Absence of Circular Polarisation in Reflections of Butterfly Wing Scales with Chiral Gyroid Structure

Saba, Matthias; Wilts, Bodo D.; Hielscher, Johannes; Schröder‐Turk, Gerd E.

doi:10.1016/j.matpr.2014.09.023

Cited by 67 publications

(89 citation statements)

References 71 publications

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“…Given the biological precedence of circular polarization-sensitive vision [mantis shrimp (15)] and the range of strongly circularly polarizing biological materials (16)(17)(18)(19) (based on Bouligand structures reminiscent of cholesteric liquid crystal phases), circular polarization effects in the butterfly wing scales would seem to be a possibility, but direct measurements of macroscopic reflections fail to detect a circular polarization signal (12,20).…”

Section: Significancementioning

confidence: 99%

“…In light of their role for circular polarization effects, it has been questioned by Saranathan et al (6), Mille et al (21), and Saba et al (12) whether both single-gyroid enantiomers occur within the wing scales of C. rubi (racemic mixtures with equal proportions of RH and LH enantiomers would clearly annihilate any circular polarization signal). Saranathan et al (6) proposed the existence of both chiralities from SEM images of the scale surface.…”

Section: Significancementioning

confidence: 99%

“…It is an essential determinant of color uniformity, because the photonic properties of the single gyroid strongly depend on the crystal orientation (12,23). Yoshioka et al (9) observed a highly textured crystal orientation within scales of the butterfly Parides sesostris.…”

Section: Significancementioning

confidence: 99%

“…The enantiomer displayed in figure 2 in ref. 12 is LH.] The chirality of the single gyroid is complicated by the presence of the distinct screw axis of opposite handedness (12).…”

mentioning

confidence: 99%

“…12 is LH.] The chirality of the single gyroid is complicated by the presence of the distinct screw axis of opposite handedness (12). Our results provide a clear indication that nature's morphogenesis of this complex nanostructure exerts control over secondary features of the formed complex nanostructure, leading to specific enantiomeric form and specific crystallographic texture (meaning the occurrence of preferential crystal orientation of the micrometersized gyroid domains with regard to the wing scale surface).…”

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confidence: 99%

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Coexistence of both gyroid chiralities in individual butterfly wing scales of Callophrys rubi

Winter

Butz

Dieker

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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The wing scales of the Green Hairstreak butterfly Callophrys rubi consist of crystalline domains with sizes of a few micrometers, which exhibit a congenitally handed porous chitin microstructure identified as the chiral triply periodic single-gyroid structure. Here, the chirality and crystallographic texture of these domains are investigated by means of electron tomography. The tomograms unambiguously reveal the coexistence of the two enantiomeric forms of opposite handedness: the left-and right-handed gyroids. These two enantiomers appear with nonequal probabilities, implying that molecularly chiral constituents of the biological formation process presumably invoke a chiral symmetry break, resulting in a preferred enantiomeric form of the gyroid structure. Assuming validity of the formation model proposed by Ghiradella H (1989) J Morphol 202(1): 69-88 and Saranathan V, et al. (2010) Proc Natl Acad Sci USA 107(26):11676-11681, where the two enantiomeric labyrinthine domains of the gyroid are connected to the extracellular and intra-SER spaces, our findings imply that the structural chirality of the single gyroid is, however, not caused by the molecular chirality of chitin. Furthermore, the wing scales are found to be highly textured, with a substantial fraction of domains exhibiting the <001> directions of the gyroid crystal aligned parallel to the scale surface normal. Both findings are needed to completely understand the photonic purpose of the single gyroid in gyroid-forming butterflies. More importantly, they show the level of control that morphogenesis exerts over secondary features of biological nanostructures, such as chirality or crystallographic texture, providing inspiration for biomimetic replication strategies for synthetic self-assembly mechanisms.electron tomography | chirality | crystallographic texture | photonic crystal | butterfly wing scales A lthough the formation of chiral structures is fascinating, their occurrence can often be rationalized by simple energy or free energy considerations without a need to resort to their possible biological origin. For example, handed structures are observed in the simplest models of phyllotaxis (1) and self-assembly of biological fibers (2). In such models, there is no energetic distinction between and hence, a balance of the two enantiomers [that is, the right-handed (RH) and left-handed (LH) versions of the chiral structure]. Chiral symmetry breaking, the process by which one enantiomer occurs exclusively or with prevalence, is commonly observed in biological materials on a range of scales from molecular dimensions and the structure of DNA to the macroscopic size of snails (3). The dominance of one enantiomer is driven by the presence of a force or molecular building block that favors one enantiomer over the other; constituent chiral molecules (4), genetically controlled molecular pathways (3), and biological generation of torque (5) are possible causes.Here, we investigate the chiral symmetry breaking of the singlegyroid structure, a complex network-lik...

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Section: Significancementioning

confidence: 99%

Section: Significancementioning

confidence: 99%

Section: Significancementioning

confidence: 99%

“…The enantiomer displayed in figure 2 in ref. 12 is LH.] The chirality of the single gyroid is complicated by the presence of the distinct screw axis of opposite handedness (12).…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Coexistence of both gyroid chiralities in individual butterfly wing scales of Callophrys rubi

Winter

Butz

Dieker

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Chiral Mesoporous Silica Materials

Cao

Che

2017

Chiral Nanomaterials: Preparation, Properties and Applications

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Biopolymer Photonics: From Nature to Nanotechnology

Vogler‐Neuling,

Saba,

Gunkel

et al. 2023

Adv Funct Materials

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Biopolymers offer vast potential for renewable and sustainable devices. While nature mastered the use of biopolymers to create highly complex 3D structures and optimized their photonic response, artificially created structures still lack nature's diversity. To bridge this gap between natural and engineered biophotonic structures, fundamental questions such as the natural formation process and the interplay of structural order and disorder must be answered. Herein, biological photonic structures and their characterization techniques are reviewed, focusing on those structures not yet artificially manufactured. Then, employed and potential nanofabrication strategies for biomimetic, bio‐templated, and artificially created biopolymeric photonic structures are discussed. The discussion is extended to responsive biopolymer photonic structures and hybrid structures. Last, future fundamental physics, chemistry, and nanotechnology challenges related to biopolymer photonics are foreseen.

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Absence of Circular Polarisation in Reflections of Butterfly Wing Scales with Chiral Gyroid Structure

Cited by 67 publications

References 71 publications

Coexistence of both gyroid chiralities in individual butterfly wing scales of Callophrys rubi

Coexistence of both gyroid chiralities in individual butterfly wing scales of Callophrys rubi

Chiral Mesoporous Silica Materials

Biopolymer Photonics: From Nature to Nanotechnology

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