Kieu K, Li C, Fang Y, Cohoon G, Herrera O D, Hildebrand M, Sandhage K H, Norwood R A
Opt Express. 2014 Jun 30;22(13):15992-9. doi: 10.1364/OE.22.015992.
Diatoms are a renewable (biologically reproducible) source of three-dimensional (3-D) nanostructured silica that could be attractive for a variety of photonic devices, owing to the wide range of quasi-periodic patterns of nano-to-microscale pores available on the silica microshells (frustules) of various diatom species. We have investigated the optical behavior of the silica frustule of a centric marine diatom, Coscinodiscus wailesii, using a coherent broadband (400-1700 nm) supercontinuum laser focused to a fine (20 µm diameter) spot. The C. wailesii frustule valve, which possessed a quasi-periodic hexagonal pore array, exhibited position-dependent optical diffraction. Changes in such diffraction behavior across the frustule were consistent with observed variations in the quasi-periodic pore pattern.
硅藻是三维（3-D）纳米结构二氧化硅的可再生（生物可复制）来源，由于各种硅藻物种的二氧化硅微壳（硅藻壳）上存在纳米到微米尺度孔隙的广泛准周期性图案，它们可能对各种光子器件具有吸引力。我们使用聚焦到精细（直径20微米）光斑的相干宽带（400 - 1700纳米）超连续激光，研究了一种中心海洋硅藻——威氏圆筛藻（Coscinodiscus wailesii）的硅藻壳的光学行为。具有准周期性六边形孔阵列的威氏圆筛藻的硅藻壳瓣表现出位置依赖性光学衍射。整个硅藻壳上这种衍射行为的变化与观察到的准周期性孔图案的变化一致。
