Engineering Light at the Nanoscale: Structural Color Filters and Broadband Perfect Absorbers

Ji, Chengang; Lee, Kyu‐Tae; Xu, Ting; Zhou, Jing; Park, Hui Joon; Guo, L. Jay

doi:10.1002/adom.201700368

Cited by 161 publications

(126 citation statements)

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“…There is now a considerable body of work investigating plasmonic structural color and we refer the interested reader to several excellent recent review articles . Here we focus on coloration produced by NPA achieved using plasmonic effects.…”

Section: Applicationsmentioning

confidence: 99%

“…Here we focus on coloration produced by NPA achieved using plasmonic effects. A previous review of strong absorption and coloration can be found in Ji et al…”

Section: Applicationsmentioning

confidence: 99%

“…This review ends with an outlook. We note that near‐perfect absorption can be achieved with a wide range of materials, for which excellent review papers have been previously published …”

Section: Introductionmentioning

confidence: 95%

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Plasmonic Near‐Complete Optical Absorption and Its Applications

Wesemann

Panchenko

et al. 2019

Advanced Optical Materials

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absorption of light. It is, however, possible to engineer artificial materials that are extremely thin and can absorb nearly 100% of the incident light. The most common approach to achieving near perfect absorption (NPA) of light consists of "blocking" the possibility of transmission by, for example, using a reflective surface. Under these circumstances, the amount of light absorbed is controlled by the reflectance of the material, since, in these cases, the absorption is given by A = 1 − | r | 2 . Clearly, high absorption can be obtained when there is vanishing reflectance (r = 0), which takes place under conditions of optical impedance matching. [4] In the following section, we discuss physical interpretations and mechanisms that have been employed for achieving near complete absorption of light using metallic nanostructures, including metasurfaces, as the absorptive element. This is followed by an overview of the applications of near-perfect absorption in fields such as chemical sensing, optoelectronics and photocatalysis. This review ends with an outlook. We note that near-perfect absorption can be achieved with a wide range of materials, for which excellent review papers have been previously published. [5][6][7] The Physics of Perfect Absorption Thin Film Perfect Absorbers: InterferenceAs an introduction, we first review simple thin film approaches to NPA since these play a fundamental role in understanding the underlying physics. Optical thin-film coatings are essential in optical systems today and the simplest example of a thin-film absorber consists of a stack of an optically thin metal film, a thin dielectric film and a highly reflective metallic film. Thin film coatings are widely used as anti-and high-reflection coatings, beamsplitters, and wavelength filters on lenses, windows, displays, [8] and absorbers for efficiency enhancements in photovoltaic cells, [9] as well light emitting diodes (LED) and photodetectors. [10] Their characteristics, design, and fabrication have been studied for over a century and are well-known. [4] In the next section, we will further discuss thin film absorbers where one layer is textured on the nanoscale, but thin-film systems are particularly useful as optical absorbers exhibiting distinct advantages over nanostructured optical metasurfaces. While textured surfaces require an additional level of processing, potentially requiring complex, top-down nanofabrication techniques, [11][12][13] Near-complete absorption of light has the potential to underpin advances in photodetection, advanced chemistry, coloration of materials, and energy. This review paper reports recent progress on the development of metasurfaces and thin film structures that produce strong absorption bands in the visible and longer wavelength regions of the electromagnetic spectrum, due in part to the excitation of plasmonic resonances. Proof-of-concept demonstrations are discussed for applications of these in chemical sensing, the generation of structural color, the creation of optoelectronic devices, and p...

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Section: Applicationsmentioning

confidence: 99%

“…Here we focus on coloration produced by NPA achieved using plasmonic effects. A previous review of strong absorption and coloration can be found in Ji et al…”

Section: Applicationsmentioning

confidence: 99%

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Plasmonic Near‐Complete Optical Absorption and Its Applications

Wesemann

Panchenko

et al. 2019

Advanced Optical Materials

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“…Interaction between visible light and nanostructures can develop colors in the absence of any chemical pigments or dyes . Periodic nanostructures with spatial modulation of refractive index possess photonic bandgap (PBG), which produces a color through the selective reflection of light at the PBG .…”

Section: Introductionmentioning

confidence: 99%

Designing Multicolor Micropatterns of Inverse Opals with Photonic Bandgap and Surface Plasmon Resonance

Lee

Jeon

Lee

et al. 2018

Adv Funct Materials

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Structural coloration provides unique features over chemical coloration, such as nonfading, color tunability, and high color brightness, rendering it useful in various optical applications. To develop the structural colors, two different mechanisms of coloration-photonic bandgap (PBG) and surface plasmon resonance (SPR)-have been separately utilized. In this work, a new method is suggested to create structurally colored micropatterns by regioselectively employing SPR in a single film of inverse opal with PBG. The inverse opals are prepared by thermal embedding of opal into a negative photoresist and its subsequent removal. The inverse opals have a hexagonal array of open pores on the surface which serves as a template to make SPR-active nanostructures through a directional deposition of gold, a perforated gold film and an array of curved gold disks are formed. With a shadow mask lithographically prepared, the gold is regioselectively deposited on the surface of the inverse opal, which results in two distinct regions of gold-free inverse opal with PBG and gold nanostructure with SPR. As PBG and SPR develop their own structural colors respectively, the resultant micropatterns exhibit pronounced dual colors. More importantly, the micropatterns show the distinguished optical response for evaporation of volatile liquids that occupy the pores.

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“…In contrast, structural color filters relying on the phenomenon of interference resulting from material structure represent an alternative approach . Examples of structural‐based color filters include Fabry–Pérot interferometers, waveguide grating structures, and plasmonic resonators . A structural‐based approach possesses a number of advantages like high tolerance to heat, resistance to photodegradation, and long‐term stability.…”

mentioning

confidence: 99%

Stretchable Structural Color Filters Based on a Metal–Insulator–Metal Structure

Ordinario

Jinno

Nayeem

et al. 2018

Advanced Optical Materials

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make structural-based color filters a promising choice for potential future opticsbased applications.In the area of flexible electronics, a number of flexible color filters have recently been reported utilizing either thin-film layer stacks or nanostructures. [15][16][17][18] These flexible filters are generally fabricated on plastic substrates such as polyethylene terephthalate (PET) that are hundreds of micrometers in thickness, feature millimeter to centimeterscale bending radii, and demonstrate little change in transmittance after repeated mechanical bending. Flexible filters can be suitable for a wide range of potential uses where an unusual form factor is required, or even integration with wearable devices. As an example, there have been previous reports of sensors either reliant on optical phenomena or containing simple optical elements that are demonstrably flexible enough to adhere to human skin. [19][20][21] Such devices would require any integrated components to have similar or better mechanical properties in excess of those possessed by current flexible color filters. One important factor to consider is conformal adhesion to a complex surface. Decreasing the film thickness generally results in decreased bending stiffness, allowing for greater adhesion to the surface. [22][23][24][25] To accomplish this, the thickness of the substrate layer can be decreased. Indeed, increased conformity while preserving filter effectiveness would be highly conducive for applications like on-skin pulse oximeters or wearable/implantable imagers where such characteristics are necessary. [26][27][28] Based on these requirements, in addition to flexibility an ideal color filter would also need to simultaneously be ultrathin and stretchable for sufficient mechanical compatibility.Herein, we demonstrate ultrathin, stretchable, and flexible structural color filters based on a simple metal-insulator-metal (MIM) structure on a 1.3 µm ultrathin substrate. We first fabricate silver-silicon dioxide-silver (Ag-SiO 2 -Ag) structures on top of ultrathin parylene substrates and characterize their basic optical and mechanical characteristics. We next investigate how effective the color filters are at both passing the desired wavelengths of light and blocking the undesired wavelengths of light both before and after mechanical deformation. We also describe the angular sensitivity of the color filters and assess its overall impact on filter performance. Remarkably, we find Color filters play a big role in a large number of modern technologies such as displays, sensors, and photovoltaics. In particular, structural color filters possess a number of advantages like high tolerance to heat, resistance to photodegradation, and long-term stability that make them a promising choice for potential future optics-based applications. In the field of flexible electronics, there are many sensors either reliant on optical phenomena or containing simple optical elements that are demonstrably flexible enough to adhere to uneven, deformable surfaces. Such de...

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Engineering Light at the Nanoscale: Structural Color Filters and Broadband Perfect Absorbers

Cited by 161 publications

References 235 publications

Plasmonic Near‐Complete Optical Absorption and Its Applications

Plasmonic Near‐Complete Optical Absorption and Its Applications

Designing Multicolor Micropatterns of Inverse Opals with Photonic Bandgap and Surface Plasmon Resonance

Stretchable Structural Color Filters Based on a Metal–Insulator–Metal Structure

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