翡翠贻贝珍珠层的光子彩虹色表征及理论模拟

Characterization and Theoretical Simulation of Photonic Iridescence of Nacre in Perna Viridis

利用光纤光谱仪、扫描电镜及理论模拟软件对翡翠贻贝珍珠层的彩虹色及微结构进行系统的研究。结果表明,珍珠层具有由文石板片与有机质交替排列形成的典型的一维光子晶体结构;其中文石板片的厚度从生长区的392nm逐渐增大到壳中区的537nm,导致反射光谱中同级别光子带隙出现明显的红移现象;珍珠层彩虹色的主波长从480nm(蓝色)增大到527nm(绿色)。反射光谱测定及理论模拟表明,该珍珠层的2～4级光子带隙位于紫外区、蓝色和红色范围,从而导致珍珠层具有复杂的彩虹色。

The iridescence and microstructure of nacre in Perna viridis are investigated by fiber spectrometer, scanning electron microscope （SEM） and theoretical simulated software. The following results are obtained： nacre has a typical one-dimensional photonic crystal structure that consists of aragonite sheet and organic matrix; thickness of aragonite sheets gradually increases from 392 nm in growing region to 537 nm in mature region of nacre, which leads to an obvious red shift of photonic band gaps with the same order; dominant wavelength of different regions of nacre increases from 480 nm （blue） to 527 nm （green）. The results of measured reflection spectra and theoretical simulation indicate that the 2-4 order photonic band gaps of nacre are in ultraviolet, blue and red band, which cause the complicated iridescence of nacre.