High-throughput reproduction of the Morpho butterfly's specific high contrast blue

Saitô, Akira; Murase, Junichi; Yonezawa, Masaru; Watanabe, Hiroyuki; Shibuya, Takuto; Sasaki, Mitsuo; Ninomiya, Takafumi; Noguchi, Shunji; Akai‐Kasaya, Megumi; Kuwahara, Yuji

doi:10.1117/12.915255

Cited by 15 publications

(18 citation statements)

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“…The optical setup [19] schematically drawn in Fig. 4(b)) is used to detect the reflective properties of all structures in more detail.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…Kinoshita et al explained the blue coloring of Morpho butterflies by the combination of interference and diffraction of light from ridges with irregular height differences in the sub-wavelength range in combination with pigmentation [17,18]. Employing the same hypothesis, Saito et al [7,19] and Chung et al [20] used multilayer deposition of TiO 2 /SiO 2 on an irregular support to successfully mimic the wide angular reflectance of the blue color artificially. Recently, however, Chung et al [21] found that chitin/air multilayers provide larger color gamut and better color stability against random structural variations than multilayers based on typical inorganic materials.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical and experimental analysis of the structural pattern responsible for the iridescence of Morpho butterflies

et al. 2013

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Abstract:Morpho butterflies are well-known for their iridescence originating from nanostructures in the scales of their wings. These optical active structures integrate three design principles leading to the wide angle reflection: alternating lamellae layers, "Christmas tree" like shape, and offsets between neighboring ridges. We study their individual effects rigorously by 2D FEM simulations of the nanostructures of the Morpho sulkowskyi butterfly and show how the reflection spectrum can be controlled by the design of the nanostructures. The width of the spectrum is broad (≈ 90 nm) for alternating lamellae layers (or "brunches") of the structure while the "Christmas tree" pattern together with a height offset between neighboring ridges reduces the directionality of the reflectance. Furthermore, we fabricated the simulated structures by e-beam lithography. The resulting samples mimicked all important optical features of the original Morpho butterfly scales and feature the intense blue iridescence with a wide angular range of reflection.

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“…The optical setup [19] schematically drawn in Fig. 4(b)) is used to detect the reflective properties of all structures in more detail.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental analysis of the structural pattern responsible for the iridescence of Morpho butterflies

et al. 2013

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“…For the same reflection peak other fabricated Morpho inspired multilayer replicas [41,42] made from TiO 2 (n ≈ 2.6) and SiO 2 (n ≈ 1.5) had a higher bandwidth of 145 nm. As a lower ∆n/n, i.e., bandwidth is important for a larger color gamut and better color stability of the structural colors [43] our fabrication technique exhibits competitive optical properties.…”

Section: Optical Characterization and Discussionmentioning

confidence: 99%

“…Therefore, a trade off between achieving non-iridescent reflection and getting higher aspect ratio has to be maintained. Moreover, surface randomization [28,41,42] which also plays a key role in Morpho inspired structural colors can be included as well in this design. Combining secondary surface diffuser (aperiodic microstructure by multiwave exposure) [20] with our current technique, almost perfect Morpho type 'Christmas tree' structures might be manufactured.…”

Section: Discussionmentioning

confidence: 99%

Fabrication of hierarchical photonic nanostructures inspired by Morpho butterflies utilizing laser interference lithography

Siddique

Hünig

Faisal

et al. 2015

Opt. Mater. Express

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Abstract:We introduce laser interference lithography (LIL) as a tool to fabricate hierarchical photonic nanostructures inspired by blue Morpho butterflies. For that, we utilize the interference pattern in vertical direction in addition to the conventional horizontal one. The vertical interference creates the lamellae by exploiting the back reflection from the substrate. The horizontal interference patterns the ridges of the hierarchical Christmas tree like structure. The artificial Morpho replica produced with this technique feature a brilliant blue iridescence up to an incident angle of 40 • .

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“…However, iridescence can be avoided or reduced by properly engineering the physical structure responsible for the structural color. Saito et al have nanoimprinted surfaces displaying the Morpho-blue color without iridescence 41 . Another example is furnished by multilayer polymer mirrors comprising alternating layers of the unirefringent poly(methyl methacrylate) and some birefringent polyester 42 .…”

Section: Structural Colormentioning

confidence: 99%

Towards biomimetic red solar cells

Lenau

Ahmad

Lakhtakia

2019

Bioinspiration, Biomimetics, and Bioreplication IX

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Silicon photovoltaic solar cells generally have a black or blue appearance that makes them aesthetically very different from traditional red roofs that either comprise burned-clay tiles or composite-material shingles. Rooftop solar cells may become more acceptable if they are similar in appearance to traditional roofs. This objective requires that the red part (620-700 nm wavelength) of the incoming solar spectrum be reflected so that it becomes unavailable for photovoltaic generation of electricity. Complete reflection of red photons would result in the reduction of useful solar photons (300-1200 nm wavelength) by 12.5%. Calculations show that the optical short-circuit density will then decline by: 17% for 100-µm-thick crystalline-silicon solar cells, 20-22% for triple-junction tandem thin-film solar cells of amorphous silicon, 15-16% for 2.2-µm-thick CIGS solar cells, and 16-20% for ultrathin CIGS solar cells. On average, the efficiency of a typical solar cell will have to be multiplied by a factor of 0.8 if all red photons were reflected. This reduction in efficiency can be offset by wider adoption of rooftop solar cells. Red-rejection filters can be made of particulate composite materials containing, say, silica nanospheres. Typically, the solar cells will be iridescent then, which may not be aesthetically pleasing to many. Non-iridescent red-rejection filters can be fabricated by upscaling the linear dimensions of biomimetic filters nano-imprinted to reproduce the Morpho blue, this possibility being guaranteed by the scale invariance of the Maxwell equations and the weak dispersion of the refractive indexes of numerous polymers in the visible spectral regime. Non-uniformly red rooftop solar cells would also become feasible.

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High-throughput reproduction of the Morpho butterfly's specific high contrast blue

Cited by 15 publications

References 0 publications

Theoretical and experimental analysis of the structural pattern responsible for the iridescence of Morpho butterflies

Theoretical and experimental analysis of the structural pattern responsible for the iridescence of Morpho butterflies

Fabrication of hierarchical photonic nanostructures inspired by Morpho butterflies utilizing laser interference lithography

Towards biomimetic red solar cells

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