| AVS 64th International Symposium & Exhibition | |
| Applied Surface Science Division | Wednesday Sessions |
| Session AS+2D+NS+SA-WeA |
| Session: | 2D, 3D and nD Imaging of Surfaces, Buried Interfaces and Nanostructures |
| Presenter: | Ashley Ellsworth, Physical Electronics |
| Authors: | A.A. Ellsworth, Physical Electronics D.M. Carr, Physical Electronics G.L. Fisher, Physical Electronics W.W. Valeriano, Universidade Federal de Minas Gerais, Brazil R.R. de Andrade, Universidade Federal de Minas Gerais, Brazil J.P. Vasco, Universidade Federal de Minas Gerais, Brazil E.R. da Silva, Universidade Federal de Minas Gerais, Brazil A.B.M. Machado, Universidade Federal de Minas Gerais, Brazil P.S.S. Guimarães, Universidade Federal de Minas Gerais, Brazil W.N. Rodrigues, Universidade Federal de Minas Gerais, Brazil |
| Correspondent: | Click to Email |
The male Amazonian glitterwing (Chalcopteryx rutilans) dragonfly has transparent anterior wings and brightly colored iridescent posterior wings. The colors are important for dragonflies with regard to sexual recognition, mating, and territorial behavior. The source of the varying colors was determined by Valeriano [1] using electron microscopy and optical reflectance to analyze the internal microstructures. SEM and TEM images revealed that the iridescent wings have multiple alternating layers with different electronic densities. The variation of the local color was related to the number and thickness of the layers which varied across the wing. The colors span the visible spectrum with red, blue, and yellow/green regions on the wings. The experimental reflectance was calculated and fitted through the transfer matrix method for the structure obtained from the electron microscopy images. Measurement of the thickness and number of layers is readily achievable by electron microscopy, however it is unable to characterize the chemistry of the different layers giving rise to these natural photonic crystals.
TOF-SIMS is a well-established technique for analyzing the elemental and molecular chemistry of surfaces. TOF-SIMS can now be used to probe the 3D structure and chemistry of a wide variety of organic and inorganic materials, both synthetic and naturally occurring, due to the advent of cluster ion beams such as C60+ and large cluster Arn+. We will present results of 3D TOF-SIMS analyses for both transparent and colored wings to correlate with the electron microscopy and optical results to further the understanding of these natural photonic crystals.
[1] W.W.Valeriano, Masters dissertation, UFMG, 2016. Retrieved from http://www.fisica.ufmg.br/posgrad/Dissertacoes_Mestrado/decada2010/wescley-valeriano/WescleyWalisonValeriano-diss.pdf.