Quantifying the saturation of structural colour from thin film polymeric photonic crystals

Rosetta, Giselle; Butters, Mike; Tomes, John; Little, Jay; Gunn, Matthew; Finlayson, Chris E.

doi:10.1117/12.2544198

Cited by 5 publications

(5 citation statements)

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“…The change in the ratio of the distribution sharpness to frequency was a clear indicator of the improving ordering, which has previously [29] been seen to correlate with increases in the full width half maximum of the structural color scattering cone. These results also suggest an exponential plateau on the angular width of the scattering cone with increasing numbers of shear passes applied as previously noted for polymer opals with visible structural color [29,30]. The cone with a 16.2 • width for 10 BIOS was broadened by 9.9 • for a further 10 BIOS passes, which was broadened by only 6.4 • for an additional 20 BIOS passes.…”

Section: Reflectance Characterizationsupporting

confidence: 83%

“…Fabrication of the thin films is discussed further in Section 3. Polymer opals displaying visible structural color have been characterized extensively [29][30][31][32][33], with the tunability of the structural color with sphere geometry and size being particularly well documented. However, we believe our work to be among the first reports of these systems being engineered toward the ultraviolet band of the electromagnetic spectrum, thus forming the primary focus of this paper.…”

Section: Introductionmentioning

confidence: 99%

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Transparent Polymer Opal Thin Films with Intense UV Structural Color

et al. 2022

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We report on shear-ordered polymer photonic crystals demonstrating intense structural color with a photonic bandgap at 270 nm. Our work examines this UV structural color, originating from a low refractive index contrast polymer composite system as a function of the viewing angle. We report extensive characterization of the angle-dependent nature of this color in the form of ‘scattering cones’, which showed strong reflectivity in the 275–315 nm range. The viewing range of the scattering was fully quantified for a number of planes and angles, and we additionally discuss the unique spectral anisotropy observed in these structures. Such films could serve as low-cost UV reflection coatings with applications in photovoltaics due to the fact of their non-photobleaching and robust mechanical behavior in addition to their favorable optical properties.

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Section: Reflectance Characterizationsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Transparent Polymer Opal Thin Films with Intense UV Structural Color

et al. 2022

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“…The end result is rubbery, free-standing films displayin intense structural color which changes with viewing angle and illumination, picture rightmost in Figure 1a. With the resulting peak wavelength of color appearanc dependent on the CIS particle diameter, this process has previously been tuned t engineer POs reflecting in the UV [33] through to red [21] and near-infrared part of th spectrum. Structural order is seen to iteratively improve and permeate into the films with further shear as the PS cores self-assemble within the PEA matrix.…”

Section: Thin Film Fabrication and Ordering Chracterizationmentioning

confidence: 99%

“…The structural color of POs has been extensively reported on previously [19][20][21][22][23]. However, this has been primarily in terms of the primary Bragg feature occurring from the periodicity of the {111} plane.…”

Section: Introductionmentioning

confidence: 99%

High-Angle Structural Color Scattering Features from Polymeric Photonic Structures

Rosetta

Tomes

Butters³

et al. 2023

Crystals

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Three-dimensional goniometric measurements of structural color from melt-sheared polymer nanoparticle composites is presented revealing high-angle features arising from Bragg scattering. These features are presented in terms of ‘scattering cones’ from full 180° hemispherical scans showing the spectroscopic and angular properties of these scattering spots. This work identifies the Miller indices of the photonic crystal planes responsible for these features and makes further observations as to the appearance of this scattering in the context of these structures as quasi-ordered systems. We probe structural color metrics such as peak wavelength and the tunability of reflectance intensities. As such, this report contributes towards an improved understanding of Bragg scattering and structural color from structures with inherent disorder. The complexity and specificity of color quality across the scattering hemisphere is an important consideration for practical uses such as in sensing applications, and we suggest that soft photonics, in particular, are strong candidates in high-angle color uses.

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“…This research demonstrates how it is possible to grow PO cores under a range of conditions with multiple routes to obtaining a given particle size. An overview of this is given in Table 3, where the time taken to obtain the core size need for the specified resultant color appearance as indicated by the literature is reported [66][67][68]. This is as determined from Figure 5, where these times are extrapolated from the exponential fit curves.…”

Section: Toward Polymer Opal Synthesis As a 'Dial-in' Techniquementioning

confidence: 99%

Dial-In Synthesis of ‘Polymer Opal’ Core–Interlayer–Shell Composite Nanoparticles

Rosetta,

Macaire,

Butters

et al. 2023

Polymers

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The emulsion polymerization process via which core–interlayer–shell polymer nanoparticles are synthesized is engineered to offer a crucial control of the eventual size and monodispersity of the polystyrene (PS) cores. We examine the role of key experimental parameters, optimizing the temperature, reactant purity, and agitation (stirring) rate. The subsequent addition of a poly(methyl-methacrylate) (PMMA) grafting layer and a poly(ethyl-acrylate) (PEA) shell layer produces composite particles, which are shear-orderable into opaline films, known as ‘polymer opals’. We, thus, demonstrate pathways toward a ‘dial-in’ process, where the time taken to obtain the target core size is mapped to the expected resultant structural color. At reaction temperatures of 60 and 70 °C, viable conditions are found where all syntheses give an excellent level of monodispersity (polydispersity index < 0.02), suitable for interlayer and shell growth. These reports may be readily applied to a wider industrial scale fabrication pipeline for these polymeric photonic materials.

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Quantifying the saturation of structural colour from thin film polymeric photonic crystals

Cited by 5 publications

References 0 publications

Transparent Polymer Opal Thin Films with Intense UV Structural Color

Transparent Polymer Opal Thin Films with Intense UV Structural Color

High-Angle Structural Color Scattering Features from Polymeric Photonic Structures

Dial-In Synthesis of ‘Polymer Opal’ Core–Interlayer–Shell Composite Nanoparticles

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