All-Dielectric Metasurfaces Based on Cross-Shaped Resonators for Color Pixels with Extended Gamut

Vashistha, Vishal; Vaidya, Gayatri; Hegde, Ravi S.; Serebryannikov, Andriy E.; Bonod, Nicolas; Krawczyk, Maciej

doi:10.1021/acsphotonics.6b00853

Cited by 144 publications

(98 citation statements)

References 49 publications

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“…Recent advances in nanofabrication and characterisation have contributed to a plethora of investigations into methods of structural coloration, one of the simplest and most scalable being thin film, or Fabry‐Peŕot, coloration, which produces selective reflection based on interference between parallel surfaces in a nanoscale cavity . Anodised aluminium oxide (AAO) is a popular platform for thin film coloration, since a simple electrochemical process creates a dielectric cavity on the surface of the aluminium substrate with a thickness of the order of visible light wavelengths .…”

Section: Introductionmentioning

confidence: 99%

Reduced angle sensitivity of structural coloration on an industrial aluminium platform

Odessey

Shen

Oller

et al. 2020

Coloration Technology

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Existing structural coloration methods using thin films, commonly implemented in high-purity aluminium, produce colours which are highly dependent on the viewing angle because of the inherent angular dependence of thin film interference. Adapting the thin film coloration mechanism to anodisation of industrial-quality aluminium alloys, which scatter light more efficiently than their high-purity counterparts, reduces angle dependence in the colour produced. This reduction of angle dependence, as well as the wide use of anodised aluminium in consumer products, suggests that structural colour based on anodised aluminium could potentially be scaled up for commercial scale production.

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Section: Introductionmentioning

confidence: 99%

Reduced angle sensitivity of structural coloration on an industrial aluminium platform

Odessey

Shen

Oller

et al. 2020

Coloration Technology

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“…It was shown recently that plasmonic nanoantenna structures based on the principals of a perfect absorber can be used to create CMY color filters. The technique permits the fabrication of plasmonic pixels which are capable of producing a wide color gamut . color filters based on LSP resonances require no dyes or pigments and are fully compatible with complementary metal‐oxide‐semiconductor (CMOS) fabrication process.…”

Section: Introductionmentioning

confidence: 99%

Ultracompact Camera Pixel with Integrated Plasmonic Color Filters

Panchenko

Wesemann

Gómez

et al. 2019

Advanced Optical Materials

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such as point-of-care devices and endoscopy where cameras with high resolution, speed, and sensitivity are important. Cameras with an extended wavelength sensitivity into the ultraviolet, near-infrared (IR), and deep infrared regions of the spectrum [3,4] are also becoming more widely used.The pixel is an elementary unit of the digital camera and its size imposes a fundamental constraint on the amount of information that can be recorded on a sensor with a certain area. Since compact, highresolution sensors are of greatest interest for portable devices such as mobile phones and digital cameras, a significant effort has been made in improving the image quality provided by small-area sensors. [5,6] Various technological approaches such as deep trench isolation [7] and back side illumination [8] were proposed to reduce the pixel size below 1.2 µm. Although there has been remarkable success in recent years, [9] reducing the pixel size still faces challenges in implementation and requires improvements in current technology to meet the demand for ultracompact image sensors. The operating principle of the majority of commercially available color camera sensors is based on the design shown in Figure 1a. The incoming light passes through a mosaic filter with a particular color pattern. The color filters usually incorporate dyes or pigments and transmit a particular wavelength spectrum while the remainder is absorbed. [10] These filters provide wavelength selectivity since the sensor itself has a broad wavelength response. The filtered light is then incident on an array of photodetectors. Each cell represents a single pixel and is dedicated to sensing a certain part of the visible spectrum in one region of the image. Figure 1b shows a schematic representation of cross sections through three pixels each responsible for detection of either red, green, or blue regions of the visible spectrum. The filters and the photodetector integrated circuit are fabricated separately and subsequently combined in a separate step. As the pixel size decreases, the alignment of these layers becomes challenging. Moreover, the requirement for two different fabrication processes as well as additional alignment steps increases the final cost of the camera matrix.In contrast, filters based on the phenomenon of localized surface plasmons (LSPs) provide an opportunity to decrease the pixel size to micrometer or even sub-micrometer Photodetector size imposes a fundamental limit on the amount of information that can be recorded by an image sensor. Compact, highresolution sensors are generally preferred for portable electronic devices such as mobile phones and digital cameras, and as a result, a significant effort has been invested in improving the image quality provided by small-area image sensors. Reducing photodetector size, however, still faces challenges in implementation requiring improvements in current technology to meet the demand for ultracompact imaging systems such as cameras. An issue with a decrease in size is associated with photodetectors...

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“…The high refractive index of Si allows one to properly manipulate magnetic and electric components of light simultaneously, while in case of metal nanoantennas absorption losses are high and interaction with magnetic component of light is poor. Recently, all-dielectric structures based on Si nanoresonators have been suggested for creating low-loss high quality color filters 24,34 . All dielectric nanoantennas based colors filters enables the high quality of colors with extended gamut 34 .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, all-dielectric structures based on Si nanoresonators have been suggested for creating low-loss high quality color filters 24,34 . All dielectric nanoantennas based colors filters enables the high quality of colors with extended gamut 34 . These color filters operate in reflection mode and show high quality of the colors.…”

Section: Introductionmentioning

confidence: 99%

“…The high quality saturated colors using Si nanoantenna are due to the inherent property of high quality resonances (sharp resonances compared to metal nanoantenna). This results in wide gamut of saturated colors 34 . The recent progress in the area of light-matter interaction allows to efficiently utilize different spectral components of light in different regimes in one device.…”

Section: Introductionmentioning

confidence: 99%

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Polarization tunable all-dielectric color filters based on cross-shaped Si nanoantennas

Vashistha

Vaidya

Gruszecki

et al. 2017

Sci Rep

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Polarization sensitive and insensitive color filters have important applications in the area of nano-spectroscopy and CCD imaging applications. Metallic nanostructures provide an efficient way to design and engineer ultrathin color filters. These nanostructures have capability to split the white light into fundamental colors and enable color filters with ultrahigh resolution but their efficiency can be restricted due to high losses in metals especially at the visible wavelengths. In this work, we demonstrate all-dielectric color filters based on Si nanoantennas, which are sensitive to incident-wave polarization and, thus, tunable with the aid of polarization angle variation. Two different information can be encoded in two different polarization states in one nanostructure. The nanoantenna based pixels are highly efficient and can provide high quality of colors, in particular, due to low losses in Si at optical frequencies. We experimentally demonstrate that a variety of colors can be achieved by changing the physical size of the nonsymmetric cross-shaped nanoantennas. The proposed devices allow to cover an extended gamut of colors on CIE-1931 chromaticity diagram owing to the existence of high-quality resonances in Si nanoantennas. Significant tunability of the suggested color filters can be achieved by varying polarization angle in both transmission and reflection mode. Additional tunability can be obtained by switching between transmission and reflection modes.

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All-Dielectric Metasurfaces Based on Cross-Shaped Resonators for Color Pixels with Extended Gamut

Abstract: International audienc

Cited by 144 publications

References 49 publications

Reduced angle sensitivity of structural coloration on an industrial aluminium platform

Reduced angle sensitivity of structural coloration on an industrial aluminium platform

Ultracompact Camera Pixel with Integrated Plasmonic Color Filters

Polarization tunable all-dielectric color filters based on cross-shaped Si nanoantennas

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