Noh Heeso, Liew Seng Fatt, Saranathan Vinodkumar, Prum Richard O, Mochrie Simon G J, Dufresne Eric R, Cao Hui
Department of Applied Physics, Center for Research on Interface Structure and Phenomena, Yale University, New Haven 06511, USA.
Opt Express. 2010 May 24;18(11):11942-8. doi: 10.1364/OE.18.011942.
We investigate the physical mechanism for color production by isotropic nanostructures with short-range order in bird feather barbs. While the primary peak in optical scattering spectra results from constructive interference of singly-scattered light, many species exhibit secondary peaks with distinct characteristic. Our experimental and numerical studies show that these secondary peaks result from double scattering of light by the correlated structures. Without an analog in periodic or random structures, such a phenomenon is unique for short-range ordered structures, and has been widely used by nature for non-iridescent structural coloration.
我们研究了鸟类羽毛倒刺中具有短程有序的各向同性纳米结构产生颜色的物理机制。虽然光学散射光谱中的主峰是由单次散射光的相长干涉引起的，但许多物种表现出具有独特特征的次峰。我们的实验和数值研究表明，这些次峰是由相关结构对光的双重散射引起的。这种现象在周期性或随机结构中没有类似情况，对于短程有序结构来说是独一无二的，并且已被自然界广泛用于产生非虹彩结构色。
