Theoretical T Circuit Modeling of Graphene-Based Metamaterial Broadband Absorber

Huang, Fujuan; Fu, Yongqi

doi:10.1007/s11468-016-0299-x

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…To overcome this problem, various physical mechanisms [ 18 – 43 ] to enhance absorption of graphene in the visible region have been proposed, which include strong photon localization on the defect layer in one-dimensional (1D) photonic crystals [ 18 , 28 , 33 , 38 ], total internal reflection [ 19 , 20 , 23 , 27 ], surface plasmon resonances [ 21 , 22 , 30 , 31 , 33 ], evanescent diffraction orders of the arrays of metal nanoparticles [ 34 ], and critical coupling to guided mode resonances [ 25 , 26 , 32 , 34 , 35 , 37 , 39 – 41 ]. Besides the absorption enhancement in graphene, achieving multiband and broadband light absorption in graphene is also important for some graphene-based optoelectronic devices from a practical point of view.…”

Section: Introductionmentioning

confidence: 99%

“…But, it is still a challenge, as pointed out in the very recent reports [ 44 – 46 ]. At present, different approaches have been proposed to broaden the bandwidth of graphene absorption in wide frequency range from THz [ 44 – 62 ] and infrared [ 63 – 65 ] to optical frequencies [ 19 , 23 , 29 , 31 , 34 – 36 , 38 – 40 , 43 ]. Especially, a multi-resonator approach was proven to be a very effective method to resolve the bandwidth limitation of graphene absorption in the THz and infrared regions [ 45 , 46 , 62 , 63 ].…”

Section: Introductionmentioning

confidence: 99%

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Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

et al. 2018

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It is well known that a suspended monolayer graphene has a weak light absorption efficiency of about 2.3% at normal incidence, which is disadvantageous to some applications in optoelectronic devices. In this work, we will numerically study multiband and broadband absorption enhancement of monolayer graphene over the whole visible spectrum, due to multiple magnetic dipole resonances in metamaterials. The unit cell of the metamaterials is composed of a graphene monolayer sandwiched between four Ag nanodisks with different diameters and a SiO2 spacer on an Ag substrate. The near-field plasmon hybridizations between individual Ag nanodisks and the Ag substrate form four independent magnetic dipole modes, which result into multiband absorption enhancement of monolayer graphene at optical frequencies. When the resonance wavelengths of the magnetic dipole modes are tuned to approach one another by changing the diameters of the Ag nanodisks, a broadband absorption enhancement can be achieved. The position of the absorption band in monolayer graphene can be also controlled by varying the thickness of the SiO2 spacer or the distance between the Ag nanodisks. Our designed graphene light absorber may find some potential applications in optoelectronic devices, such as photodetectors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

et al. 2018

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“…From the other horizon, owing to its exceptional electrical, electronics and optical properties, such as strong thermal power, wide carrier mobility, and extremely young module [56], have acquired considerable attention in the domain of the thin and lightweight metamaterial research. Graphene is a 2-dimensional, radioactive medium that offers electrical and optical control across a large spectrum of frequencies, such as THz [57][58][59] and GHz [60]. The graphene's conductivity can be managed by various parameters such as temperature, duration, dispersion rate, and chemical potential [58].…”

Section: Graphene-based Metamaterialsmentioning

confidence: 99%

Graphene-Based Nanophotonic Devices

Pandya¹,

Sorathiya²,

Lavadiya³

2020

Recent Advances in Nanophotonics - Fundamentals and Applications

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Graphene is an ideal 2D material that breaks the fundamental properties of size and speed limits by photonics and electronics, respectively. Graphene is also an ideal material for bridging electronic and photonic devices. Graphene offers several functions of modulation, emission, signal transmission, and detection of wideband and short band infrared frequency spectrum. Graphene has improved human life in multiple ways of low-cost display devices and touchscreen structures, energy harvesting devices (solar cells), optical communication components (modulator, polarizer, detector, laser generation). There is numerous literature is available on graphene synthesis, properties, devices, and applications. However, the main interest among the scientist, researchers, and students to start with the numerical and computational process for the graphene-based nanophotonic devices. This chapter also includes the examples of graphene applications in optoelectronics devices, P-N junction diodes, photodiode structure which are fundamental devices for the solar cell and the optical modulation.

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“… 12 demonstrated that the overall dimensions of MA can be designed to offer perfect absorption at microwave frequencies owing to the matched impedance to free space. Since then, lots of devices 13 – 16 have been proposed and studied from the microwave 17 to terahertz 18 regions in order to obtain perfect absorption 19 , polarization-insensitive 20 , wide angle 21 and tunability 22 . The single-band high absorption is unsuitable in practical applications 23 .…”

Section: Introductionmentioning

confidence: 99%

Design of broadband graphene-metamaterial absorbers for permittivity sensing at mid-infrared regions

Huang

Xia

Xie

et al. 2018

Sci Rep

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In this paper, a tunable broadband metamaterial absorber (MA) based on graphene is investigated theoretically and numerically at mid-infrared regions. Compared with the previously reported multiband graphene-based MAs, a broad bandwidth of 11.7 THz with the absorption over 90% is obtained in the proposed MA, which is composed of a Jerusalem cross (JC) metal encrusting into the slot graphene layer in the top layer. The results show that the origin of broadband absorption is caused by coupling effect between metal and graphene, and this effect is explained by the two-mode waveguide coupling theory. The tunability of MA is achieved via changing the external gate voltage to modify the Fermi energy of graphene. Further results show that the proposed MA can be used as the permittivity sensor with a high absorption. This work indicates that the proposed MA has the potential applications with respect to sensors and infrared absorbers.

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Theoretical T Circuit Modeling of Graphene-Based Metamaterial Broadband Absorber

Cited by 6 publications

References 28 publications

Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

Graphene-Based Nanophotonic Devices

Design of broadband graphene-metamaterial absorbers for permittivity sensing at mid-infrared regions

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