Sensitive chemical potential sensor based on graphene hyperbolic metamaterials

Wang, Yonghui; Wang, Yu; Ji, Zitao; Liang, W. Y.; Chen, Wuhe

doi:10.1209/0295-5075/130/27002

Cited by 10 publications

(3 citation statements)

References 49 publications

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“…Because of the open IFCs, HMMs support propagating EM waves with large wave vectors [101,238,239]. The capability of HMMs has been demonstrated in numerous applications that utilize their exotic highk modes, such as enhanced spontaneous emission [240][241][242][243][244][245][246], long-range interactions [247][248][249][250][251], super-resolution imaging [252][253][254][255], optical pulling forces [256,257] and highsensitivity sensors [258][259][260][261][262][263][264][265][266]. For electric/magnetic HMM, the principal components of its electric/magnetic tensor have opposite signs.…”

Section: Hyperbolic Metacavitiesmentioning

confidence: 99%

Zero-index and hyperbolic metacavities: fundamentals and applications

Guo

Jiang

Chen

2021

J. Phys. D: Appl. Phys.

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As a basic building block, optical resonant cavities (ORCs) are widely used in light manipulation. They can confine electromagnetic waves and improve the interaction between light and matter, which also plays an important role in cavity quantum electrodynamics, nonlinear optics and quantum optics. In recent years, the rise of metamaterials, artificial materials composed of subwavelength unit cells, has greatly enriched the design and functionality of ORCs. Here, we review zero-index hyperbolic metamaterials for constructing novel ORCs. First, this paper introduces the classification and implementation of zero-index hyperbolic metamaterials. Second, the distinctive properties of zero-index and hyperbolic cavities are summarized, including geometric invariance, homogeneous/inhomogeneous field distribution, topological protection (anomalous scaling law, size independence, continuum of higher-order modes, and dispersionless modes) for zero-index (hyperbolic) metacavities. Finally, the paper introduces some typical applications of zero-index and hyperbolic metacavities, and advances the research of metacavities.

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Section: Hyperbolic Metacavitiesmentioning

confidence: 99%

Zero-index and hyperbolic metacavities: fundamentals and applications

Guo

Jiang

Chen

2021

J. Phys. D: Appl. Phys.

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“…To investigate the behaviour of the propagation modes at the surface of the graphene layer, the dispersion relation of the propagation modes has been calculated based on eigenvalue solutions of Maxwell's equations for this structure. One of the main parameters that can change the characteristics of graphene is its CP [48]. Hence, the dispersion relation of the structure has been plotted for different CPs as presented in Fig.…”

Section: B the Analysis Of Surface Plasmonic Propagation In Graphenementioning

confidence: 99%

Surface Electromagnetic Performance Analysis of a Graphene-Based Terahertz Sensor Using a Novel Spectroscopy Technique

Amlashi

Khalily

Singh

et al. 2021

IEEE J. Select. Areas Commun.

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In this paper, a novel terahertz (THz) spectroscopy technique and a new graphene-based sensor is proposed.The proposed sensor consists of a graphene-based metasurface (MS) that operates in reflection mode over a broad range of frequency band (0.2 − 6 THz) and can detect relative permittivity of up to 4 with a resolution of 0.1 and a thickness ranging from 5 m to 600 m with a resolution of 0.5 m. To the best of author's knowledge, such a THz sensor with such capabilities has not been reported yet. Additionally, an equivalent circuit of the novel unit cell is derived and compared with two conventional grooved structures to showcase the superiority of the proposed unit cell. The proposed spectroscopy technique utilizes some unique spectral features of a broadband reflection wave including Accumulated Spectral power (ASP) and Averaged Group Delay (AGD), which are independent to resonance frequencies and can operate over a broad range of the spectrum. ASP and AGD can be combined to analyse the magnitude and phase of the reflection diagram as a coherent technique for sensing purposes. This enables the capability to distinguish between different analytes with high precision which, to the best of author's knowledge, has been accomplished for the first time.

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“…A graphene-based hyperbolic metamaterial has also been designed as THz antenna for cancer detection recently [56]. In our recent work, we reported zero reflection effect and further designed optical switches and chemical potential sensors in graphene HMMs [57,58]. It is expected that the fantastic dispersion relation of HMMs can also be used for flexible tunable directional emission over a broad bandwidth.…”

mentioning

confidence: 93%

Tunable directional emission based on graphene hyperbolic metamaterials

Ji¹,

Liang²,

Li³

2021

EPL

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We have studied the tunable properties of a hyperbolic metamaterial (HMM) composed of alternative dielectric layers and graphene sheets, and proposed a highly directional emission device working in the terahertz region. By changing the chemical potential μc, the equifrequency contour (EFC) of the HMM is easily switched between elliptical and hyperbolic types. Especially, when a dipole source is placed inside the structure, highly directional emission is realized provided that the EFC is a flat ellipse. Interestingly, such highly directional emission can be achieved for any frequency within a broad frequency range by tuning the chemical potential μc. The divergence angle of such a directional beam is lower than 12 • . Additionally, the influences of structural parameters (ε d and d ) on the working bandwidth are also studied. These results have potential in many fields such as light coupling and spontaneous radiation antennas.

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Sensitive chemical potential sensor based on graphene hyperbolic metamaterials

Cited by 10 publications

References 49 publications

Zero-index and hyperbolic metacavities: fundamentals and applications

Zero-index and hyperbolic metacavities: fundamentals and applications

Surface Electromagnetic Performance Analysis of a Graphene-Based Terahertz Sensor Using a Novel Spectroscopy Technique

Tunable directional emission based on graphene hyperbolic metamaterials

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