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Structural colour

Structural colour is a term used to describe objects that do not have any pigment yet get their colours from the light reflected in microstructures (Nanostructure). Manipulating the brain’s way perceiving colours. In nature, tremendous numbers of orders and patterns are generated spontaneously, which enliven our surroundings. One of the most remarkable consequences of these processes reveals itself as a so-called structural colour, which exhibits striking brilliance owing to elaborate structures furnished with living creatures.

The invisible light

They sometimes reflect surprisingly intense light in a wide angular range, while in other cases prohibit any reflection of light. These functions are natural consequences of complicated interactions between light and the structures through purely physical properties of light. The scientific definition of structural colour has not settled, and its characteristics often referred to in contrast to pigmentary colour. When a substance illuminated with white light, we see a specific colour if the reflected light of only a wavelength range is visible to our eyes. See Superhydrophobic surface

Wavelength of light

There are two ways to eliminate the other wavelengths of view: one is the case where the sun is absorbed in a material, which is usually the case for ordinary colouration mechanisms in colour materials such as in pigments, dyes, and metals. In these materials, the illuminating light interacts with electrons and excites them to higher excited states by the energy consumption of light. The colour, in this case, is any way caused by the exchange of energies between light and the electrons. When light reflected or deflected (light reflectance) from reaching the eyes owing to the presence of the structure.

Light reflection

The colouration, in this case, is based on a purely physical operation of light that interacts with various types of spatial inhomogeneity. Thus, it does not essentially involve loss of light energy. In this sense, fundamental optical processes such as reflection, refraction, interference, diffraction, and scattering can become sources of structural colours. Even a simple prism should be categorised into this type of structural colour because the light waves with different wavelengths are deflected differently by its wavelength-dependent refractive index. In general, the mechanisms of structural colours categorised into several optical phenomena such as thin-film interference, multilayer interference, diffraction grating and photonic crystals.

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