Lighting is important in the evaluation of photonic crystals! Here is some literature information that may be helpful.
The photos showing the structural color of the sample were taken with a digital camera and a digital microscope (KEYENCE VHX-500). For angle dependence, two types of illumination were used. The first type (diffused light) is illumination that does not come from a specific direction, and the sample is illuminated by several ceiling lights and secondary scattering from the walls. The second type is illumination via fiber (Olympus, LG-PS2). The illumination light is directed from approximately 50 degrees tilted from the normal direction. The arrangement of silica particles in the secondary particles was evaluated using an electron microscope. *For more detailed information, please refer to the related links. For further inquiries, feel free to contact us.
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The advent of nanoscale materials has made it possible for materials science to have direct connections with biology, optics, and other fields. Photonic crystals and structural colors found in birds and insects are good examples of this. Until now, we have worked with various materials such as semiconductors, carbon materials, metals, oxides, and polymers. Leveraging this experience, we hope to be able to assist you in solving your "problems."