研究目的
To develop a photoresponsive multi‐bilayered film for a tunable photonic crystal that can control the propagation of light through external stimuli, specifically light, to achieve on–off switching of reflection based on refractive index change.
研究成果
The study successfully demonstrates the on–off switching of reflection in 1D photonic crystals through the control of molecular orientation in azobenzene-containing multi‐bilayered films. The introduction of non-photoresponsive LC mesogen groups improved the light-response efficiency. These findings suggest potential applications in optical materials requiring lightweight, thin, and energy-efficient properties, such as reflective color displays and rewritable paper.
研究不足
The main limitations include the incomplete recovery and deformation when structural changes occur on the order of micrometer dimensions, which may affect the practical applications of these materials. Additionally, the response speed to light stimuli needs improvement for certain applications.
1：Experimental Design and Method Selection:
The study focuses on the fabrication of multi‐bilayered films using azobenzene-containing polymers and polyvinyl alcohol (PVA) to create photonic crystals with tunable properties. The methodology includes spin coating and photoisomerization techniques.
2：Sample Selection and Data Sources:
The samples are multi‐bilayered films composed of alternating layers of a hydrophobic azobenzene polymer and hydrophilic PVA. Data is collected through reflection spectroscopy and SEM imaging.
3：List of Experimental Equipment and Materials:
Spin coater, UV light source, SEM, azobenzene polymers, PVA, cyclohexanone, water.
4：Experimental Procedures and Operational Workflow:
The films are prepared by spin coating alternate layers of azobenzene polymer and PVA. The reflection properties are then modulated through thermal annealing and UV irradiation to induce molecular orientation changes.
5：Data Analysis Methods:
Reflection spectra are analyzed to determine the photonic band gap shifts, and SEM is used to characterize the film morphology.
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