Volume 119, Number 6, September 2017
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||29 November 2017|
Exploring structural colour in uni- and multi-coloured butterfly wings and Ag+ uptake by scales
Nanoscience and Soft Matter Laboratory, Department of Physics, Tezpur University - PO: Napaam, Tezpur, Assam 784028, India
Received: 12 April 2017
Accepted: 17 October 2017
We discuss the origin of the structural colour of different butterfly wings in the light of the typical built-in microstructural arrangement of scales that are comprised of chitin-melanin layer and air-gaps. Three specimens of butterfly wings namely, Papilio Liomedon (black), Catopsilia Pyranthe (light green) and Vanessa Cardui (multi-coloured) were chosen and diffuse reflectance characteristics have been aquired for normal incidence of p-polarized light. Moreover, the time-dependent uptake of Ag+ into scales has led to swelling and spread of the chitinous ridges and ribs, with revelation of micro-beads in Catopsilia Pyranthe specimen. The reduction of the number of air-gaps between any two parallel ridges is attributed to the merging of adjacent gaps possessing a common boundary. The availability of Ag at the centre of a chosen ridge, for every wing type, follows an exponential growing trend, . Precise inclusion of nanoscale metals into natural photonic systems would provide new insight, while applying principles of photonics and plasmonics simultaneously.
PACS: 61.46.-w – Structure of nanoscale materials / 78.40.-q – Absorption and reflection spectra: visible and ultraviolet / 68.37.-d – Microscopy of surfaces, interfaces, and thin films
© EPLA, 2017
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