Highly Flexible, Stretchable, and Tunable Optical Diffusers with Mechanically Switchable Wettability Surfaces

Alqurashi, Tawfiq; Butt, Haider

doi:10.1021/acscentsci.9b00155

Cited by 18 publications

(15 citation statements)

References 36 publications

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“…The reversible hydrophobic surface characteristics allow the substrates used in many applications such as textile and sensors. In addition, highly stretchable and hydrophobic surfaces can open door for new approaches towards tunable photonic system design and self-cleaning applications 16 .…”

Section: Introductionmentioning

confidence: 99%

“…Altering the surface texture morphology influences the droplet pinning and its puddle on the surface while modifying the combination of the droplet rolling and sliding mechanisms on the surface. In addition, the wetting state of the stretchable surfaces were investigated previously 14–16 , the influence of the stretchable surface on the water droplet dynamics was left for further investigations. In the present study, the texture feature of the stretchable surface of hydrophobic characteristics is presented and the droplet movement on the stretchable surface is studied.…”

Section: Introductionmentioning

confidence: 99%

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Stretchable Hydrophobic Surfaces and Self-Cleaning Applications

Yilbaş

Hassan

Al‐Qahtani

et al. 2019

Sci Rep

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Hydrophobizing of stretchable elastomer surfaces is considered and the reversible behavior of the resulting surface wetting state is examined after stretching and relaxing the hydrophobized samples. The environmental dust are analyzed in terms of elemental constitutes and size, and the dust pinning on the hydrophobized surface is measured. The dust removal mechanisms, by the water droplets on the hydrophobized surface, are investigated. We demonstrated that deposition of functionalized nano-size silica units on the elastomer surface gives rise to hydrophobicity with 135° ± 3° contact angle and low hysteresis of 3° ± 1°. Stretching hydrophobized elastomer surface by 50% (length) reduces the contact angle to 122° ± 3° and enhances the hysteresis to 6° ± 1°. However, relaxing the stretched sample causes exchanging surface wetting state reversibly. Water droplet rolling and sliding can clean the dusty hydrophobized surface almost 95% (mass ratio of the dust particles removed). Droplet puddling causes striations like structures along the droplet path and close examination of the few residues of the dust reveals that the droplet takes away considerably large amount of dust from surface.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stretchable Hydrophobic Surfaces and Self-Cleaning Applications

Yilbaş

Hassan

Al‐Qahtani

et al. 2019

Sci Rep

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“…[23][24][25] Their main use is to spread light across a large solid angle, thereby minimizing or ideally removing glares or high-intensity bright spots. [26,27] A variety of optical diffusers based on different concepts have been developed and are commonly employed, among which are volume diffusers [28][29][30] like opal glass, microstructured surface diffusers [31][32][33][34][35] like ground glass, and holographic diffusers. [36][37][38][39] Volume diffusers based on Rayleigh scattering of deep-subwavelength scatterers provide an almost Lambertian light distribution, but at the cost of low energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

Toward Perfect Optical Diffusers: Dielectric Huygens’ Metasurfaces with Critical Positional Disorder

et al. 2021

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Conventional optical diffusers, such as thick volume scatterers (Rayleigh scattering) or microstructured surface scatterers (geometric scattering), lack the potential for on‐chip integration and are thus incompatible with next‐generation photonic devices. Dielectric Huygens’ metasurfaces, on the other hand, consist of 2D arrangements of resonant dielectric nanoparticles and therefore constitute a promising material platform for ultrathin and highly efficient photonic devices. When the nanoparticles are arranged in a random but statistically specific fashion, diffusers with exceptional properties are expected to come within reach. This work explores how dielectric Huygens’ metasurfaces can implement wavelength‐selective diffusers with negligible absorption losses and nearly Lambertian scattering profiles that are largely independent of the angle and polarization of incident waves. The combination of tailored positional disorder with a carefully balanced electric and magnetic response of the nanoparticles is shown to be an integral requirement for the operation as a diffuser. The proposed metasurfaces’ directional scattering performance is characterized both experimentally and numerically, and their usability in wavefront‐shaping applications is highlighted. Since the metasurfaces operate on the principles of Mie scattering and are embedded in a glassy environment, they may easily be incorporated in integrated photonic devices, fiber optics, or mechanically robust augmented reality displays.

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“…This interesting optics device is called tunable optical diffuser. Researchers have proposed some potential architectures, such as sinusoidal microwrinkles [ 12 ], polystyrene nanospheres/polydimethylsiloxane composite structures [ 13 ], hydrogel films [ 14 ], UV-cured polymer-dispersed liquid crystals [ 15 ] and cylindrical lenslet elastomers [ 16 ], to fabricate tunable optical diffusers for dealing with the deformation of photonic devices and controllably tuning the diffusion capability in advanced applications. A common feature of the fabricated diffusers mentioned above is the integration of a flexible elastomer with microstructures to alter the light path.…”

Section: Introductionmentioning

confidence: 99%

Tunable Optical Diffusers Based on the UV/Ozone-Assisted Self-Wrinkling of Thermal-Cured Polymer Films

Jiang

Tan

Peng

et al. 2021

Sensors

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Tunable optical diffusers have attracted attention because of the rapid development of next generation stretchable optoelectronics and optomechanics applications. Flexible wrinkle structures have the potential to change the light path and tune the diffusion capability, which is beneficial to fabricate optical diffusers. The generation of wrinkles usually depends on an external stimulus, thus resulting in complicated fabricating equipment and processes. In this study, a facile and low-cost method is proposed to fabricate wrinkle structures by the self-wrinkling of thermal-cured polymer for tunable optical diffusers. The uncured polydimethylsiloxane (PDMS) precursors were exposed to UV/ozone to obtain hard silica layers and then crosslinked via heating to induce the wrinkle patterns. The wrinkle structures were demonstrated as strain-dependent tunable optical diffusers and the optical diffusion of transmitted light via the deformable wrinkle structures was studied and adjusted. The incident light isotropically diffused through the sample at the initial state. When the wrinkle structures deformed, it showed a more pronounced isotropic optical diffusion with uniaxial tensile strain. The optical diffusion is anisotropical with a further increase in uniaxial tensile strain. The proposed method of fabricating wrinkles by UV/ozone-assisted self-wrinkling of thermal-cured polymer films is simple and cost-effective, and the obtained structures have potential applications in tunable optical diffusers.

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Highly Flexible, Stretchable, and Tunable Optical Diffusers with Mechanically Switchable Wettability Surfaces

Cited by 18 publications

References 36 publications

Stretchable Hydrophobic Surfaces and Self-Cleaning Applications

Stretchable Hydrophobic Surfaces and Self-Cleaning Applications

Toward Perfect Optical Diffusers: Dielectric Huygens’ Metasurfaces with Critical Positional Disorder

Tunable Optical Diffusers Based on the UV/Ozone-Assisted Self-Wrinkling of Thermal-Cured Polymer Films

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