Lensless light focusing with the centric marine diatom Coscinodiscus walesii
Lensless light focusing with the centric marine diatom Coscinodiscus walesii
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DOI：
10.1364/oe.15.018082
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发表时间：
2007-12-24
期刊：
影响因子：
3.8
通讯作者：
Moretti, Luigi
中科院分区：
文献类型：
--
作者：
De Stefano, Luca;Rea, Ilaria;Moretti, Luigi
在这项工作中，我们报告的光聚焦能力所利用的微壳的海洋生物：圆筛藻wailesii硅藻。红色激光束的100 μ m的光斑尺寸在透射通过规则几何形状的硅藻结构之后在104 μ m的距离处变窄到小于10 μ m，因此硅藻结构充当微透镜。电磁场传播的数值模拟与实验结果定性一致。聚焦效应是由于硅藻阀表面上存在的孔所散射的波的叠加。由于这些单细胞生物的形态学和生物学特性，在微光学器件中非常有趣的应用是可行的。(c)2007年，美国光学学会。
In this work, we report on the light focusing ability exploited by the microshell of a marine organism: the Coscinodiscus wailesii diatom. A 100 mu m spot size of a red laser beam is narrowed up to less than 10 mu m at a distance of 104 mu m after the transmission through the regular geometry of the diatom structure, which thus acts as a microlens. Numerical simulations of the electromagnetic field propagation show a good qualitative agreement with the experimental results. The focusing effect is due to the superposition of the waves scattered by the holes present on the surface of the diatom valve. Very interesting applications in micro-optic devices are feasible due to the morphological and biological characteristic of these unicellular organisms. (c) 2007 Optical Society of America.