- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[Springer Series in Materials Science] Biomimetics Volume 279 (Bioinspired Hierarchical-Structured Surfaces for Green Science and Technology) || Structural Coloration
摘要： In living nature, flora and fauna produce color through pigments, bioluminescence, or structural coloration (Booth 1990). Biological pigments, or simply pigments, are substances produced by living organisms, which produce color resulting from selective light adsorption and reflection of a specific light wavelength. These include plant and flower pigments, such as green pigment chlorophyll used by plants for photosynthesis. Many biological structures contain pigments such as melanin in skin, eyes, fur, and hair. Bioluminescence is the production and emission of visible light by a living organism. It occurs widely in marine organisms, as well as in some fungi, bacteria, and terrestrial invertebrates, such as fireflies. Structural coloration is the production of color by selective light reflection by nanostructured surfaces with features of the same scale as incident visible light wavelengths (Fox 1976; Kinoshita 2008; Kinoshita et al. 2008; Sun et al. 2013; Yu et al. 2013). While pigments degrade and their colors fade over time, structural coloration can persist for long periods, even after the death of the organism.
关键词： iridescent,nanostructured surfaces,bioluminescence,pigments,structural coloration
更新于2025-09-23 15:21:21
-
Optical Characterization of the Photonic Ball as a Structurally Colored Pigment
摘要： A photonic ball is a spherical colloidal crystal. Because it can exhibit vivid structural colors, many attempts have been made to apply it as a structurally colored pigment. However, the optical properties of the photonic ball are complicated because di?erent crystal planes can be involved in the coloration mechanism, depending on the size of the constituent colloidal particles. In this paper, we report a comparative study of photonic balls consisting of silica particles with sizes ranging from 220 to 500 nm. We ?rst analyze the re?ectance spectra acquired in a nearly backscattering geometry and con?rm that Bragg di?raction from di?erent crystal planes causes several spectral peaks. Second, the angular dependence of re?ection is experimentally characterized and theoretically analyzed with appropriate models. These analyses and a comparison with a planar colloidal crystal reveal that the spherical shape plays an essential role in the minor iridescence of photonic balls. We ?nally discuss a method to enhance color saturation by incorporating small light-absorbing particles. We also discuss the iridescence of the photonic ball under directional and ambient illumination conditions.
关键词： structural coloration,photonic ball,iridescence,colloidal crystal,Bragg diffraction
更新于2025-09-23 15:21:01
-
Lighta??Emitting Nanophotonic Designs Enabled by Ultrafast Laser Processing of Halide Perovskites
摘要： Nanophotonics based on resonant nanostructures and metasurfaces made of halide perovskites have become a prospective direction for efficient light manipulation at the subwavelength scale in advanced photonic designs. One of the main challenges in this field is the lack of large-scale low-cost technique for subwavelength perovskite structures fabrication preserving highly efficient luminescence. Here, unique properties of halide perovskites addressed to their extremely low thermal conductivity (lower than that of silica glass) and high defect tolerance to apply projection femtosecond laser lithography for nanofabrication with precise spatial control in all three dimensions preserving the material luminescence efficiency are employed. Namely, with CH3NH3PbI3 perovskite highly ordered nanoholes and nanostripes of width as small as 250 nm, metasurfaces with periods less than 400 nm, and nanowire lasers as thin as 500 nm, corresponding to the state-of-the-art in multistage expensive lithographical methods are created. Remarkable performance of the developed approach allows to demonstrate a number of advanced optical applications, including morphology-controlled photoluminescence yield, structural coloring, optical-information encryption, and lasing.
关键词： metasurfaces,structural coloration,lasing,halide perovskites,light emission,nanostructures
更新于2025-09-23 15:19:57