Supercontinuum Generation in Naturally Occurring Glass Sponges Spicules
Supercontinuum Generation in Naturally Occurring Glass Sponges Spicules
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DOI：
10.1002/adom.201600454
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发表时间：
2016-10-01
影响因子：
9
通讯作者：
Tabachnick, Konstantin R.
中科院分区：
文献类型：
--
作者：
Ehrlich, Hermann;Maldonado, Manuel;Tabachnick, Konstantin R.
超连续谱产生（SG）的复杂过程已知可用于设计同时在紫外、可见和红外范围内发射光的空间相干白色光源。本文描述了第一种能够在实验室条件下产生类似于人造光子晶体光纤的超连续谱的天然材料。这种能力存在于玻璃海绵Sericolophus hawaiicus的硅质20-50厘米长的骨针中。通过脱落到针状体的光学峰强度范围从1到100 TW cm（-2），揭示了SG的产生。SG涉及650和900 nm之间的波长，并在750 nm的波长处显示出激发的最大光谱扩展。据推测，SG是由针状体作为生物复合材料所支持的，针状体是将同位素纯的生物二氧化硅（δ（30）Si = -3.28）和15.2 +/-1.3 μ g N -乙酰基-葡糖胺（几丁质）/mg二氧化硅结合在一起的生物复合材料。这些针状体的内部组织的特点是固体二氧化硅核心与1 μ m宽的轴向通道，以及高度有序的二氧化硅-甲壳素复合物。这样的组成和组织模式可能是潜在的兴趣，为未来的光引导材料的低温合成的设计。
The complex process of supercontinuum generation (SG) is known to be exploitable for designing spatially coherent white light sources emitting light simultaneously in the ultraviolet, visible, and infrared ranges. Herein the first natural material able to generate in laboratory conditions a supercontinuum similar to those known from man-made photonic crystal fibers is described. The ability resides in siliceous 20-50 cm long spicules of the glass sponge Sericolophus hawaiicus. By shedding into the spicules optical peak intensities ranging from 1 to 100 TW cm(-2) the generation of a SG is revealed. The SG involves wavelengths between 650 and 900 nm and shows a maximum spectral spread for excitation at a wavelength of 750 nm. It is hypothesized that the SG is favored by spicules being a biocomposite that incorporates together isotopically pure biogenic silica (delta(30) Si = -3.28) and 15.2 +/- 1.3 mu g N -acetyl-glucosamine (chitin) per mg of silica. The internal organization of these spicules is distinguished by a solid silica core with a 1 mu m wide axial channel as well as a highly ordered silica-chitin composite. Such a composition and organization pattern may be of potential interest for the design of low temperature synthesis of future materials for light guidance.