Dynamic Structural Colors Based on All‐Dielectric Mie Resonators

Wu, Yunkai; Chen, Yimu; Song, Qinghai; Xiao, Shumin

doi:10.1002/adom.202002126

Cited by 51 publications

(35 citation statements)

References 156 publications

(186 reference statements)

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“…Their fascination does not only reproduce the brilliant natural examples, but also offer versatile applications in bioinspired functional photonic materials [7][8][9]. The structural colors can be produced by various mechanisms, such as surface plasmon resonances [10][11][12][13][14][15][16][17][18], Mie-type scattering by all-dielectric nanoparticles [19,[19][20][21][22][23][24], diffractive structures [25][26][27][28], or thin-film interference [29][30][31][32]. From the standpoint of manufacturability, the thin film-induced structural colors are advantageous for macro-fabrication and integration into devices, as they do not require complex nanofabrication methods such as lithography, etching, milling or femtosecond laser writing [33,34].…”

Section: Introductionmentioning

confidence: 99%

Wear-resistant surface coloring by ultrathin optical coatings

Geng

Shi

et al. 2022

PhotoniX

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We design, fabricate, optically and mechanically characterize wearable ultrathin coatings on various substrates, including sapphire, glass and silicon wafer. Extremely hard ceramic materials titanium nitride (TiN), aluminium nitride (AlN), and titanium aluminium nitride (TiAlN) are employed as reflective, isolated and absorptive coating layer, respectively. Two types of coatings have been demonstrated. First, we deposit TiAlN after TiN on various substrates (TiAlN-TiN, total thicknesses <100 nm), achieving vivid and viewing-angle independent surface colors. The colors can be tuned by varying the thickness of TiAlN layer. The wear resistance of the colorful ultrathin optical coatings is verified by scratch tests. The Mohs hardness of commonly used surface coloring made of Si-/Ge-metals on substrates is <2.5, as soft as fingernail. However, the Mohs hardness of our TiAlN-TiN on substrates is evaulated to be 7-9, harder than quartz. Second, Fano-resonant optical coating (FROC), which can transmit and reflect the same color as a beam split filter is also obtained by successively coating TiAlN-TiN-AlN-TiN (four-layer film with a total thickness of 130 nm) on transparent substrates. The FROC coating is as hard as glass. Such wearable and color-tunable thin-film structural colors and filters may be attractive for many practical applications such as sunglasses.

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Section: Introductionmentioning

confidence: 99%

Wear-resistant surface coloring by ultrathin optical coatings

Geng

Shi

et al. 2022

PhotoniX

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“…Surface coloring and optical encryption have been studied in recent years for their potential applications in high-resolution displays, information security, and anticounterfeiting. [1][2][3] Metasurfaces, which are composed of periodic subwavelength manmade nanostructures, demonstrate abilities to manipulate the phase, amplitude, and polarization of incident light. [4][5][6][7] Among the materials that are used to create visible metasurfaces, titanium dioxide (TiO 2 ) is a candidate due to its high transmittance, large refractive index, high stability, nontoxicity, and low cost.…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Direction Controllable Nano‐Patterning of Titanium by Ultrafast Laser for Surface Coloring and Optical Encryption

Qiao

Yan

Jiang

2021

Advanced Optical Materials

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Different applications of TiO 2 metasurfaces, such as dynamic metadevices, [8] metalens, [10] color nanoprinting, [2,[11][12][13] vacuum ultraviolet third harmonic generation, [14] and holo graphy [15,16] have been demonstrated. The fabrication of delicate TiO 2 nanostructures is the basis for the applications of TiO 2 metasurfaces.Laser processing is a maskless and path-directed technique, and it has been used in cutting, welding, drilling, and surface coloring. [17][18][19][20][21][22] However, the resolution of laser processing is usually limited by the diffraction limit. [23,24] Compared with the long pulsed laser, ultrafast laser has attracted attentions in both academic research and engineering for its sub-diffraction-limited spatial resolution. [25][26][27] Femtosecond laser induced two-photon polymerization (TPP) can be used for the fabrication of nanostructured components. [28] For example, fibroin nanowires with widths down to 350 nm was achieved by aqueous multiphoton lithography. [29] Polymer nanowires with widths smaller than 175 nm was achieved by a femtosecond two-photon lithography technique. [30] Unfortunately, TPP cannot be used for processing of bulk materials and are required to be fabricated in liquids. Another method for processing nanostructures is laser-induced periodic surface structuring (LIPSS). LIPSS can be fabricated on almost all types of materials (metals, semiconductors, dielectrics). [31][32][33] For instance, uniform periodic nanostructures with width of 375 nm were formed on titanium using a femtosecond laser. [34] However, the period of the nanostructures processed by LIPSS is normally uncontrollable. The method is lack of flexibility for fabrication of TiO 2 metasurfaces. In recent years, nano-patterning on TiO 2 , [35] silicon, [36] and silk fiber, [37] have been achieved by near-field enhanced ultrafast laser induced localized breakdown. Nano-patterning on metal surface has been achieved by spatially modulated ultrafast laser, [38] microspheres assisted nano-patterning, [39] and femtosecond laser direct writing. [40] Nevertheless, these ultrafast laser nanopatterning methods can only be used for drilling and grooving by ablation. An optical nano-patterning method for the preparation of TiO 2 metasurfaces on titanium surface is still desired.Herein, we report an ultrafast laser nano-patterning approach of writing direction controllable TiO 2 nanostructures, which can be used for surface coloring and optical encryption. The dynamic process of TiO 2 nanostructures growth and mechanisms were studied. A diverse of patterns of TiO 2 Metasurfaces constructed from subwavelength nanostructures provide a route for surface coloring and optical encryption. Because of the high transmittance and refractive index, titanium dioxide (TiO 2 ) is a candidate for visible metasurfaces, and its nano-processing is essential for TiO 2 metasurfaces. Herein, a direction-controllable ultrafast laser nano-patterning approach is reported for writing TiO 2 nanostructures on titanium. The writing directio...

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“…Unlike conventional optical components based on light propagation and refraction in bulk materials, metasurfaces employ specially distributed nanoantennas to tailor light with desired amplitude, phase, and polarization. [1][2][3][4] A broad range of functionality based on the ability of nanoantennas to accurately modulate light have been experimentally achieved, such as structural color, [5][6][7][8][9][10] metaholograms, [11][12][13][14][15][16] metalenses, [17,18] and many others. [19,20] The nanoscale tailoring of light inspires improvements to exciting optical functionality and expands the potential applications of metasurfaces in ever more directions.…”

Section: Introductionmentioning

confidence: 99%

“…As one of the specific applications, a structural color metasurface can generate a vivid image via a spatial arrangement of resonant nanostructures, [5,[7][8][9][10] whereas a dynamic color response can be efficiently achieved by changing the refractive index that surrounds the antennas. These properties make it a suitable candidate to directly investigate the optical and self-cleaning performance of the metasurface.…”

Section: Introductionmentioning

confidence: 99%

A Versatile Metasurface Enabling Superwettability for Self‐Cleaning and Dynamic Color Response

Sain

Georgi

et al. 2021

Advanced Optical Materials

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improvements to exciting optical functionality and expands the potential applications of metasurfaces in ever more directions. However, the fragile nano structures are typically highly sensitive to dust and other contaminants, which ultimately limits their wider application. Until now, there is no solution to efficiently clean or protect from the dust contamination on a metasurface that consists of specifically designed antennas. Hence, finding a feasible strategy to clean the metasurface without affecting its optical performance or damage the nanostructures is extremely promising for various practical applications. Furthermore, future development of metasurfaces entails not only continuous efforts to improve the optical performance but also accessible strategies to enhance the device adaptability and effectiveness in complex application conditions. [21][22][23] This means metasurface with enhanced optical performance, physical stability, and smarter functionality are important properties that need to be considered when one designs the device.

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Dynamic Structural Colors Based on All‐Dielectric Mie Resonators

Cited by 51 publications

References 156 publications

Wear-resistant surface coloring by ultrathin optical coatings

Wear-resistant surface coloring by ultrathin optical coatings

Direction Controllable Nano‐Patterning of Titanium by Ultrafast Laser for Surface Coloring and Optical Encryption

A Versatile Metasurface Enabling Superwettability for Self‐Cleaning and Dynamic Color Response

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