Chirality in Rhomborhina Gigantea beetle

Ching, Suet Ying; Li, Gui Xin; Tam, Hoi Lam; Goh, David; Goh, Joseph K. L.; Cheah, Kok Wai

doi:10.1364/ome.4.002340

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…Helicoidal structures characterized by a constant pitch P o have been considered in literature [10] as well as arrangements with a small step in the pitch from some depth through the cuticle [11]. Our group has recently reported for Chrysina aurigans scarab beetles the presence of a pitch P that shows a smooth dependence with depth z through the cuticle [7]- [13], i.e.…”

Section: Introductionmentioning

confidence: 99%

Light Reflection by Cuticles of Chrysina Jewel Scarabs: Optical Measurements, Morphology Characterization, and Theoretical Modeling

Vargas¹,

Hernández-Jiménez²,

Libby³

et al. 2016

OPJ

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Cuticles of some Chrysina scarabs are characterized by flat, graded, and twisted structures of nanosized chitin fibrils. As inferred from SEM images, each species has its own spatial period or pitch P which is dependent on the depth z through the cuticle. From Berreman's formalism, taking into account the corresponding P(z) dependence, we evaluate reflection spectra of C. aurigans and C. chrysargyrea scarabs. The spectra display the main spectral features observed in the measured ones when small sections of the cuticles are illuminated with non-polarized light, for wavelengths between 300 and 1100 nm. By considering these twisted structures as 1D photonic crystals, an approach is developed to show how the broad band characterizing the reflection spectra arises from a narrow intrinsic photonic band width, whose spectral position moves through visible and near infrared wavelengths. The role of the epicuticle that covers the twisted structures is analyzed in terms of a waxy layer acting as an anti-reflecting coating that also shows low levels of light scattering.

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Section: Introductionmentioning

confidence: 99%

Light Reflection by Cuticles of Chrysina Jewel Scarabs: Optical Measurements, Morphology Characterization, and Theoretical Modeling

Vargas¹,

Hernández-Jiménez²,

Libby³

et al. 2016

OPJ

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“…The exoskeleton of the wings composed of multiple nanostructures shows that the intensity of reflections in TE and TM polarization was neither increased nor decreased with the angle of the incident light. Figure 4 shows the opposite trend in TE and TM modes of polarization with nonexistence of single dominant reflection peak, which further designate that optical reflector existing in the wings is complex multilayer structure (Ching et al, 2014).…”

Section: Polarization and Angle-dependent Reflection Measurementsmentioning

confidence: 93%

Role of Micro-Architectures on Insects' Elytra Affects the Nanomechanical and Optical Properties: Inspired for Designing the Lightweight Materials

Jyoti,

Tripathy

2023

JOPR

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The structural coloration of insects has received significant attention in the field of nanophotonic which has related properties with bio photonic crystals. The main focus in this study is on structural and mechanical features of wasp and beetle elytra such as Chrysidinae (is the specimen of parasitoid or kleptoparasitic wasp), Rhomborhina gigantea (RG is the specimen of bettle in the family of Cetoniidae) and chrysolina coerulans (CC is a species of beetle in the family Chrysomelidae) . The nanostructures present on the surface of elytra show the optical and deformable material properties. Surface morphology has been measured by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The depths of the hemispherical cavities present on the elytra have been analyzed using AFM. The optical and nanomechanical properties of the beetle elytra have also been studied. To measure the reflectivity in transverse electric (TE) and transverse magnetic (TM) mode, UV-visible spectroscopy has been used. The value of the average index of refraction is observed as 1.8 in all three species and the half-pitch of elytra’s varies from 0.139-0.136 μm in CC, 0.123-0.114 μm in Chrysidinae, and 0.154-0.161 μm in (RG). Nanoindentation was used to measure the modulus and hardness of the different beetle’s elytra. Higher value of elastic modulus (1.72 GPa) and hardness (0.89 GPa) in RG of elytra plays a significant role in resisting force. The photonic structure exhibits optical intrinsic color mixing properties which are used in the anticounterfeiting fields (currency and passport identification codes). The structural properties of beetle elytra would help to design the light-weight, high strength, anti coating sensor, color-changing micro air vehicles and novel optical materials.

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Investigation of the Variation of Near-Circular Polarization in Scarabaeoidea Beetles

Carter

Weir

McCall

2017

Materials Today: Proceedings

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Chirality in Rhomborhina Gigantea beetle

Cited by 5 publications

References 17 publications

Light Reflection by Cuticles of Chrysina Jewel Scarabs: Optical Measurements, Morphology Characterization, and Theoretical Modeling

Light Reflection by Cuticles of Chrysina Jewel Scarabs: Optical Measurements, Morphology Characterization, and Theoretical Modeling

Role of Micro-Architectures on Insects' Elytra Affects the Nanomechanical and Optical Properties: Inspired for Designing the Lightweight Materials

Investigation of the Variation of Near-Circular Polarization in Scarabaeoidea Beetles

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