Enhancement of near-infrared absorption in graphene with metal gratings

Zhao, Bo; Zhao, Jiupeng; Zhang, Z. M.

doi:10.1063/1.4890624

Cited by 208 publications

(141 citation statements)

References 28 publications

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“…Clearly, adding graphene can increase the peak absorptance significantly without shifting the peak locations. For a plain grating, the absorptance is only 0.21 at MP1, because of the weak coupling between the two side walls of in the trench as noted previously [38,42]. Higher absorptance of 0.66 and 0.57 can be obtained with the MP2 and SPP modes, respectively.…”

Section: A Absorptance Of Plain and Graphene-covered Gratingsmentioning

confidence: 89%

“…The power dissipation can then be estimated by replacing the period Λ in the RHS of Eq. (7) with the trench width b [38].…”

Section: Numerical Modelingmentioning

confidence: 99%

“…(4) can be incorporated into the RCWA algorithm to calculate the local absorption [38,45,46]. The absorptance of graphene can then be obtained from the ratio of the power dissipated inside graphene over the incident power; hence [38],…”

Section: Numerical Modelingmentioning

confidence: 99%

“…However, the enhancement achieved by this mechanism is usually narrowband and highly directionally sensitive. Recently, the present authors [38] proposed utilizing magnetic polaritons (MPs) in deep metal gratings to enhance absorptance of graphene and showed that up to near 0.70 absorptance in graphene can be obtained because of the enhanced electromagnetic field created when MPs are excited. However, the directional dependence as well as the effects of higher-order MPs and surface plasmon polaritons (SPPs) on graphene absorption have not been fully characterized.…”

Section: Introductionmentioning

confidence: 98%

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Resonance enhanced absorption in a graphene monolayer using deep metal gratings

Zhao

Zhang

2015

J. Opt. Soc. Am. B

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It has been demonstrated recently that metal gratings can significantly improve the near-infrared absorptance of graphene from 0.023 to nearly 0.70 because of the excitation of magnetic polaritons (MPs). In the present study, it is shown that the absorptance of graphene can be further enhanced to more than 0.80 by surface plasmon polaritons (SPPs) enabled by the grating. Meanwhile, graphene behaves as a sheet resistor that is able to boost the absorption when MPs or SPPs are excited without changing their resonance frequencies or dispersion relations. The effects of higher-order MPs, as well as the grating geometry on the enhanced absorptance, are also examined. Rigorous coupled-wave analysis (RCWA) is employed to calculate the radiative properties and power dissipation density in both the graphene and the metal grating. This study will facilitate the understanding of the coupling phenomena between graphene and nanostructures and may also benefit the design of next-generation graphenebased optical and optoelectronic devices.

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Section: A Absorptance Of Plain and Graphene-covered Gratingsmentioning

confidence: 89%

“…The power dissipation can then be estimated by replacing the period Λ in the RHS of Eq. (7) with the trench width b [38].…”

Section: Numerical Modelingmentioning

confidence: 99%

Section: Numerical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Resonance enhanced absorption in a graphene monolayer using deep metal gratings

Zhao

Zhang

2015

J. Opt. Soc. Am. B

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“…The frequency-dependent surface conductivity for graphene can be expressed as a sum of two terms that can be quantitatively described by the wellknown Kubo formula [10,27,28] …”

Section: Formulation Of the Basic-proposed Modal Form Electronic And mentioning

confidence: 99%

Tunable Properties of Surface Plasmon Resonance of Metal Nanospheroid: Graphene Plasmon Interaction

Bhardwaj

Pathak

et al. 2016

Plasmonics

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Graphene plasmonic resonances play a significant role for enhancing the photon absorption inside thin film solar devices. We investigate the field rising at the intersection of graphene physics and plasmonics followed by analytical methods in visible domain. The electromagnetic signature of oblate-shaped silver and gold nanoparticles (smaller size) with graphene-supported silicon substrate are analyzed under the quasi-static approximation. The results show that the magnitude of scattering and surface plasmon resonances depend on the aspect ratio, semi major axis length, and thickness of graphene monolayer. We also analyzed the wavelengthdependent photon absorption spectrum for optimized thickness (1 nm) of graphene monolayer with aspect ratio (0.328) of silver and gold nanoparticles under the AM1.5 solar spectrum.

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A Multibeam Interference Model for Analyzing Complex Near‐Field Images of Polaritons in 2D van der Waals Microstructures

Liao

Guo

et al. 2019

Adv Funct Materials

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Van der Waals (vdW) materials are among the most promising candidates for photonic integrated circuits because they support a full set of polaritons that can manipulate light at deep subdiffraction nanoscale. It is possible to directly probe the propagating polaritons in vdW materials in real space via scattering-type scanning near-field optical microscopy, such that the wave vector and lifetime of the polaritons can be extracted from as-measured interference fringes by Fourier analysis. However, this method is unsuitable for clutter interference patterns in samples exhibiting inadequate fringes due to small size (less than 10 µm) or complex edges that are often encountered in nanophotonic devices and new material characterization. Here, a multibeam interference model is developed to analyze complex images by disentangling them into periodic patterns and residue. By employing phase stationary approximation, polariton wave vector can be derived from offset ratio of the center point, and the ratio of polariton reflection and scattering rates at the edge is obtained from the ratio of the periodic and aperiodic patterns. This method can be widely used in the optical characterization of new vdW materials that are difficult to synthesize into large crystals, as well as nanophotonic integrated devices with unique boundaries.

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Enhancement of near-infrared absorption in graphene with metal gratings

Cited by 208 publications

References 28 publications

Resonance enhanced absorption in a graphene monolayer using deep metal gratings

Resonance enhanced absorption in a graphene monolayer using deep metal gratings

Tunable Properties of Surface Plasmon Resonance of Metal Nanospheroid: Graphene Plasmon Interaction

A Multibeam Interference Model for Analyzing Complex Near‐Field Images of Polaritons in 2D van der Waals Microstructures

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