Giant birefringent optics in multilayer polymer filters

Gilbert, Larry; Weber, M.; Strharsky, R.J.; Stover, C.A.; Nevitt, Timothy J.; Ouderkirk, A. J.

doi:10.1364/oic.2001.fa2

Cited by 3 publications

(5 citation statements)

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“…Interfacial drawing provides an opportunity for producing large-area multilayer polymer thin films processed from the same (or similar) solvents, which could enable the fabrication of new architectures for OLEDs, organic solar cells, and reflective birefringent optics . Additionally, the ability of interfacial drawing to coat uniform, ultrathin (10–20 nm) polymer films (which is often difficult to achieve with other coating techniques) would be beneficial to a number of fields, including sensors, antireflection coatings, and biomedical devices .…”

Section: Introductionmentioning

confidence: 99%

Interfacial Drawing: Roll-to-Roll Coating of Semiconducting Polymer and Barrier Films onto Plastic Foils and Textiles

et al. 2019

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This paper demonstrates that a thin polymeric film (10−80 nm) can be continuously drawn from the meniscus of a nonpolar polymer solution at an air−water−fluoropolymer interface using a roll-to-roll process: "interfacial drawing". With this process, it is possible to control the thickness of the film by manipulating the concentration of the solution, along with the drawing velocity of the receiving substrate. We demonstrate the formation of thin films >1 m in length and 1000 cm 2 in area, using our custom-designed apparatus. Interfacial drawing has three characteristics which compare favorably to other methods of forming and depositing polymeric thin films. First, the films are solidified prior to deposition, which means that they can be used to uniformly coat nonplanar, rough, or porous substrates. Second, these films can be stacked into multilayered architectures without risk of redissolving the layer beneath. Third, for some materials, the process yields films with superior mechanical compliance for applications such as wearable or flexible devices, compared to films produced by spin-coating. We demonstrate the utility of interfacial drawing by forming thin films of various semiconducting polymers, including the active layers of all-polymer bulk heterojunction solar cells as well as barrier coatings. As part of these demonstrations, we show how floating polymeric films can be transferred easily to diverse substrates, including those with rough and irregular surfaces, such as textiles and fabrics.

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Section: Introductionmentioning

confidence: 99%

Interfacial Drawing: Roll-to-Roll Coating of Semiconducting Polymer and Barrier Films onto Plastic Foils and Textiles

et al. 2019

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“…When the numerical aperture (NA) increased (from 0 to 0.8), the transmittance trend noticeably decreased (510 to 580 nm). Angular-sensitive transmittance from the multiple interference effect 81 , 82 allowed high-frequency pass and edge enhancement at 510 nm. The nanoslide alternatively functioned as a low-frequency-pass filter and bright-field imaging because the multilayer stack had wavelength sensitivity 83 , causing a decrease in transmittance as the incident angle increased to 580 nm.…”

Section: Hydrogel-based Photonic Devicesmentioning

confidence: 99%

Hydrogels for active photonics

Ko,

Jeon,

Kim

et al. 2024

Microsyst Nanoeng

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Conventional photonic devices exhibit static optical properties that are design-dependent, including the material’s refractive index and geometrical parameters. However, they still possess attractive optical responses for applications and are already exploited in devices across various fields. Hydrogel photonics has emerged as a promising solution in the field of active photonics by providing primarily deformable geometric parameters in response to external stimuli. Over the past few years, various studies have been undertaken to attain stimuli-responsive photonic devices with tunable optical properties. Herein, we focus on the recent advancements in hydrogel-based photonics and micro/nanofabrication techniques for hydrogels. In particular, fabrication techniques for hydrogel photonic devices are categorized into film growth, photolithography (PL), electron-beam lithography (EBL), and nanoimprint lithography (NIL). Furthermore, we provide insights into future directions and prospects for deformable hydrogel photonics, along with their potential practical applications.

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“…Photonic interference effects can also be utilized for sharp angular selectivity [75]. A useful step in adjusting spectral and angular response is for one layer or both in the pair to be anisotropic and also to grade the thickness of the pair across the stack [76]. Coatings of aligned, anisotropic nanoparticles have been shown to have potential too [77], but cost-effective fabrication routes for this type of geometry have yet to be demonstrated.…”

Section: Anisotropic Nanocomposites For Angular and Polarization Selementioning

confidence: 99%

“…A remarkable feature in such stacks is the ability to have almost constant spectral response out to very high angles of incidence ( Figure 8). This is achieved by controlled variation of the thickness of each polymer pair from substrate to surface [76]. A similar effect was used in an all-inorganic pair stack used recently to confine transmittance to one incident angle [75].…”

Section: All-dielectric Spectrally Selective Absorbers and Mirrorsmentioning

confidence: 99%

“…Inspiration can be drawn from our supercool roof coating made with many thickness-graded polyester pairs: an all-polymer multilayer [76,89] could also be used to make supercool fabrics, which reflect the nonvisible 50% of incident solar energy while retaining color and sky window selective IR properties. These polyester nanosheets and fibers would also produce a strong signal at those wavelengths where thermal imaging camera arrays sense, and could thus be used to help locate people or places as needed at night (e.g.…”

Section: Fabrics and Wearablesmentioning

confidence: 99%

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Nanophotonics-enabled smart windows, buildings and wearables

Smith¹,

Gentle²,

Arnold³

et al. 2016

Nanophotonics

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Design and production of spectrally smart windows, walls, roofs and fabrics has a long history, which includes early examples of applied nanophotonics. Evolving nanoscience has a special role to play as it provides the means to improve the functionality of these everyday materials. Improvement in the quality of human experience in any location at any time of year is the goal. Energy savings, thermal and visual comfort indoors and outdoors, visual experience, air quality and better health are all made possible by materials, whose "smartness" is aimed at designed responses to environmental energy flows. The spectral and angle of incidence responses of these nanomaterials must thus take account of the spectral and directional aspects of solar energy and of atmospheric thermal radiation plus the visible and color sensitivity of the human eye. The structures required may use resonant absorption, multilayer stacks, optical anisotropy and scattering to achieve their functionality. These structures are, in turn, constructed out of particles, columns, ultrathin layers, voids, wires, pure and doped oxides, metals, polymers or transparent conductors (TCs). The need to cater for wavelengths stretching from 0.3 to 35 µm including ultraviolet-visible, near-infrared (IR) and thermal or Planck radiation, with a spectrally and directionally complex atmosphere, and both being dynamic, means that hierarchical and graded nanostructures often feature. Nature has evolved to deal with the same energy flows, so biomimicry is sometimes a useful guide.

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Giant birefringent optics in multilayer polymer filters

Cited by 3 publications

References 0 publications

Interfacial Drawing: Roll-to-Roll Coating of Semiconducting Polymer and Barrier Films onto Plastic Foils and Textiles

Interfacial Drawing: Roll-to-Roll Coating of Semiconducting Polymer and Barrier Films onto Plastic Foils and Textiles

Hydrogels for active photonics

Nanophotonics-enabled smart windows, buildings and wearables

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