Angle Insensitive Color Filters in Transmission Covering the Visible Region

Mao, Kening; Shen, Weidong; Yang, Chenying; Fang, Xu; Yuan, Weiyong; Zhang, Yueguang; Liu, Xu

doi:10.1038/srep19289

Cited by 70 publications

(43 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Plasmonic color generation offers potential advantages over pigment‐based printing, including simplified production and the use of fewer materials. Specific plasmonic techniques vary in terms of which additional desirable features they possess, as reviewed by Kristensen et al Targets for overt printed pixel methods include tunability across the visible spectrum, vibrant colors, durability, high resolution pixels, and viewing angle insensitivity . Depending on the intended application and mode of operation, polarization independence may be considered a performance indicator, while alternatively a polarization‐dependent response may add functionality .…”

Section: Grating Dimensions and Chromaticity Data For The Selected Rvmentioning

confidence: 99%

Covert Images Using Surface Plasmon‐Mediated Optical Polarization Conversion

Finlayson

Hooper

Lawrence

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

metal sheets. [17][18][19] Diffractive coupling of light to surface plasmon polaritons [2,3] (SPPs) via a periodically textured surface (a diffraction grating) has been demonstrated as a mechanism for optical polarization conversion. [20][21][22] The arrangement of surface-relief diffraction gratings into arrays of pixels is already established as a means of creating images in optically variable devices, with diffraction as the principal color-generating mechanism rather than plasmonic interaction. [23] Such devices are now familiar as overt optical security features on banknotes and on retail products. A further goal for document security and anticounterfeiting is the inclusion of covert images, text, or patterns, [1] whereby latent features that are invisible to the naked eye may be revealed and verified under certain specific viewing conditions. This application has been the subject of several approaches, including luminescent inks, [24] plasmonic surface-enhanced Raman spectroscopy, [25] controlled wetting of nanopillar arrays, [26] polarization conversion using polymerized liquid crystals, [27] circularly polarized light reflectance, [28] infrared images, [29] magnetic field-responsive colloids, [30] and grayscale images that are revealed by second harmonic generation. [31] In this work, we present a device that utilizes plasmonic color generation and polarization control for the realization of optical security features. Covert full-color images are demonstrated in which the concealed spectral signature exists in light that has undergone an orthogonal conversion of its polarization state upon reflection from a plasmonic surface (Figure 1). A polarization-sensitive optical system is required to view the image and its color signature, which are not visible to the naked eye at normal incidence. Nanostructured grating coupling is used to produce red, green, and blue (RGB) primary colors through tailored surface plasmon interactions. The RGB color space encloses a wide gamut of chromaticities, enabling accurate color definition using additive color mixing. We have created a large-area (14.4 mm × 9.6 mm) color reproduction of the famous Mona Lisa portrait using an array of juxtaposed plasmonic pixels. Electron-beam lithography is used for the fabrication of the nanostructured surface.Plasmonic color generation offers potential advantages over pigment-based printing, including simplified production and the use of fewer materials. Specific plasmonic techniques vary in terms of which additional desirable features they possess, as Covert optical signatures are a vital element in anticounterfeiting technologies. Plasmonic surfaces offer a means of manipulating the properties of light including the realization of colored pixels and images. In this work, concealed images with accurate color reproduction using plasmonic pixel arrays are demonstrated. The spectral and spatial control of optical polarization conversion is accomplished by tailoring the interaction of light with surface plasmons through the design and arrange...

show abstract

Section: Grating Dimensions and Chromaticity Data For The Selected Rvmentioning

confidence: 99%

Covert Images Using Surface Plasmon‐Mediated Optical Polarization Conversion

Finlayson

Hooper

Lawrence

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…Such artificially engineered nanophotonic structures are useful for manipulating the spectral properties of transmission, reflection, and absorption in the visible spectral regime via the modification of their design parameters. However, the configuration of the multiple layers is not adequate for generating a complicated color pattern in a small scale in view of the precision multi‐step lithography processes that are required to produce different colors, on top of the difficulty in the thickness control . For the nanostructures resorting to the diffraction grating, a severe angular dependence is likely to emerge due to the dependence of its spectral resonance on the periodicity , which poses a grave concern for the applications like the imaging and color printing.…”

Section: Introductionmentioning

confidence: 99%

Highly reflective subtractive color filters capitalizing on a silicon metasurface integrated with nanostructured aluminum mirrors

Yue

Gao

Kim

et al. 2017

Laser & Photonics Reviews

View full text Add to dashboard Cite

Metasurface‐based color filters have been recently applied for the creation of imaging devices and color printing in a subwavelength scale. In this work, a highly reflective subtractive color filter featuring an excellent color contrast is conceived and demonstrated, by exploiting a crystalline‐silicon nanopillar (NP)‐based dielectric metasurface integrated with an aluminum disk mirror (DM) and holey mirror (HM) at the top and bottom, respectively. A deep suppression in reflection is acquired through a magnetic dipole (MD) resonance that is supported by the constituent NP, and can be effectively tailored via the control of the NP diameter. The cooperation of the nanostructured DM and HM plays a dual role of dramatically boosting the efficiency and reinforcing the confinement of the MD in the NP, which is primarily accountable for the reduction in the spectral bandwidth. For the manufactured filters, both a high reflection efficiency reaching ∼70% and relatively small bandwidth of ∼55 nm are attained, thus leading to a broad palette of vivid and bright colors. The proposed devices are supposed to exhibit a polarization‐insensitive operation and a relaxed angular tolerance, thereby facilitating the implementation of miniaturized display/imaging devices with a high resolution and excellent color fidelity.

show abstract

“…Metasurfaces, which are specially engineered materials that flexibly modulate incident light at the nanoscale, are of great interest for lenses, plasmonic detectors, light harvesting, and structural colors . Since structural colors originate from the interaction between incident light and micro/nanostructures, different colors can be obtained by varying the geometries and dimensions of the structures . With the development of micro‐ and nanofabrication, structural colors have aroused tremendous interest for potential applications in anti‐counterfeiting, display/image devices, and printing, showing great prospects for sustainable production and recycling .…”

mentioning

confidence: 99%

“…Since structural colors originate from the interaction between incident light and micro/nanostructures, different colors can be obtained by varying the geometries and dimensions of the structures . With the development of micro‐ and nanofabrication, structural colors have aroused tremendous interest for potential applications in anti‐counterfeiting, display/image devices, and printing, showing great prospects for sustainable production and recycling . Recently, structural colors based on perforated metal films, silicon dioxide (SiO 2 )‐loaded aluminum (Al), Al–silicon nitride (SiN x ) nanowire arrays, metal–insulator‐metal nanoresonators, and Al nanopatches/cylinders have been presented .…”

mentioning

confidence: 99%

“…In these cases, color‐rendering samples are generally fabricated on micrometer scales by focused ion beam or electron‐beam lithography. Given this drawback, multilayer stacked films, such as silver (Ag)–SiO 2 –Ag, Ag‐titanium oxide (TiO 2 )‐Ag, and Ag‐amorphous silicon (a‐Si)‐Ag, with large areas have been explored. However, the variation range of the colors from these films is usually limited, and for that reason the films cannot be applied for optical security.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Large‐Area, Optical Variable‐Color Metasurfaces Based on Pixelated Plasmonic Nanogratings

Yan

Duan

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

aroused tremendous interest for potential applications in anti-counterfeiting, [15,16] display/image devices, [17][18][19] and printing, [20,21] showing great prospects for sustainable production and recycling. [11] Recently, structural colors based on perforated metal films, [39,41] silicon dioxide (SiO 2 )loaded aluminum (Al), [34] Al-silicon nitride (SiN x ) nanowire arrays, [35] metalinsulator-metal nanoresonators, [10,27,28] and Al nanopatches/cylinders have been presented. [32,40] In these cases, colorrendering samples are generally fabricated on micrometer scales by focused ion beam or electron-beam lithography. Given this drawback, multilayer stacked films, such as silver (Ag)-SiO 2 -Ag, [21] Ag-titanium oxide (TiO 2 )-Ag, [22] and Ag-amorphous silicon (a-Si)-Ag, [23] with large areas have been explored. However, the variation range of the colors from these films is usually limited, and for that reason the films cannot be applied for optical security. Furthermore, in these configurations, noble metals are usually involved, which limits their practical applications. The metal Al, with low cost, natural abundance, high stability, good adhesion to various platforms, and compatibility with the complementary-metal-oxide-semiconductor process, [42,43] has been regarded as the most promising material for a variety of practical industrial applications. Moreover, its plasma frequency is higher than that of gold (Au) or Ag, making it the most promising metal for structural colors covering the entire visible range.Here, we develop a plasmonic metasurface that consists of one-dimensional (1D) dielectric grating arrays incorporating an Al nanopatch array and a SiN x layer. The metasurface transmits polarization-dependent colors in perpendicular planes at the same incident angle, which results from the asymmetric geometric of the metasurface. A wide range of high-purity colors, including red (R), green (G), and blue (B), is obtained in the transmission by fine-tuning the period of the nanograting. A peak efficiency of ≈60% is obtained as a result of surface plasmonic resonance (SPR) and guided mode resonance (GMR). Finally, large-area (3 cm × 3 cm) samples with various grating periods are experimentally demonstrated, incorporating highthroughput and low-cost continuously variable spatial frequency photolithography, which has advantages in fabrication speed, fabrication area, and cost.Structure design. The proposed metasurface is schematically illustrated in Figure 1, where a 230 nm thick dielectric grating, a 30 nm thick Al layer and a 200 nm thick SiN x film are stacked Color printing based on plasmonic nanostructures has attracted much attention due to its broad potential applications. It is still an open question regarding how to achieve large-area plasmonic colors for practical use. In this study, large-area plasmonic metasurfaces that incorporate a dielectric grating, an aluminum nanopatch array, and a silicon nitride layer are designed and fabricated. The asymmetric geometry of the metasurfaces produces a strong ...

show abstract

Angle Insensitive Color Filters in Transmission Covering the Visible Region

Cited by 70 publications

References 17 publications

Covert Images Using Surface Plasmon‐Mediated Optical Polarization Conversion

Covert Images Using Surface Plasmon‐Mediated Optical Polarization Conversion

Highly reflective subtractive color filters capitalizing on a silicon metasurface integrated with nanostructured aluminum mirrors

Large‐Area, Optical Variable‐Color Metasurfaces Based on Pixelated Plasmonic Nanogratings

Contact Info

Product

Resources

About