Electrically-modulated infrared absorption of graphene metamaterials via magnetic dipole resonance

Cao, Shuhua; Wang, Qi; Gao, Xufeng; Zhang, Shijie; Hong, Ruijing; Zhang, Dawei

doi:10.1016/j.physe.2021.115078

Cited by 10 publications

(8 citation statements)

References 46 publications

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“…This magnetic field can couple with the magnetic field component of incident light. This coupling results in the emergence of a magnetic dipole plasmon mode [39,40], which is enhanced and highly confined within the dielectric layer. The electromagnetic field profile presented in figure 2 provides compelling evidence that mode I emerges due to magnetic dipole plasmon resonance.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced dual-band absorption of graphene mediated by an aluminum metastructure

Khan¹,

Lü²,

Wang

2023

2D Mater.

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Graphene absorption from the visible to infrared spectrum has great potential and broad applications in the miniature of modern optoelectronic biosensors and photodetectors. However, graphene has zero bandgap energy, which limits its absorption to 2.3% in the visible and infrared spectrums. Here we propose a metastructure to optimize the graphene absorption in the visible to near-infrared frequency regions. The metastructure comprising an array of aluminium (Al) square blocks (Al-SBs) on a graphene layer, a silica spacer, and an Al reflector is investigated for absorption enhancement. This work deciphers the effect of the periodicity of decorated Al-SBs on the evolution of dual-band absorption in single layer graphene under normal incidence. Electromagnetic signatures of two excited modes indicate that surface plasmon and magnetic dipole plasmon are mediators of absorption. The investigation into the impact of geometrical parameters illustrates that the coexisting phenomena of a relative broad peak and a relative sharp peak have been achieved simultaneously with high efficiency. The dynamic manipulation of surface plasmon and magnetic dipole plasmon presents a great potential for a diverse range of applications such as sensing and imaging. By controlling the periodicity of Al-SBs, it is possible to achieve active control of surface plasmon resonance, and a detection range of 300 nm is observed. Dynamic control of the magnetic dipole plasmon successfully achieved by modifying the electrical environment of the graphene layer, which is realized by altering the underlying spacer material. Collectively, findings of this study demonstrate the significant potential of the suggested metastructure for its prospective applications in optoelectronic devices including biosensors, photovoltaics, and photodetectors that rely on the dynamic control of surface and magnetic plasmon resonances.

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Section: Resultsmentioning

confidence: 99%

“…These results indicate that mode I does not rely on the periodicity of Al-SBs, while mode II changes resonance wavelength as the diffracting wave vectors are modified by the periodicity of Al-SBs. Mode II is attributed to propagating surface plasmon resonance and peak shift is easily determined using the expression [40]…”

Section: Resultsmentioning

confidence: 99%

Enhanced dual-band absorption of graphene mediated by an aluminum metastructure

Khan¹,

Lü²,

Wang

2023

2D Mater.

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“…Graphene is an especially interesting material for THz applications due to its transparency, its conductivity controllable with current electronic technologies, and the wide spectral range of excitations it can sustain [12,[15][16][17][18][19][20][21]. The above reasons have driven the research of graphene plasmons amplification in different structures throughout the literature.…”

Section: Or Electrically By Charge Carriers Injection Into a Semicond...mentioning

confidence: 99%

Terahertz lasing conditions of radiative and nonradiative propagating plasmon modes in graphene-coated cylinders

Prélat¹,

Passarelli²,

Bustos-Marun³

et al. 2022

Preprint

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There is increasing interest in filling the gap of miniaturized terahertz/mid-infrared radiation sources and, particularly, in incorporating these sources into micro/nanophotonic circuits. By using rigorous electromagnetic methods, we investigate the lasing conditions and the electric-tunability of radiative and non radiative propagating surface-plasmon modes in cylinders made of active materials coated with a graphene layer. A detailed analysis of the lasing condition of different surface-plasmon modes shows that there is an abrupt change in the gain required when modes become nonradiative. Although radiative modes, subject to both radiation and ohmic losses, are expected to require more gain compensation than nonradiative modes, we find that, counterintuitively, gain compensation is greater for nonradiative modes. This is explained in terms of a change in the distribution of fields that occurs when the character of modes switches from plasmonic to photonic. Finally, we assess the feasibility of our proposal by using a realist gain medium and showing that a relatively low population inversion is required for the stimulated emission of the studied system.

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“…Under the condition of random-phase approximation, graphene has a complex surface conductivity s, which comprises the contributions of both the intraband term s , intra and the interband term s inter [46], as expressed by the following where e is the electron charge, = ´k J K 1. 38 ´-F m 8.85 10 0 12 / represents the permittivity of free space and d g defines the thickness of the graphene layer, which is assumed to be 0.34 nm in this work.…”

Section: The Radiation Properties Of Optimization Modelmentioning

confidence: 99%

Predictable infrared dual-band narrow-band absorber for infrared detection

Cui¹,

Lv²

2022

Nanotechnology

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Dual-band infrared absorbers have received a great deal of attention for their potential applications in the field of sensing and detection. In this paper, we proposed a composite model consisting of Platinum nano-cylinder and micro-ring column stacked on top of Si3N4 and Platinum films. The effect of geometrical parameters on spectral absorption was explored by FDTD methods, and the results revealed that there were narrow perfect absorption peaks in each of the two atmospheric window bands due to the magnetic polaritons. Meanwhile, the quantitative relationship of resonance wavelength and geometrical parameters were predicted by LC equivalent circuits. In addition, graphene was added to the structure to dynamically adjust the resonance wavelength by varying the Fermi level. The combination of graphene and microstructure achieved full coverage detection of wavelengths in the atmospheric window range. This dual-band absorber has potential applications in infrared detection because of its good absorption properties and its tunability.

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Electrically-modulated infrared absorption of graphene metamaterials via magnetic dipole resonance

Cited by 10 publications

References 46 publications

Enhanced dual-band absorption of graphene mediated by an aluminum metastructure

Enhanced dual-band absorption of graphene mediated by an aluminum metastructure

Terahertz lasing conditions of radiative and nonradiative propagating plasmon modes in graphene-coated cylinders

Predictable infrared dual-band narrow-band absorber for infrared detection

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