Chirality-induced polarization effects in the cuticle of scarab beetles: 100 years after Michelson

Arwin, Hans; Magnusson, Roger; Landin, Jan; Järrendahl, Kenneth

doi:10.1080/14786435.2011.648228

Cited by 85 publications

(73 citation statements)

References 34 publications

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“…Esta es una aplicación en el campo del análisis de color estructural, un campo de investigación cuyo interés ha venido creciendo rápidamente debido al potencial desarrollo de instrumentos y materiales cuyas propiedades ópticas sean muy influenciadas por su microestructura. Evaluaciones como las que se reportan aquí, consisten en calcular el efecto producido cuando luz no polarizada [43] o polarizada [44] incide sobre estructuras periódicas que contienen quitina como uno de sus constituyentes, y está enmarcada en el área de los bio-materiales. El Poecilocoris lewisi es un pequeño insecto (de unos 15 mm de longitud) que puede ser encontrado en localidades de Japón y China [45].…”

Section: Análisis De Coloración Estructuralunclassified

Refractive indices of chitin, chitosan, and uric acid with application to structural color analysis

Vargas¹

2013

Opt. Pura Apl.

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Índices de refracción de la quitina, el quitosano y el ácido úrico con aplicación en análisis de color estructural RESUMEN:Las propiedades ópticas de los polímeros naturales quitina y quitosano, así como las del ácido úrico, han sido consideradas para longitudes de onda entre 0.25 y 0.75 m. En primer lugar, mediante la inversión de datos publicados del índice de refracción para polímeros compuestos tanto de quitosano como de quitina, se ha podido obtener la dependencia espectral de los índices de refracción de ambos materiales. En segundo lugar, se llevaron a cabo mediciones de reflexión y transmisión de luz no polarizada a muestras obtenidas de camarones frescos. A partir de estas mediciones espectrofotométricas se ha obtenido el índice de refracción del medio compuesto por quitina y ácido úrico, y su correspondiente coeficiente de extinción para el intervalo espectral antes mencionado. La absorción de luz por la quitina es despreciable para las longitudes de onda consideradas. El coeficiente de extinción del ácido úrico muestra bandas de absorción en el ultravioleta cercano. Las mediciones de absorbancia confirman la presencia de ácido úrico en las muestras de quitina obtenidas de camarones frescos. A manera de ejemplo ilustrativo, las constantes ópticas de la quitina se utilizan para modelar el color estructural de un chinche asiático: el Poecilocoris lewisi.Palabras clave: Biopolímeros, Índice de Refracción, Coeficiente de Extinción, Color Estructural, Multicapas. ABSTRACT:The optical properties of chitin and chitosan natural polymers, as well as uric acid, have been considered for wavelengths between 0.25 and 0.75 m. First, by inverting refractive index data published for chitin-chitosan composite samples, it was possible to obtain the spectral dependence of the refractive indices of both materials. Reflection and transmission measurements of non-polarized light were carried out from samples of fresh shrimp shells. From these spectrophotometric measurements we obtained the refractive index of the composite medium chitin-uric acid as well as the corresponding extinction coefficient through the mentioned spectral wavelength range. The absorption of light by the chitin is negligible for the wavelengths considered. The extinction coefficient of uric acid shows absorption bands in the near ultraviolet. Absorbance measurements confirm the presence of uric acid in the chitin samples obtained from fresh shrimps. By way of illustrative example, the optical constants of chitin are used to model the structural color of a shield bug from Asia: the Poecilocoris lewisi.

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Section: Análisis De Coloración Estructuralunclassified

Refractive indices of chitin, chitosan, and uric acid with application to structural color analysis

Vargas¹

2013

Opt. Pura Apl.

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“…[325] Multilayer structures can be chirped, i.e., have a varying distance between layers of refractive index, [292] or twisted, resulting in strongly circularly polarized reflected light. [326][327][328] A combination of chirping with a twisted Bouligand-type helicoidal structure causes the brilliant silver and golden reflections of jeweled beetles ( Figure 14B). [329][330][331] Disorder in all directions results in a white color.…”

Section: Structural Colorationmentioning

confidence: 99%

It's Not a Bug, It's a Feature: Functional Materials in Insects

2018

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Over the course of their wildly successful proliferation across the earth, the insects as a taxon have evolved enviable adaptations to their diverse habitats, which include adhesives, locomotor systems, hydrophobic surfaces, and sensors and actuators that transduce mechanical, acoustic, optical, thermal, and chemical signals. Insect‐inspired designs currently appear in a range of contexts, including antireflective coatings, optical displays, and computing algorithms. However, as over one million distinct and highly specialized species of insects have colonized nearly all habitable regions on the planet, they still provide a largely untapped pool of unique problem‐solving strategies. With the intent of providing materials scientists and engineers with a muse for the next generation of bioinspired materials, here, a selection of some of the most spectacular adaptations that insects have evolved is assembled and organized by function. The insects presented display dazzling optical properties as a result of natural photonic crystals, precise hierarchical patterns that span length scales from nanometers to millimeters, and formidable defense mechanisms that deploy an arsenal of chemical weaponry. Successful mimicry of these adaptations may facilitate technological solutions to as wide a range of problems as they solve in the insects that originated them.

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“…The Chrysina genus is of particular interest since circular polarization effects have been observed in several of its many species and it was in this genus these effects were first observed. However, it should be pointed out that circular polarization effects have been observed in beetles in other subfamilies like the Cetoniinae [16,21,26]. Using Mueller-matrix spectroscopic ellipsometry (MMSE) [27] in combination with structural characterization by optical microscopy and cross-sectional scanning electron microscopy (SEM) we find that, even if there is a variation in the visual coloration and patterning of the beetles, it is possible to classify the Chrysina beetles according to two major types of polarization responses connected to two different exocuticle structures.…”

Section: Introductionmentioning

confidence: 99%

“…Michelson noticed already in the early 1900s that light reflected from the scarab beetle Chrysina resplendens (Boucard, 1875) has a high degree of circular polarization [1]. Since then, a series of investigations has been performed in order to explain the structural origin of the color [2][3][4][5][6][7][8] and polarization properties [4,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] of these structures. Whether or not these beetles are able to detect polarized light has also been debated [24,25].…”

Section: Introductionmentioning

confidence: 99%

Polarizing properties and structure of the cuticle of scarab beetles from theChrysinagenus

2016

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The optical properties of several scarab beetles have been previously studied but few attempts have been made to compare beetles in the same genus. To determine whether there is any relation between specimens of the same genus, we have studied and classified seven species from the Chrysina genus. The polarization properties were analyzed with Mueller-matrix spectroscopic ellipsometry and the structural characteristics with optical microscopy and scanning electron microscopy. Most of the Chrysina beetles are green colored or have a metallic look (gold or silver). The results show that the green-colored beetles polarize reflected light mainly at off-specular angles. The gold-colored beetles polarize light left-handed near circular at specular reflection. The structure of the exoskeleton is a stack of layers that form a cusplike structure in the green beetles whereas the layers are parallel to the surface in the case of the gold-colored beetles. The beetle C. gloriosa is green with gold-colored stripes along the elytras and exhibits both types of effects. The results indicate that Chrysina beetles can be classified according to these two major polarization properties.

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Chirality-induced polarization effects in the cuticle of scarab beetles: 100 years after Michelson

Cited by 85 publications

References 34 publications

Refractive indices of chitin, chitosan, and uric acid with application to structural color analysis

Refractive indices of chitin, chitosan, and uric acid with application to structural color analysis

It's Not a Bug, It's a Feature: Functional Materials in Insects

Polarizing properties and structure of the cuticle of scarab beetles from theChrysinagenus

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