![]() ![]() 8 Structural colours are also beneficial for generating bright and stable irradiance over large viewing angles, which contradicts the definition of irradiance definition. 4–7 Intricate natural structural colours remain intact and brilliant even after millions of years. 3 Natural sub-wavelength optical phenomena based on reflection, diffraction, polarization, and absorption have different applications in displays, bio-chemical sensing, energy harvesting and solar cells. 2 Moreover, green fluorescent protein (GFP), first isolated from jellyfish, also known as optical highlighters, has found many applications in modern science and medicine. 1 Natural species including birds, beetles, flowers, fishes, and seashells show photonic nanostructures that enable bright structural colors. ![]() Introduction The natural colour of many insects is due to the complex structure of their wings and scales that cause light diffraction, interference, scattering etc. Finally, Morpho peleides-butterfly based submicron nanostructures were utilized to demonstrate bio-inspired chemical sensing. The maximum optical diffusion property at ∼185° from the wing scales was observed using broadband light at normal illumination. Light diffraction and diffusion properties were measured by angle-resolve experiments, followed by computational modelling. Polyvinyl alcohol (PVA) embedded with Morpho peleides-butterfly wing scales acts as an optical diffuser to produce soft light. The periodic nanostructures showed well-defined first-order diffraction through monochromatic (red, green and blue) and broadband light at normal illumination. Broadband reflection variation was observed from different parts of the dorsal wings at broadband light illumination due to tiny structural variations, as verified by electronic microscopic images. The light diffraction property from wing scales was investigated through experiments and computation modelling. Herein, the structural optical properties of the Morpho peleides-butterfly wing scales were examined through light reflection, diffraction and optical diffusion. Morpho-butterfly is well-known for the blue colouration in its tiny wing scales and finds applications in colour filters, anti-reflecting coatings and optical devices. ![]()
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