Tunable broad-band perfect absorber by exciting of multiple plasmon resonances at optical frequency

Wang, Junqiao; Chen, Fan; Ding, Pei; He, Jian‐Jun; Cheng, Yongguang; Hu, Weiyan; Cai, Guo‐Ping; Liang, Erjun; Xue, Qianzhong

doi:10.1364/oe.20.014871

Cited by 147 publications

(73 citation statements)

References 34 publications

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“…In particular, with respect to perfect absorbers, various schemes have been suggested in order to achieve strong absorption in gigahertz [14] [25]. However, such methods often result in complex, bulky configurations, with little tunability.…”

Section: Introductionmentioning

confidence: 99%

Self-Affine Graphene Metasurfaces for Tunable Broadband Absorption

Papasimakis

Tsai

2016

Phys. Rev. Applied

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Graphene has emerged as a promising platform for THz metasurfaces supporting electrically tunable deep-subwavelength plasmonic excitations. Here, we introduce a broadband graphene metasurface based on the Hilbert curve, a continuous, space-filling fractal. We demonstrate enhancement of graphene absorption over a broad frequency band (0.5-60 THz) with an average absorption level exceeding 20%. Owing to the continuous nature of the metasurface patterns, both absorption level and bandwidth can be controlled electrically by varying the graphene charge carrier concentration.Keywords: graphene plasmonics, fractal metasurfaces, broadband absorber 2 Structuring materials [1][2][3][4] at the subwavelength scale has led to the emergence of metamaterials [5][6][7], a paradigm shift in the design of artificial electromagnetic materials [8] resulting in technologically important, as well as exotic, applications, including perfect lenses [9], transformation optics and invisibility cloaks [10], and perfect absorbers [11]. The properties of metamaterials largely arise from resonant dispersion; hence material loss restricts the strength [12] and bandwidth of the metamaterial response [13].In particular, with respect to perfect absorbers, various schemes have been suggested in order to achieve strong absorption in gigahertz [14] [25]. However, such methods often result in complex, bulky configurations, with little tunability. Graphene, a monolayer of carbon atoms, provides an appealing alternative: owing to its band structure, graphene supports plasmonic excitations at the deep sub-wavelength scale [26]. Plasmonic resonators can be realized by structuring graphene at the nanoscale [27][28][29], which can then be employed to construct graphene metasurfaces targeting the THz part of the spectrum [30][31][32][33][34]. At the same time the high sensitivity of the electromagnetic properties of graphene to the charge carrier [35] concentration provides means of electrical control of plasmons [36][37][38]. In 3 addition to tunability, graphene as a plasmonic material allows to strongly confine electromagnetic radiation to much smaller physical volumes compared to typical metals.For example, the plasmon wavelength for graphene is about 50 times smaller than the free-space wavelength, while for noble metals this is an order of magnitude smaller [26,29]. Such strong field confinement allows people to realize very complex graphene structures while retaining a subwavelength footprint. Graphene exhibits broadband nonlinearities and high thermal conductivity, whereas its atomic thickness facilitates device integration.Here, we introduce fractal graphene metasurfaces as tunable, broadband THz absorbers of monoatomic thickness (see Fig. 1(a)). We demonstrate multifold enhancement of absorption over an extremely broad frequency band, where average absorption levels exceed 20% from 0.5 to 60 THz in strongly doped graphene. We show that the absorption band is strongly dependent on the charge carrier concentration enabling dynamic electrosta...

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Section: Introductionmentioning

confidence: 99%

Self-Affine Graphene Metasurfaces for Tunable Broadband Absorption

Papasimakis

Tsai

2016

Phys. Rev. Applied

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“…1 Afterward, different metamaterial absorbers were designed at different frequency regimes. [2][3][4][5][6][7][8][9] For the sake of practical applications, metamaterial absorber with band enhanced absorption has drawn great research interests from the academic community. Researchers proposed many methods of broadening the absorption band.…”

Section: Introductionmentioning

confidence: 99%

A band enhanced metamaterial absorber based on E-shaped all-dielectric resonators

Li-yang

Wang

et al. 2015

AIP Advances

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In this paper, we propose a band enhanced metamaterial absorber in microwave band, which is composed of high-permittivity E-shaped dielectric resonators and metallic ground plate. The E-shaped all-dielectric structure is made of high-temperature microwave ceramics with high permittivity and low loss. An absorption band with 1 GHz bandwidth for both TE and TM polarizations are observed. Moreover, the absorption property is stable under different incident angles. The band enhanced absorption is caused by different resonant modes which lie closely in the absorption band. Due to the enhanced localized electric/magnetic fields at the resonant frequencies, strong absorptions are produced. Our work provides a new method of designing high-temperature and high-power microwave absorbers with band enhanced absorption.

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“…Metamaterial absorbers (MMAs) are arrays of patterned metal-insulator-metal (MIM) structures that have almost perfect absorption for certain wavelengths where their impedances are perfectly matched to that of air near the resonant wavelengths. Nearly perfect MMAs are demonstrated in the microwave [10][11][12], terahertz [13,14], infrared (IR) [15][16][17][18][19][20][21][22][23] and visible regimes [24][25][26][27][28][29][30]. Metamaterial absorbers in the visible spectrum can be realized using nanoparticles on a thick metallic ground plane separated with a dielectric spacer [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…Multiplexing different resonator structures in a unit cell is a route to obtain multispectral absorption which requires precise control of dimensions of multiple nanostructures [11,[37][38][39][40][41][42][43]. Multispectral MMAs based on simultaneous excitation of electric and magnetic plasmon modes are the least exploited structures [28,44,45]. MMAs are usually fabricated by using electron beam (e-beam) or optical lithography which typically result in structures slightly different from the design.…”

Section: Introductionmentioning

confidence: 99%

Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers

Ayas¹,

Bakan²,

Dâna³

2015

Opt. Express

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Multispectral metamaterial absorbers based on metal-insulatormetal nano-square patch resonators are studied here. For a geometry consisting of perfectly nano-square patches and vertical sidewalls, double resonances in the visible regime are observed due to simultaneous excitation of electric and magnetic plasmon modes. Although slightly modifying the sizes of the square patches makes the resonance wavelengths simply shift, rounding corners of the square patches results in emergence of a third resonance due to excitation of the circular cavity modes. Sidewall angle of the patches are also observed to affect the absorption spectra significantly. Peak absorption values for the triple resonance structures are strongly affected as the sidewall angle varies from 90 to 50 degrees. Rounded corners and slanted sidewalls are typical imperfections for lithographically fabricated metamaterial structures. The presented results suggest that imperfections caused during fabrication of the top nanostructures must be taken into account when designing metamaterial absorbers. Furthermore, it is shown that these fabrication imperfections can be exploited for improving resonance properties and bandwidths of metamaterials for various potential applications such as solar energy harvesting, thermal emitters, surface enhanced spectroscopies and photodetection.

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Tunable broad-band perfect absorber by exciting of multiple plasmon resonances at optical frequency

Cited by 147 publications

References 34 publications

Self-Affine Graphene Metasurfaces for Tunable Broadband Absorption

Self-Affine Graphene Metasurfaces for Tunable Broadband Absorption

A band enhanced metamaterial absorber based on E-shaped all-dielectric resonators

Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers

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