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Wing scales cause light to diffract and interfere: Morpho butterflies

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Morpho butterfly scales / Emily Harrin.. / LicenseCopyright - All Rights Reserved

Wings of Morpho butterflies create color by causing light waves to diffract and interfere

Many types of butterflies use light-interacting structures on their wing scales to produce color. The cuticle on the scales of these butterflies’ wings is composed of nano- and microscale, transparent, chitin-and-air layered structures. Rather than absorb and reflect certain light wavelengths as pigments and dyes do, these multi scale structures cause light that hits the surface of the wing to diffract and interfere. Cross ribs that protrude from the sides of ridges on the wing scale diffract incoming light waves, causing the waves to spread as they travel through spaces between the structures. The diffracted light waves then interfere with each other so that certain color wavelengths cancel out (destructive interference) while others are intensified and reflected (constructive interference). The varying heights of the wing scale ridges appear to affect the interference such that the reflected colors are uniform when viewed from a wide range of angles. The specific color that’s reflected depends on the shape of the structures and the distance between them. This way of manipulating light results in brilliant iridescent colors, which butterflies rely upon for camouflage, thermoregulation, and signaling.

Morpho butterfly wings have tiny scales covered with microscopic ridges, cross ribs, and other structures. These play with light waves to create brilliant blues and speckles. The structure, instead of a chemical, creates the color. Artist: Emily Harrington. Copyright: All rights reserved. See gallery for details.

Check out this video from Veritasium for a deeper overview of how butterflies' brilliant color results from nano- and microstructures:
Video content ©Veritasium, All Rights Reserved.
"Brilliant iridescent colouring in male butterflies enables long-range conspecific communication and it has long been accepted that microstructures, rather than pigments, are responsible for this coloration. Few studies, however, explicitly relate the intra-scale microstructures to overall butterfly visibility, both in terms of reflected and transmitted intensities and viewing angles.

"Using a focused-laser technique, we investigated the absolute reflectivity and transmissivity associated with the single-scale microstructures of two species of Morpho butterfly and the mechanisms behind their remarkable wide-angle visibility. Measurements indicate that certain Morpho microstructures reflect up to 75% of the incident blue light over an angle range of greater than 100 degree in one plane and 15 degree in the other.

"We show that incorporation of a second layer of more transparent scales, above a layer of highly iridescent scales, leads to very strong diffraction, and we suggest this effect acts to increase further the angle range over which incident light is reflected.

"Measurements using index-matching techniques yield the complex refractive index of the cuticle material comprising the single-scale microstructure to be n=(1.56 plus or minus 0.01) + (0.06 plus or minus 0.01)i. This figure is required for theoretical modelling of such microstructure systems." (Vukusic et al. 1999:1403)

(i) Lamellar structure in a ridge offers constructive interference, which results in the strong reflection within a selective wavelength range. (ii) The irregularity in the ridge height eliminates the interference among the ridges, which results in the diffuse and broad reflection of a uniform colour. Thus, the combined action of interference and diffraction due to the separate lamellar structure is essential for the structural colour....(iv) The irregularity in ridge height also results in the accidental interference of scattered light in space, manifesting as the glittering speckles..." (Kinoshita et al. 2002:1420-1421)
About the inspiring organism
Med_morphorhetenornanostructure_v2 Blue Morpho
Morpho rhetenor Cramer 1775

Habitat(s): Forest
Learn more at
Some organism data provided by: LepIndex: The Global Lepidoptera Names Index
Organism/taxonomy data provided by:
Species 2000 & ITIS Catalogue of Life: 2008 Annual Checklist

IUCN Red List Status: Unknown

Bioinspired products and application ideas

Application Ideas: Human-made systems of structurally-produced color that do not require the toxic heavy-metals or manufacturing methods common to many pigments and dyes (e.g., for iridescent fabrics and cosmetics). Creating high-performance electronic color displays by actively varying the interspatial distances of light-interacting layers (e.g., for cell phones), which can change colors rapidly, remain vibrant under low-light conditions, and require less energy than other electronic display methods.

Industrial Sector(s) interested in this strategy: Textiles, buildings, manufacturing, transportation, health and beauty

Natural Photonics and Disordered Systems
Dr. Peter Vukusic, Prof. Roy Sambles, Dr. Jacopo Bertolotti
University of Exeter
Vukusic P; Sambles JR; Lawrence CR; Wootton RJ. 1999. Quantified interference and diffraction in single Morpho butterfly scales. Proceedings of the Royal Society B: Biological Sciences. 266(1427): 1403-1411.
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Yoshioka, S.; Kinoshita, S. 2004. Wavelength-selective and anisotropic light-diffusing scale on the wing of the Morpho butterfly. Proceedings: Biological Sciences. 271(1539): 581-587.
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Prum, R. O.; Quinn, T.; Torres, R. H. 2006. Anatomically diverse butterfly scales all produce structural colours by coherent scattering. Journal of Experimental Biology. 209(4): 748-765.
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Vukusic, P. 2006. Structural colour in Lepidoptera. Current Biology. 16(16): R621-R623.
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Kinoshita S; Yoshioka S; Kawagoe K. 2002. Mechanisms of structural colour in the Morpho butterfly: cooperation of regularity and irregularity in an iridescent scale. Proc. R. Soc. Lond. B. 269: 1417–1421.
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over 4 years ago
Here's a great video for teaching students about how the Morpho butterfly uses structural color:
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