method Selection:
The study involved modeling and fabricating tunable waveguides using polymers with liquid crystal claddings. The methodology included simulations using COMSOL? finite element suite and experimental setups with direct laser writing of UV-curing polymers.
2：Sample Selection and Data Sources:
Organic materials were evaluated, with the best results obtained from direct laser writing of UV-curing polymers like Ormocore/Ormoclad and Epocore/Epoclad families.
3：List of Experimental Equipment and Materials:
Equipment included a COMSOL? finite element suite, MatLab-R2018b, and WGModes package. Materials used were liquid crystals (Merck MDA-98-1602), polyimide (PIA-2304, Lixon Aligner), and Mylar spacers.
4：Experimental Procedures and Operational Workflow:
The process involved constructing waveguide sections as directional couplers and multimode interference devices, applying LC cells with electric signals, and measuring optical functions like variable coupling and optical switching.
5：Data Analysis Methods:
The electric field distribution in waveguides was calculated using a custom code developed with MatLab-R2018b and scripts from the WGModes package.
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