Non-polarizing broadband multilayer reflectors in fish.

Non-polarizing broadband multilayer reflectors in fish.
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DOI:
10.1038/nphoton.2012.260
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发表时间:
2012-11
期刊:
影响因子:
35
通讯作者:
--
中科院分区:
物理与天体物理1区
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--
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非偏振的介质多层反射器是一类重要的光学器件,并且在光纤、介质波导和LED中具有许多应用。在这里,我们报告分析的生物非偏振光学机制中发现的宽带鸟嘌呤细胞质“银”多层反射器的三种鱼。存在于鱼类的银层中的是两个群体的双折射鸟嘌呤晶体,每一个的光轴平行于晶体的长轴或垂直于晶体的平面。这种布置中和了由于每个群体的不同界面布鲁斯特角引起的反射偏振。鱼反射机制是不同于现有的非偏振镜设计的重要特征,即在反射器中的低折射率层和外部环境之间没有折射率对比。这是一种可以容易地制造和开发合成光学设备的机制。
Dielectric multilayer reflectors that are non-polarizing are an important class of optical device and have numerous applications within optical fibres, dielectric waveguides and LEDs. Here we report analyses of a biological non-polarizing optical mechanism found in the broadband guanine-cytoplasm “silver” multilayer reflectors of three species of fish. Present in the fish stratum argenteum are two populations of birefringent guanine crystal, each with their optic axes either parallel to the long axis of the crystal or perpendicular to the plane of the crystal. This arrangement neutralizes the polarization of reflection due the different interfacial Brewster’s angles of each population. The fish reflective mechanism is distinct from existing non-polarizing mirror designs with the important feature that there is no refractive index contrast between the low index layers in the reflector and the external environment. It is a mechanism that could be readily manufactured and exploited in synthetic optical devices.
DOI: 10.1098/rspa.1995.0144
发表时间: 1995-12-08
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