Near-Perfect Absorbing Copper Metamaterial for Solar Fuel Generation

Loh, Joel Y. Y.; Safari, Mahdi; Mao, Chengliang; Viasus, Camilo J.; Eleftheriades, George V.; Ozin, Geoffrey A.; Kherani, Nazir P.

doi:10.1021/acs.nanolett.1c02886

Cited by 29 publications

(21 citation statements)

References 38 publications

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“…An important index parameter to evaluate the performance of an absorber is to see whether it can always retain good absorption performance under the conditions of different polarization modes, different polarization angles, and different incident angles [ 21 , 22 ]. The influence of different polarization modes and polarization angles are also illustrated in Figure 9 .…”

Section: Resultsmentioning

confidence: 99%

A Polarization-Insensitive Broadband Terahertz Absorber Using Patterned Graphene

Wang

Guo

et al. 2022

Nanomaterials

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A polarization-insensitive broadband terahertz absorber with a sandwich structure of metal–dielectric-graphene is designed and simulated. The graphene is patterned as an array of graphene square blocks with circular apertures. The results of the simulations and theoretical analysis show that the absorption exceeds 99% from 0.93 to 1.65 THz while 90% from 0.80 to 1.87 THz, and a broad relative bandwidth of 80.2% is achieved. The absorption performance is passively enhanced by altering physical dimensions of the graphene pattern and actively adjusted by changing the chemical potential of graphene. When the chemical potential increases from 0.1 eV to 0.7 eV, the corresponding terahertz absorption increases from 59.1% to 99%. The mechanism of absorption is disclosed by analyzing the impedance matching theory and distribution of electric-field intensity. In addition, different polarization modes and incident angles are also studied. The proposed absorber has the superiorities of broad relative bandwidth, high absorption rate, polarization insensitivity, and a wide incident angle, which offers some potential applications in the field of terahertz technology such as imaging, detection, and cloaking.

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Section: Resultsmentioning

confidence: 99%

A Polarization-Insensitive Broadband Terahertz Absorber Using Patterned Graphene

Wang

Guo

et al. 2022

Nanomaterials

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“…Copper (Cu) nanocrystals are receiving increasing attention due to their distinctive optical and catalytic properties. Cu is among the few metals that can afford strong localized surface plasmon resonance (LSPR) in the visible range of the spectrum [ 1–3 ] and are therefore applicable in many LSPR‐based applications, such as surface‐enhanced Raman scattering, [ 4,5 ] photocatalysis, [ 6–8 ] and solar–thermal conversion, [ 9 ] at a significantly lower cost than their noble metal (Ag and Au) counterparts. Moreover, Cu nanocrystals are important catalysts for a broad range of reactions.…”

Section: Introductionmentioning

confidence: 99%

Lattice Mismatch–Induced Formation of Copper Nanoplates with Embedded Ultrasmall Platinum or Palladium Cores for Tunable Optical Properties

Qiao

Yang

Fan

et al. 2023

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Although noble metal nanocrystals have been studied extensively in the past decades, the shape‐controlled synthesis of non‐noble metal nanocrystals has remained challenging with limited success, which is a grand obstacle to their wide applications. Herein, a novel lattice mismatch–involved shape‐control mechanism of Cu nanocrystals in a seed‐mediated synthesis is reported, which can produce Cu nanoplates in high yield with tailored sizes (28–130 nm), holding great potential in optical and catalytic applications. The lattice mismatch between Cu and the seed is found effective in inducing crystallographic defects for symmetry breaking toward anisotropic nanocrystals. While a too‐large lattice mismatch (11.7% for Au seeds) leads to multiple twin defects to form quasi‐spherical Cu nanocrystals, an appropriately large lattice mismatch (7.7% for Pt and 6.9% for Pd seeds) successfully induces planar defects for the formation of Cu nanoplates. The size of the Cu nanoplates is customizable by controlling the concentration of the seeds, leading to tunable optical properties. A prototype of a colorimetric indicator with Cu nanoplates, potentially applicable to the safety control of foods and drugs is demonstrated. This mechanism paves a new way for the shape‐controlled synthesis of Cu and other metal nanocrystals for a broad range of applications.

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“…Ideal electromagnetic wave absorbers possess nearly perfect absorption for omnidirectional and unpolarized incident radiation over a certain waveband, which can also be called blackbody absorbers, showing extremely valuable applications in solar photovoltaics, cloaking, photodetection, photocatalysis, and optical modulators. [1][2][3][4][5][6][7][8][9] Great efforts have been made to achieve perfect absorbers. Nowadays, blackbody absorbers are usually coated layers composed of different DOI: 10.1002/lpor.202200364 nanomaterials and nanostructures, such as vertically aligned carbon nanotube forest, [10][11][12] silicon nanocone, [2] oxide nanorods, [13] various metallic nanostructures, [14,15] and so on.…”

Section: Introductionmentioning

confidence: 99%

Strong and Omnidirectional Light Absorption from Ultraviolet to Near‐Infrared Using GST Metasurface

Pan

Geng

et al. 2022

Laser & Photonics Reviews

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For the perfect light absorber, it has been a huge challenge to simultaneously realize ultra‐broadband and strong absorption of unpolarized light over a large angular range, though various materials and designs have been tried. The emergence of optical metasurface with powerful light field regulation ability provides a promising new strategy for achieving perfect absorbers. Here, a Ge2Sb2Te5 (GST)‐based metasurface with an average 92.5%/94.7% (experiment/simulation) absorptivity of unpolarized light, covering an ultra‐broadband from ultraviolet to near‐infrared region is designed and demonstrated. This GST‐based metasurface consists of double‐layer GST interspaced by SiO2 layer, and both field localizations in the top patterned GST layer and intrinsic loss of the bottom patternless GST layer together contribute to this broadband absorption over wide incident angles up to 70°. Strong absorbing ability, large angular responses, and feasibly scalable fabrication for such a perfect GST‐based metasurface absorber offer more promising application opportunities in integrated optoelectronic devices.

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Near-Perfect Absorbing Copper Metamaterial for Solar Fuel Generation

Cited by 29 publications

References 38 publications

A Polarization-Insensitive Broadband Terahertz Absorber Using Patterned Graphene

A Polarization-Insensitive Broadband Terahertz Absorber Using Patterned Graphene

Lattice Mismatch–Induced Formation of Copper Nanoplates with Embedded Ultrasmall Platinum or Palladium Cores for Tunable Optical Properties

Strong and Omnidirectional Light Absorption from Ultraviolet to Near‐Infrared Using GST Metasurface

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