Acta Optica Sinica, Volume. 34, Issue 4, 416005(2014)
Study on Microstructure and UV-Vis Spectra Characteristics of Natural-Color Golden Seawater Cultured Pearl
A comparative studies on the morphology of micro/nano-structure, the thickness of nacreous layer of natural-color golden seawater cultured pearl with different diameters and golden shades are carried out by ultra-violet and visible (UV-Vis) absorption spectrum, scanning electron microscopy (SEM) and high resolution transmission electronmicroscopy (HR-TEM). Furthermore, the relations between the thickness of nacreous layer and the color and the unique characteristic of UV-Vis spectra are further discussed. The results show that: the intensity of absorption band in UV-Vis absorption spectra is increasing as the deep color of golden-color pearl, the deep or light color of golden-color pearl has no direct relation with the thickness of nacreous layer. It is found that the thickness of nacreous layer located in different regions on the surface of golden-color pearl is different. Meanwhile, the density of “imbricate” structure and the morphology of the surface of golden-color pearl are different. The above characteristics maybe result to the slight varied UV-Vis absorption spectra with different regions on the surface of nacreous layer. In addition, one dimensional quasi-photonic bad gap structure exists in the nacreous layer of golden-color pearl, which should have close relations with the coloring of golden pearl and the density of golden-color.
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Yan Jun, Tao Jinbo, Ren Yeye, Wang Meiqing, Hu Xianchao, Wang Xiaoxiang. Study on Microstructure and UV-Vis Spectra Characteristics of Natural-Color Golden Seawater Cultured Pearl[J]. Acta Optica Sinica, 2014, 34(4): 416005
Category: Materials
Received: Oct. 24, 2013
Accepted: --
Published Online: Mar. 25, 2014
The Author Email: Jun Yan (yanj_zjut@163.com)