A 90-nm-thick graphene metamaterial for strong and extremely broadband absorption of unpolarized light

Lin, Han; Sturmberg, Björn C. P.; Lin, Keng‐Te; Yang, Yunyi; Zheng, Xiaorui; Chong, Teck K.; Sterke, C. Martijn de; Jia, Baohua

doi:10.1038/s41566-019-0389-3

Cited by 411 publications

(326 citation statements)

References 47 publications

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“…Owing to its ease of preparation as well as the tunability of its material properties, GO has become a highly promising member of the graphene family. [ 27,36–39 ] Previously, we reported GO films with a giant Kerr nonlinearity ( n 2 ) of about four orders of magnitude higher than that of silicon, [ 27,40 ] and achieved enhanced FWM CE in GO‐coated doped silica waveguides of up to 6.9 dB for a 1.5 cm‐long waveguide uniformly coated with two layers of GO. [ 29 ] Moreover, GO has a material absorption that is over two orders of magnitude lower than graphene [ 29 ] as well as a large bandgap (2.1−2.4 eV) that yields a low TPA in the telecommunications band.…”

Section: Introductionmentioning

confidence: 99%

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

Yang

et al. 2020

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Layered 2D graphene oxide (GO) films are integrated with micro‐ring resonators (MRRs) to experimentally demonstrate enhanced nonlinear optics. Both uniformly coated (1−5 layers) and patterned (10−50 layers) GO films are integrated on complementary‐metal‐oxide‐semiconductor (CMOS)‐compatible doped silica MRRs using a large‐area, transfer‐free, layer‐by‐layer GO coating method with precise control of the film thickness. The patterned devices further employ photolithography and lift‐off processes to enable precise control of the film placement and coating length. Four‐wave‐mixing (FWM) measurements for different pump powers and resonant wavelengths show a significant improvement in efficiency of ≈7.6 dB for a uniformly coated device with 1 GO layer and ≈10.3 dB for a patterned device with 50 GO layers. The measurements agree well with theory, with the enhancement in FWM efficiency resulting from the high Kerr nonlinearity and low loss of the GO films combined with the strong light–matter interaction within the MRRs. The dependence of GO's third‐order nonlinearity on layer number and pump power is also extracted from the FWM measurements, revealing interesting physical insights about the evolution of the GO films from 2D monolayers to quasi bulk‐like behavior. These results confirm the high nonlinear optical performance of integrated photonic resonators incorporated with 2D layered GO films.

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Section: Introductionmentioning

confidence: 99%

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

Yang

et al. 2020

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“…The main operation principle of these absorbers is based on the phenomenon of localized plasmon resonance (LPR) often complemented with a metamaterial concept to achieve much smaller absorber volumes, sufficient performance, and design flexibility based on geometry rather than the materials used [1][2][3][4]. Absorbers in various parts of electromagnetic spectrum, from visible to microwave [5][6][7][8], have been widely investigated for a wide range of applications, including stealth technology, bolometers and thermal emitters [9][10][11]. Many characteristic absorbers, exhibiting, for example, polarization-insensitive, wide-angle, multi-band and broadband absorption have been realized using different configurations [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Efficient broadband infrared absorbers based on core-shell nanostructures

2019

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We suggest to exploit dielectric-metal core-shell nanostructures for efficient resonant and yet broadband absorption of infrared radiation with deeply subwavelength configurations. Realizing that nanostructures would efficiently absorb radiation only when their dielectric properties match those of the environment and making use of the effective medium approach, we develop the design strategy using core-shell nanostructures with very thin shells made of poor metals, i.e., metals having real and imaginary parts of their dielectric permittivities of the same order of magnitude. Analyzing in detail spherical and cylindrical core-shell nanostructures, we demonstrate that the resonant infrared absorption can be not only very efficient, i.e., with the absorption cross sections exceeding geometrical ones, but also broadband with the spectral width being of the order of the resonant wavelength. We obtain simple analytical expressions for the absorption resonances in spherical and cylindrical configurations that allow one to quickly identify the configuration parameters ensuring strong infrared absorption in a given spectral range. Relations to effective medium parameters obtained by the internal homogenization are established and discussed. We believe that our results can be used as practical guidelines for realization of efficient broadband infrared absorbers of subwavelength sizes desirable in diverse applications.

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“…It is observed that the surface texturing/etching followed by nano‐coating shows enhanced light trapping capacity in a broader wavelength range. Recently, the use of metamaterials is reported to process nearly perfect ultra‐black absorbers can be fabricated . However, due to their limitations such as narrow bandwidth, complex structure, and costly fabrication routes, these absorbers find limited application.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these issues, efforts have been made to fabricate near perfect optical absorber coating using nanomaterials . Among these, carbon‐based nanomaterials finds huge potential in the fabrication of ultra‐black absorbers due to their exciting combination of properties . Moreover, vertically aligned carbon nanotubes (VACNT) grown on silicon wafers shows an ultra‐high absorption of more than 99% in entire UV–Vis–NIR region .…”

Section: Introductionmentioning

confidence: 99%

Near perfect thin film flexible broadband optical absorber with high thermal/electrical conductivity

Ghai

Singh

Agnihotri

2019

J of Applied Polymer Sci

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Flexible ultra-black absorber with high thermal/electrical conductivity finds huge applications in the field of stray light attenuation, solar collectors, flexible electronics, and electronic thermal management systems. In this work, we report the fabrication of ultrablack absorber consists of vertically aligned carbon nanotubes (VACNT) in Polydimethylsiloxane (PDMS) having an absorption capacity of more than 98% in UV-Vis wavelength and more than 94% in NIR wavelength range. It is observed that the PDMS-VACNT composite shows ultra-high absorption capacity due to enhanced impedance matching and multiple scattering. In addition to this, the PDMS-VACNT composite shows an emissivity of 0.94 along with a 118% increase in thermal conductivity. Moreover, with the infiltration of VACNT in PDMS, the sheet resistance decrease drastically to 0.08 KΩ/sq, which signify the possible use of ultrablack absorber in electronic skin and flexible sensors etc.

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A 90-nm-thick graphene metamaterial for strong and extremely broadband absorption of unpolarized light

Cited by 411 publications

References 47 publications

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

Efficient broadband infrared absorbers based on core-shell nanostructures

Near perfect thin film flexible broadband optical absorber with high thermal/electrical conductivity

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