Size-effect of oligomeric cholesteric liquid-crystal microlenses on the optical specifications

Bayon, Chloé; Agez, Gonzague; Mitov, Michel

doi:10.1364/ol.40.004763

Cited by 13 publications

(15 citation statements)

References 17 publications

(20 reference statements)

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“…Chemical information may be added to thermoregulation and optical information by taking into account the wax layer (the outermost part of insect cuticles is very often covered with wax). The Polygonal texture as found in the cuticle of C. gloriosa is not similar to polygonal textures as displayed in synthetic CLCs [25][26][27]: the patterns are not structurally and optically analogous to the focal conic domains formed spontaneously on the free surface of a synthetic cholesteric film [28]. The cuticle has concave cells whereas the artificial films have convex cells.…”

Section: Smart Light Modulators In the Cuticle Of Chrysina Gloriosamentioning

confidence: 73%

Multifunctional reflectors in the carapace of scarab beetles

Mitov

2018

Liquid Crystals XXII

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The carapace of insects can generate optical information with vivid structural colors, which may be of paramount importance in the life and the evolution of most day-living animals. A cholesteric liquid crystal organization of chitin fibrils is recurrently at the origin of optical properties. We summarize some recent results on the carapace of scarab beetles with possible functions related to optical information and thermoregulation. In the case of Chrysina gloriosa, green bands include wavelength-selective micromirrors and silver stripes play the role of flat metallic reflector operating over the visible spectrum and into the NIR-IR spectrum. Bio-inspired materials might address broadband reflectors for energy savings, stealthiness, cryptography or wavelength-specific light modulators in routing technologies.

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Section: Smart Light Modulators In the Cuticle Of Chrysina Gloriosamentioning

confidence: 73%

Multifunctional reflectors in the carapace of scarab beetles

Mitov

2018

Liquid Crystals XXII

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“…In the mid-1990s, polygonal textures in the film plane and in cross sections were observed via TEM 48 and AFM 49,50 . In the 2010s, investigations of polygonal textures focused on glass-forming oligomers [51][52][53][54][55][56][57] such as those used in the present study, which does not focus on the polygonal texture itself.…”

Section: Resultsmentioning

confidence: 99%

Biomimetic design of iridescent insect cuticles with tailored, self-organized cholesteric patterns

2020

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Replicating biological patterns is promising for designing materials with multifaceted properties. Twisted cholesteric liquid crystal patterns are found in the iridescent tessellated cuticles of many insects and a few fruits. Their accurate replication is extremely difficult since discontinuous patterns and colors must coexist in a single layer without discontinuity of the structures. Here, a solution is demonstrated by addressing striped insect cuticles with a complex twisted organization. Geometric constraints are met by controlling the thermal diffusion in a cholesteric oligomer bilayer subjected to local changes in the molecular anchoring conditions. A multicriterion comparison reveals a very high level of biomimicry. Proof-of-concept prototypes of anti-counterfeiting tags are presented. The present design involves an economy of resources and a high versatility of chiral patterns unreached by the current manufacturing techniques such as metallic layer vacuum deposition, template embossing and various forms of lithography which are limited and often prohibitively expensive.

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“…Micromirrors are used in optical devices, tunable lasers 3 , televisions, hard disk storage, projectors, imaging technologies 4 and MEMS technology for medical applications 5 or optical bio-imaging 6 . The purpose of the present investigation is to provide a comparison of optical behaviors and structures from microlenses found in synthetic cholesteric liquid crystal (CLC) oligomer films 7,8 to cholesteric micro-mirrors in the cuticle (outer carapace) of the beetle Chrysina gloriosa (C. gloriosa) 9 .…”

Section: Introductionmentioning

confidence: 99%

Cholesteric microlenses and micromirrors in the beetle cuticle and in synthetic oligomer films: a comparative study

Agez

Bayon

Mitov

2017

Emerging Liquid Crystal Technologies XII

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Size-effect of oligomeric cholesteric liquid-crystal microlenses on the optical specifications

Abstract: To cite this version:Chloé Bayon, Gonzague Agez, Michel Mitov. Size-effect of oligomeric cholesteric liquid-crystal microlenses on the optical specifications.

Cited by 13 publications

References 17 publications

Multifunctional reflectors in the carapace of scarab beetles

Multifunctional reflectors in the carapace of scarab beetles

Biomimetic design of iridescent insect cuticles with tailored, self-organized cholesteric patterns

Cholesteric microlenses and micromirrors in the beetle cuticle and in synthetic oligomer films: a comparative study

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