Bending Induced Self-Organized Switchable Gratings on Polymeric Substrates

Parra-Barranco, Julian; Oliva-Ramirez, Manuel; González‐García, Lola; Alcaire, Maria; Macías-Montero, Manuel; Borrás, Ana; Frutos, F.; González‐Elipe, Agustín R.; Barranco, Ángel

doi:10.1021/am5037687

Cited by 17 publications

(21 citation statements)

References 32 publications

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“…Micro‐ and nanostructured soft surfaces offer a new strategy to dynamically tune optical properties by changing the surface topography without affecting the bulk properties . Recently, surface wrinkling has become a very cost‐effective, facile technology to reversibly control the surface topography, which inspired a wide range of applications such as thin‐film properties measurement, tunable adhesion and wettability, stretchable electronics, and optical materials/devices . Some more recently studies have demonstrated that surface wrinkling can also be used to prepare large‐area smart windows capable of controlling the light transmittance by means of micro‐ and nanopillar arrays on wrinkled elastomers, crumpling of metallic nanofilms, graphene films, and graphene oxide films on elastomeric substrates and silica nanoparticle‐embedded elastomer composite .…”

Section: Introductionmentioning

confidence: 99%

Harnessing Surface Wrinkling–Cracking Patterns for Tunable Optical Transmittance

Zhai

Wang

et al. 2017

Advanced Optical Materials

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to prepare, and some of them are chemically unstable during optical switching. [11] Furthermore, the assembly of these smart windows often suffers from complicated processes, high cost, and low efficiency. [1,3] Therefore, a convenient, cheap, and highly effective method is desirable for the fabrication of large-area smart windows with advanced functional features, such as large transmittance modulation, fast response time, and chemical stability suitable for long-term use without deteriorating optical performance.Micro-and nanostructured soft surfaces offer a new strategy to dynamically tune optical properties by changing the surface topography without affecting the bulk properties. [12][13][14][15][16][17][18][19] Recently, surface wrinkling [20][21][22] has become a very cost-effective, facile technology to reversibly control the surface topography, which inspired a wide range of applications such as thinfilm properties measurement, [23] tunable adhesion and wettability, [24] stretchable electronics, [25][26][27][28] and optical materials/ devices. [29][30][31][32][33][34][35][36][37][38] Some more recently studies have demonstrated that surface wrinkling can also be used to prepare large-area smart windows capable of controlling the light transmittance by means of micro-and nanopillar arrays on wrinkled elastomers, [12,13] crumpling of metallic nanofilms, [14] graphene films, [15] and graphene oxide films [16] on elastomeric substrates and silica nanoparticle-embedded elastomer composite. [17] It should be made clear that the light transmittance change mentioned in these studies is actually normal transmittance change, which was usually achieved by scattering the light rather than absorbing the light. Despite the clear advantages in material fabrication and stability, these methods still suffer from complicated fabrication processes, high cost, small transmittance modulation range, or potential material degradation. For example, smart windows achieved by micro-and nanopillar arrays on wrinkled elastomers [12,13] usually require multistep fabrication processes including template preparation, replica modeling, and surface wrinkling. Furthermore, these pillar arrays cannot be completely eliminated during the mechanical actuation which limits the achievable transmittance modulation range. For thin film/elastomer systems, [14][15][16] extremely large and more complicated biaxial prestrains (e.g., 400% for graphene oxide film/silicone rubber system [16] ) are usually required to realize very large surface topography change to enable large optical transmittance tuning. And also, the thin film materials are Optical devices with tunable specular optical transmittance have recently attracted great interest due to their wide range of applications. However, the reported methods of realizing tunable optical transmittance suffer from complex fabrication processes, high cost, unstable materials, or low tuning range. In this study, a simple, cheap, and highly effective approach to achieve large tuning range of optical transm...

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Section: Introductionmentioning

confidence: 99%

Harnessing Surface Wrinkling–Cracking Patterns for Tunable Optical Transmittance

Zhai

Wang

et al. 2017

Advanced Optical Materials

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“…The flat doublesided coated foil is transparent (central picture). The projected light reveals the pattern printed on the concave surface, whereas the pattern on the opposite convex surface remains invisible (left and right pictures)[507].…”

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confidence: 99%

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Barranco

Borrás

González‐Elipe

et al. 2016

Progress in Materials Science

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616

436

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a b s t r a c tThe oblique angle configuration has emerged as an invaluable tool for the deposition of nanostructured thin films. This review develops an up to date description of its principles, including the atomistic mechanisms governing film growth and nanostructuration possibilities, as well as a comprehensive description of the applications benefiting from its incorporation in actual devices. In contrast with other reviews on the subject, the electron beam assisted evaporation technique is analyzed along with other methods operating at oblique angles, including, among others, magnetron sputtering and pulsed laser or ion beam-assisted deposition techniques. To account for the existing differences between deposition in vacuum or in the presence of a plasma, mechanistic simulations are critically revised, discussing well-established paradigms such as the tangent or cosine rules, and proposing new models that explain the growth of tilted porous nanostructures. In the second part, we present an extensive description of applications wherein oblique-angle-deposited thin films are of relevance. From there, we proceed by considering the requirements of a large number of functional devices in which these films are currently being utilized (e.g., solar cells, Li batteries, electrochromic glasses, biomaterials, sensors, etc.), and subsequently describe how and why these nanostructured materials meet with these needs.

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“…One of the most common applications of optical diffusers is the backlighting system of the liquid crystal displays . More recently, emerging applications for optical diffusers such as smart windows and invisible labels have been demonstrated. In addition, light softening has found its way to optoelectronic devices such as solar cells, photodetectors, and light emitting diodes to enhance their power conversion efficiency, sensitivity, and brightness, respectively, through efficient photon management.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, polydimethylsiloxane (PDMS) is the material of first choice when it comes to flexible and tunable optical devices due to its superior optical transparency and mechanical properties. In particular, PDMS has recently attracted great attention for tunable optical diffusers and gratings . The proposed structures, however, require rather complicated and expensive fabrication processes including glancing angle deposition, surface wrinkling, E‐beam lithography and pattern transfer, and holographic lithography …”

Section: Introductionmentioning

confidence: 99%

Stretchable Hexagonal Diffraction Gratings as Optical Diffusers for In Situ Tunable Broadband Photon Management

Mahpeykar

Xiong

Wei

et al. 2016

Advanced Optical Materials

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A stretchable transmissive hexagonal diffraction grating, which has the potential to act as an optical diffuser, is demonstrated. Leveraging the simplicity of the self‐assembly fabrication process, the photon manipulation capability of polystyrene nanosphere arrays, and elastomeric properties of polydimethylsiloxane, the proposed device is capable of reproducible in situ tuning of both diffraction efficiency and spectral range. While being able to achieve maximum diffraction efficiencies of about 80%, the device displays highly efficient and broadband light diffusion fairly independent of incident light polarization and angle of incidence. Due to its efficient and tunable diffraction capabilities, one potential application of the reported device can be broadband photon management in solar cells and photodetectors by significant increase of the light path length inside the light‐absorbing thin films of these devices. As a proof of concept, the proposed optical diffuser is utilized for light absorption enhancement in colloidal quantum dot semiconductor thin films. The demonstrated devices enable integration of cheap and widely used materials with simple cost‐effective fabrication for photon management in optics, photonics, and optoelectronics.

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Bending Induced Self-Organized Switchable Gratings on Polymeric Substrates

Cited by 17 publications

References 32 publications

Harnessing Surface Wrinkling–Cracking Patterns for Tunable Optical Transmittance

Harnessing Surface Wrinkling–Cracking Patterns for Tunable Optical Transmittance

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Stretchable Hexagonal Diffraction Gratings as Optical Diffusers for In Situ Tunable Broadband Photon Management

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