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Structure, Function, and Self-Assembly of Single Network Gyroid (I4132) Photonic Crystals in Butterfly Wing Scales

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Structure, Function, and Self-Assembly of Single Network Gyroid (I4132) Photonic Crystals in Butterfly Wing Scales Structure, function, and self-assembly of single network gyroid (I4132) photonic crystals in butterfly wing scales Vinodkumar Saranathana,b, Chinedum O. Osujib,c,d, Simon G. J. Mochrieb,d,e, Heeso Nohb,d, Suresh Narayananf, Alec Sandyf, Eric R. Dufresneb,d,e,g, and Richard O. Pruma,b,1 aDepartment of Ecology and Evolutionary Biology, and Peabody Museum of Natural History, bCenter for Research on Interface Structures and Phenomena, cDepartment of Chemical Engineering, dSchool of Engineering and Applied Science, and eDepartment of Physics, Yale University, New Haven, CT 06511; fAdvanced Photon Source, Argonne National Laboratory, Argonne, IL 60439; and gDepartment of Mechanical Engineering, Yale University, New Haven, CT 06511 Edited by Anthony Leggett, University of Illinois at Urbana-Champaign, Urbana, IL, and approved May 11, 2010 (received for review August 23, 2009) Complex three-dimensional biophotonic nanostructures produce A precise characterization of color-producing biological na- the vivid structural colors of many butterfly wing scales, but their nostructures is critical to understanding their optical function and exact nanoscale organization is uncertain. We used small angle development. Structural and developmental knowledge of bio- X-ray scattering (SAXS) on single scales to characterize the 3D photonic materials could also be used in the design and manu- photonic nanostructures of five butterfly species from two families facture of biomimetic devices that exploit similar physical (Papilionidae, Lycaenidae). We identify these chitin and air nanos- mechanisms of color production (4, 12, 13). After millions of I tructures as single network gyroid ( 4132) photonic crystals. We years of selection for a consistent optical function, photonic crys- describe their optical function from SAXS data and photonic tals in butterfly wing scales are an ideal source to inspire biomi- band-gap modeling. Butterflies apparently grow these gyroid metic technology. Indeed, their optical properties have at times nanostructures by exploiting the self-organizing physical dynamics surpassed those of engineered solutions (4, 14). SCIENCES of biological lipid-bilayer membranes. These butterfly photonic The three-dimensional crystalline complexity of papilionid and nanostructures initially develop within scale cells as a core-shell lycaenid butterfly scales has been appreciated since the 1970s APPLIED PHYSICAL double gyroid (Ia3d), as seen in block-copolymer systems, with a (8, 11, 15–24). However, most studies have used 2D electron mi- pentacontinuous volume comprised of extracellular space, cell croscopy (EM) to characterize these 3D photonic nanostructures, plasma membrane, cellular cytoplasm, smooth endoplasmic reti- which is not sufficient to completely resolve their mesoscale fea- culum (SER) membrane, and intra-SER lumen. This double gyroid tures. These structures have been variously characterized as sim- nanostructure is subsequently transformed into a single gyroid ple cubic (SC) (17), face-centered cubic (FCC) (16), or FCC network through the deposition of chitin in the extracellular space inverse opal (22, 24) orderings of air spheres in chitin. Recently, EVOLUTION and the degeneration of the rest of the cell. The butterflies develop Michielsen and Stavenga (18) reported qualitative pattern match- the thermodynamically favored double gyroid precursors as a ing between published transmission electron microscope (TEM) route to the optically more efficient single gyroid nanostructures. images of various papilionid and lycaenid structurally colored Current approaches to photonic crystal engineering also aim to wing scales and simulated sections of level set gyroid computer produce single gyroid motifs. The biologically derived photonic models. Michielsen and Stavenga (18) stated that additional com- nanostructures characterized here may offer a convenient tem- parisons of the butterfly nanostructures to computer models of plate for producing optical devices based on biomimicry or direct primitive cubic (P) and diamond (D) structures “immediately dielectric infiltration. suggest” a best fit with the gyroid structure, but they did not present these results nor any quantitative measure of the matches biological meta-materials ∣ organismal color ∣ biomimetics ∣ to alternative cubic symmetry space groups (P, D, G). More re- biological cubic mesophases cently, Michielsen et al. (20) provided further support for their identification of the gyroid nanostructure in Callophrys rubi rganismal structural colors are produced by physical inter- (Lycaenidae) by showing congruence between a finite difference Oactions of light with biomaterials having nanostructural vari- time domain model of light scattering by a single gyroid structure ation in the refractive index on the order of visible wavelengths and single scale reflectance measurements. Argyros et al. (23) (1–6). Structural colors form an important aspect of the pheno- used tilt-series electron tomography to model the nanostructure type of butterflies (4, 5, 7, 8) and are frequently used in inter- of Teinopalpus imperialis (Papilionidae) and concluded that it was sexual signaling (7), aposematic communication, etc. Structurally a distorted, chiral, tetrahedral structure with an underlying tricli- colored butterfly scales are extremely diverse in nanostructure nic lattice. Poladian et al. (19) and Michielsen and Stavenga (18) and in optical function (4, 6, 8, 9). However, the structural colors respectively suggest a distorted diamond and gyroid morphology of certain papilionid and lycaenid butterflies are produced by for T. imperialis. Although electron tomography may be promis- genuine three-dimensional biological photonic crystals com- ing, sample shrinkage and other artifacts may alter the nano- prised of a complex network of the dielectric cuticular chitin (re- structure and its three-dimensional connectivity (23, 25). Thus, fractive index, n ¼ 1.56 þ i0.06) (10) and air in the cover scales of the wing (8, 9) (Fig. 1 and Fig. S1). The dorsal surface of the Author contributions: V.S., C.O.O., S.G.J.M., H.N., S.N., A.S., E.R.D., and R.O.P. designed scales consists of a network of parallel, longitudinal ridges joined research; V.S., H.N., and R.O.P. performed research; V.S., C.O.O., S.G.J.M., H.N., E.R.D., together by slender, spaced cross-ribs that together form windows and R.O.P. analyzed data; and V.S.and R.O.P. wrote the paper. into the interior of the scale (Fig. 1 B and E and Fig. S1 B, E, The authors declare no conflict of interest. and H). The photonic crystals reside inside the body of the wing This article is a PNAS Direct Submission. scales as either disjoint crystallites (Fig. 1B and Fig. S1 E and H) 1To whom correspondence may be addressed. E-mail: [email protected]. or as a single slab of fused photonic crystal domains (4, 8, 9, 11) This article contains supporting information online at www.pnas.org/lookup/suppl/ (Fig. 1E and Fig. S1B). doi:10.1073/pnas.0909616107/-/DCSupplemental. www.pnas.org/cgi/doi/10.1073/pnas.0909616107 PNAS Early Edition ∣ 1of6 Downloaded by guest on September 26, 2021 Fig. 1. Anatomy of the structural color-producing nanostructure in lycaenid and papilionid butterflies. (A) Light micrograph of the ventral wing cover scales of Callophrys (formerly Mitoura) gryneus (Lycaenidae). The opalescent highlights are produced by randomly oriented crystallite domains. (Scale bar: 100 μm.) (B) SEM image of the dorsal surface of a C. gryneus scale showing disjoint crystallites beneath windows created by a network of parallel, longitudinal ridges and slender, spaced cross-ribs. (Inset) Simulated SEM (111) projection from a thick slab of a level set single gyroid nanostructure. (Scale bar: 2.5 μm.) (C) TEM image of the C. gryneus nanostructure showing a distinctive motif, uniquely characteristic of the (310) plane of the gyroid morphology. (Inset) A matching simulated (310) TEM section of a level set single gyroid model. (Scale bar: 200 nm.) (D) Light micrograph of the dorsal wing cover scales of the Parides sesostris (Papilionidae). (Scale bar: 100 μm.) (E) SEM image of the lateral surface of the wing scale nanostructure of P. sesostris showing fused polycrystalline domains beneath columnar windows created by a network of ridges and spaced cross-ribs. The fractured face features a square lattice of air holes in chitin. (Inset) Simulated SEM (100) projection from a thick slab of a level set single gyroid nanostructure. (Scale bar: 2 μm.) (F) TEM image of the P. sesostris nanostructure showing a distinctive motif, uniquely characteristic of the (211) plane of the gyroid morphology. (Inset) A matching simulated (211) TEM section of a level set single gyroid model. (Scale bar: 2 μm.) c, chitin; a, air void. fundamental uncertainty remains about the precise nanoscale space groups such as simple primitive (Pm3m) or single diamond organization of 3D photonic crystals in butterfly wing scales. (Fd3m), as well (Fig. S3). After normalizingp theffiffiffi fundamental Synchrotron small angle X-ray scattering (SAXS) is an ideal 2 peak to one, the conspicuousp absenceffiffiffi of the reflection and tool to investigate surface and bulk structural correlations of 7 artificially engineered photonic crystals (26). However, SAXS the presence of the forbidden peak do not support the assign- has only recently (27) been applied to characterize natural photo- ment of the simple primitive (Pm3m) spacepffiffiffi group (Fig. S3). Upon 3 nic materials with mesoscale (150–350 nm) scattering features, normalizing
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