研究目的
Investigating the optical properties of photonic balls consisting of silica particles with sizes ranging from 220 to 500 nm, focusing on their structural coloration and iridescence.
研究成果
The study successfully assigned the re?ectance peaks of photonic balls to Bragg diffractions of different orders from different crystal planes. It revealed that iridescence was very low in the case of the peripheral re?ection of the photonic ball with large colloidal particles. The spherical shape was found to be effective in reducing iridescence under ambient illumination. The study also discussed methods to enhance color saturation by incorporating small light-absorbing particles.
研究不足
The study acknowledges the complexity of the optical properties of photonic balls due to the involvement of different crystal planes in the coloration mechanism. The mechanical stability of photonic balls for pigment applications may need further enhancement.
1：Experimental Design and Method Selection:
The study involved preparing photonic balls through an evaporation method and analyzing their re?ectance spectra in a nearly backscattering geometry. Theoretical models were used to analyze the angular dependence of re?ection.
2：Sample Selection and Data Sources:
Photonic balls consisting of silica colloidal particles with diameters ranging from 220 to 500 nm were prepared. Optical measurements were performed on these samples.
3：List of Experimental Equipment and Materials:
Silica particles, hexadecane, Span 80, carbon black, optical microscope, digital camera, spectrometer, optical fiber.
4：Experimental Procedures and Operational Workflow:
The photonic balls were prepared by mixing a silica suspension with hexadecane and Span 80, vortexing the mixture, and heating to evaporate water. Optical measurements were conducted after washing and drying the samples.
5：Data Analysis Methods:
The re?ectance spectra were analyzed to identify peaks caused by Bragg diffraction from different crystal planes. The angular dependence of re?ection was characterized and compared with theoretical models.
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