研究目的
To fabricate a broadband quarter wave plate (QWP) that can serve as a circular polarizer providing true dark in the display system by combining two waveplates with different alignment directions using a coating technique.
研究成果
The combination of two waveplates is a promising method to realize broadband quarter wave plates using coating techniques. The method can be adapted for other waveplate materials with proper alignment and combination techniques. Future work may focus on optimizing the dark state through precise calculations or exploring other retardation film combinations.
研究不足
The 'adhere directly' method places the broadband QWP between two glasses, making it difficult to produce large prototypes without bubbles. The 'buffer layer' method introduces interference in the reflection spectrum due to the buffer layer's thickness.
1：Experimental Design and Method Selection:
The study involves the fabrication of a broadband QWP by combining two waveplates (QWP and HWP) made from liquid crystal polymer (LCP) UCL017 using spin-coating and photoalignment techniques.
2：Sample Selection and Data Sources:
The LCP UCL017 is chosen for its birefringence and ease of coating. Thickness measurements are taken under different spin-coating speeds and concentrations.
3：List of Experimental Equipment and Materials:
Includes UCL017 LCP, spin coater, UV light for curing, photoalignment materials, and optical adhesives.
4：Experimental Procedures and Operational Workflow:
Two methods are employed to combine the waveplates: direct adherence using UV-curing optical adhesives and adding a buffer layer (parylene) to protect the first waveplate.
5：Data Analysis Methods:
Reflection spectrum measurements are used to evaluate the performance of the fabricated broadband QWP.
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