Near unity ultraviolet absorption in graphene without patterning

Zhu, Jinfeng; Yan, Shuang; Feng, Naixing; Ye, Longfang; Ou, Jun‐Yu; Liu, Qing

doi:10.1063/1.5022768

Cited by 52 publications

(30 citation statements)

References 28 publications

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“…(f) Unpatterned layered structures in dielectric/graphene/metal and graphene/ dielectric/metal arrangements for UV light absorption. 189 (g) SiC-based 1D PC that is appropriate for light absorption within 10.3−12.6 μm window in the mid-IR range. 191 (h) hBN-based 1D PC that can act as nearly perfect light absorption and coherent thermal emission within two 6.2−7.3 μm and 12−12.82 μm windows in the MIR range.…”

Section: −147mentioning

confidence: 99%

Strong Light–Matter Interaction in Lithography-Free Planar Metamaterial Perfect Absorbers

et al. 2018

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The efficient harvesting of electromagnetic (EM) waves by subwavelength nanostructures can result in perfect light absorption in the narrow or broad frequency range. These metamaterial-based perfect light absorbers are of particular interest in many applications, including thermal photovoltaics, photovoltaics, sensing, filtering, and photodetection applications. Although advances in nanofabrication have provided the opportunity to observe strong light−matter interaction in various optical nanostructures, the repeatability and upscaling of these nano units have remained a challenge for their use in large scale applications. Thus, in recent years, the concept of lithography-free planar light perfect absorbers has attracted much attention in different parts of the EM spectrum, owing to their ease of fabrication and high functionality. This Perspective explores the material and architecture requirements for the realization of light perfect absorption using these multilayer metamaterial designs from ultraviolet (UV) to far-infrared (FIR) wavelength regimes. We provide a general theoretical formulation to find the ideal condition for achieving near unity light absorption. Later, these theoretical estimations are coupled with findings of recent studies on perfect light absorbers to explore the physical phenomena and the limits of different materials and design architectures. These studies are categorized in three main class of materials; metals, semiconductors, and other types of materials. We show that, by the use of proper material and design configuration, it is possible to realize these lithography-free light perfect absorbers in every portion of the EM spectrum. This, in turn, opens up the opportunity of the practical application of these perfect absorbers in large scale dimensions. In the last section, we discuss the progress, challenges, and outlook of this field to outline its future direction.

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Section: −147mentioning

confidence: 99%

Strong Light–Matter Interaction in Lithography-Free Planar Metamaterial Perfect Absorbers

et al. 2018

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“…. , N , the amplitude A n can be derived from (21) by using the initial condition A 1 = F s which can be obtained from (13) or (14) when i = 1.…”

Section: Global (Generalized) Reflection and Transmission Matricesmentioning

confidence: 99%

Spectral Numerical Mode-Matching Method for 3-D Layered Multiregion Structures

Liu

2020

IEEE Trans. Antennas Propagat.

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The spectral numerical mode-matching (SNMM) method is developed to simulate the 3D layered multi-region structures. The SNMM method is a semi-analytical solver having the properties of dimensionality reduction to reduce computational costs; it is especially useful for microwave and optical integrated circuits where fabrication is often done in a layered structure. Furthermore, at some layer interfaces, very thin surfaces such as good conductor surfaces and metasurfaces can be deposited to achieve desired properties such as high absorbance and/or anomalous reflection/refraction. In this work, the 3D SNMM method is further extended from a single interface to multiple layers so that the electromagnetic propagation and scattering in the longitudinal direction is treated analytically through reflection and transmission matrices by using the eigenmode expansions in the transverse directions. Therefore, it effectively reduces the original 3D problem into a series of 2D eigenvalue problems for periodic structures. We apply this method to characterize metasurfaces and lithography models, and show that the SNMM method is especially efficient when the longitudinal layer thicknesses are large compared with wavelength. Numerical experiments indicate that the SNMM method is highly efficient and accurate for the metasurfaces and the lithography models.Index Terms-Bloch (Floquet) periodic eigenmodes, lithography, metasurface, mixed spectral element method, spectral numerical mode-matching method.

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“…In the numerical simulations, graphene ribbons were modeled as equivalent two-dimensional surface impedance layers with Z g = 1 /σ g without thickness [ 34 , 35 ] and the finite element method-based frequency domain solver of the commercial software CST Studio was used to study the properties of the absorbers. The absorbance of the absorbers is defined as A = 1− T – R , where reflectance R = | S 11 | 2 , transmission T = | S 21 | 2 , and S denotes the scattering parameter, respectively [ 20 ]. In addition, the theoretical and experimental available Fermi level μ c of graphene can be easily tuned from 0 to 1.0 eV via chemical or electrostatic doping [ 29 , 36 , 37 ], making it possible to achieve flexible control of the absorbance properties of the absorbers.…”

Section: Geometric Configurations Of the Absorbersmentioning

confidence: 99%

“…Since graphene possesses the ability to support long propagation and strongly localized surface plasmon polaritons (LSPPs) in the terahertz and infrared regions, it has become an excellent electromagnetic film material widely used in various terahertz components and devices [ 13 , 14 , 15 ]. To date, many graphene-based MAs have been proposed and investigated in a wide frequency spectrum ranging from microwave to ultraviolet light [ 16 , 17 , 18 , 19 , 20 ]. Via the chemical or electrostatic doping of graphene, both strong absorption and flexible tunability can be easily achieved.…”

Section: Introductionmentioning

confidence: 99%

Frequency-Reconfigurable Wide-Angle Terahertz Absorbers Using Single- and Double-Layer Decussate Graphene Ribbon Arrays

Zeng

Zhang

et al. 2018

Nanomaterials

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We propose and numerically demonstrate two novel terahertz absorbers made up of periodic single- and double-layer decussate graphene ribbon arrays. The simulated results show that the proposed absorbers have narrowband near-unity terahertz absorption with ultra-wide frequency reconfiguration and angular stability. By tuning the Fermi level of graphene ribbons, the over 90% absorbance peak frequency of the absorber with single-layer graphene structure can be flexibly adjusted from 6.85 to 9.85 THz for both the transverse magnetic (TM) and transverse electric (TE) polarizations. This absorber with single-layer graphene demonstrates excellent angular stability with the absorbance peaks of the reconfigurable absorption bands remaining over 99.8% in a wide angle of incidence ranging from 0 to 70°. The tuning frequency can be significantly enhanced by using the absorber with double-layer graphene structure from 5.50 to 11.28 THz and 5.62 to 10.65 THz, approaching two octaves under TM and TE polarizations, respectively. The absorbance peaks of the reconfigurable absorption band of this absorber for both polarizations maintain over 70%, even at a large angle of incidence up to 70°. Furthermore, an analytical fitting model is also proposed to accurately predict the absorbance peak frequencies for this variety of absorbers. Benefitting from these attractive properties, the proposed absorber may have great potential applications in tunable terahertz trapping, detecting, sensing, and various terahertz optoelectronic devices.

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Near unity ultraviolet absorption in graphene without patterning

Cited by 52 publications

References 28 publications

Strong Light–Matter Interaction in Lithography-Free Planar Metamaterial Perfect Absorbers

Strong Light–Matter Interaction in Lithography-Free Planar Metamaterial Perfect Absorbers

Spectral Numerical Mode-Matching Method for 3-D Layered Multiregion Structures

Frequency-Reconfigurable Wide-Angle Terahertz Absorbers Using Single- and Double-Layer Decussate Graphene Ribbon Arrays

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