Valeriano Wescley Walison, Andrade Rodrigo Ribeiro, Vasco Juan Pablo, Malachias Angelo, Neves Bernardo Ruegger Almeida, Guimarães Paulo Sergio Soares, Rodrigues Wagner Nunes
Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-901 Belo Horizonte, Minas Gerais, Brazil.
Centro de Microscopia, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-901 Belo Horizonte, Minas Gerais, Brazil.
Beilstein J Nanotechnol. 2021 Jan 28;12:139-150. doi: 10.3762/bjnano.12.11. eCollection 2021.
The aim of this work is to determine the varying dielectric constant of a biological nanostructured system via electrostatic force microscopy (EFM) and to show how this method is useful to study natural photonic crystals. We mapped the dielectric constant of the cross section of the posterior wing of the damselfly with nanometric resolution. We obtained structural information on its constitutive nanolayers and the absolute values of their dielectric constant. By relating the measured profile of the static dielectric constant to the profile of the refractive index in the visible range, combined with optical reflectance measurements and simulation, we were able to describe the origin of the strongly iridescent wing colors of this Amazonian rainforest damselfly. The method we demonstrate here should be useful for the study of other biological nanostructured systems.
这项工作的目的是通过静电力显微镜（EFM）测定生物纳米结构系统的变化介电常数，并展示该方法如何有助于研究天然光子晶体。我们以纳米分辨率绘制了豆娘后翅横截面的介电常数。我们获得了其组成纳米层的结构信息及其介电常数的绝对值。通过将测得的静态介电常数分布与可见光范围内的折射率分布相关联，结合光学反射率测量和模拟，我们能够描述这种亚马逊雨林豆娘翅膀强烈虹彩颜色的起源。我们在此展示的方法应有助于研究其他生物纳米结构系统。
