Disordered animal multilayer reflectors and the localization of light.
Disordered animal multilayer reflectors and the localization of light.
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DOI：
10.1098/rsif.2014.0948
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发表时间：
2014-12-06
期刊：
影响因子：
--
通讯作者：
Roberts NW
中科院分区：
文献类型：
--
作者：
Jordan TM;Partridge JC;Roberts NW
由高折射率和低折射率介质材料交替层叠而成的多层光学反射器在许多动物中都存在。例如，鱼的皮肤和鳞片中有成堆的带有细胞质间隙的鸟嘌呤晶体，头足类动物的虹膜生物体内也有成堆的有细胞质间隙的蛋白质小板层。所有这些动物多层反射器的共同之处是，堆叠中各个层的厚度存在不同程度的随机变化，从高度周期性的结构到强烈无序的系统。然而，以前对这种厚度无序的光学效应的讨论没有定量参考反射器内的光传播。在这里，我们证明了安德森定域化提供了一个一般的理论框架来解释这些生物反射体的共同相干干涉和光学性质。首先，我们说明了局域化长度如何使更弱无序的有色反射器和更强无序的银色反射器的反射光谱特性能够用相同的物理过程来解释。其次，我们展示了如何在鸟嘌呤-细胞质反射器中控制反射的偏振特性，双折射和厚度无序的相互作用解释了宽带偏振不敏感反射率的起源。
Multilayer optical reflectors constructed from ‘stacks’ of alternating layers of high and low refractive index dielectric materials are present in many animals. For example, stacks of guanine crystals with cytoplasm gaps occur within the skin and scales of fish, and stacks of protein platelets with cytoplasm gaps occur within the iridophores of cephalopods. Common to all these animal multilayer reflectors are different degrees of random variation in the thicknesses of the individual layers in the stack, ranging from highly periodic structures to strongly disordered systems. However, previous discussions of the optical effects of such thickness disorder have been made without quantitative reference to the propagation of light within the reflector. Here, we demonstrate that Anderson localization provides a general theoretical framework to explain the common coherent interference and optical properties of these biological reflectors. Firstly, we illustrate how the localization length enables the spectral properties of the reflections from more weakly disordered ‘coloured’ and more strongly disordered ‘silvery’ reflectors to be explained by the same physical process. Secondly, we show how the polarization properties of reflection can be controlled within guanine–cytoplasm reflectors, with an interplay of birefringence and thickness disorder explaining the origin of broadband polarization-insensitive reflectivity.
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DOI：
10.1073/pnas.1222125110
发表时间：
2013-06-11
影响因子：
11.1
作者：
Brady, Parrish C.;Travis, Kort A.;Cummings, Molly E.
通讯作者：
Cummings, Molly E.
影响因子：
3.9
作者：
Eliason, Chad M.;Shawkey, Matthew D.
通讯作者：
Shawkey, Matthew D.
影响因子：
3.7
作者：
Asatryan, Ara A.;Botten, Lindsay C.;Kivshar, Yuri S.
通讯作者：
Kivshar, Yuri S.
影响因子：
3.7
作者：
Bliokh, KY;Freilikher, VD
通讯作者：
Freilikher, VD
影响因子：
--
作者：
BERREMAN, DW
通讯作者：
BERREMAN, DW