High-Sensitivity Terahertz Refractive Index Sensor in a Multilayered Structure with Graphene

Tang, Jiao; Ye, Yunyang; Xu, Jiao; Zhang, Zheng; Jin, Xiangliang; Jiang, Leyong; Jiang, Jie; Xiang, Yuanjiang

doi:10.3390/nano10030500

Cited by 27 publications

(13 citation statements)

References 40 publications

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“…On the other hand, if the BDS is simply added on top of the photonic crystal, the semimetallic properties of the BDS and the presence of the DBR will allow the excitation conditions of the OTS

to be satisfied and thus manifest the new reflected peak, as shown by the yellow double-dotted line in Figure 2 a. It is easy to see that this reflected peak has a wider full width at half maxima (FHWM) compared to the reflected peak of the defect mode, and therefore, its sensitivity is relatively low when used alone for biosensing [ 36 ]. The above limitations are significantly improved with the introduction of both BDS and defect layers and with appropriate parameter settings.…”

Section: Resultsmentioning

confidence: 99%

Terahertz Biosensor Based on Mode Coupling between Defect Mode and Optical Tamm State with Dirac Semimetal

Bao

Ren

et al. 2022

Biosensors

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Bulk Dirac semimetal (BDS) has emerged as a “3D graphene” material for the development of optical devices in the past few years. In this study, a BDS-based tunable highly sensitive terahertz (THz) biosensor is proposed by using a Dirac semimetal/Bragg reflector multilayer structure. The high sensitivity of the biosensor originates from the sharp Fano resonance peak caused by coupling the Optical Tamm State (OTS) mode and defect mode. Besides, the sensitivity of the proposed structure is sensitive to the Fermi energy of Dirac semimetal and the refractive index of the sensing medium. The maximum sensitivity of 1022°/RIU is obtained by selecting structural and material parameter appropriately, which has certain competitiveness compared to conventional surface plasmon resonance (SPR) sensors. From the standpoint of the fabrication facility and integration, we judged that the BDS-based layered structure has the potential application in biosensor field.

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“…On the other hand, if the BDS is simply added on top of the photonic crystal, the semimetallic properties of the BDS and the presence of the DBR will allow the excitation conditions of the OTS

Section: Resultsmentioning

confidence: 99%

Terahertz Biosensor Based on Mode Coupling between Defect Mode and Optical Tamm State with Dirac Semimetal

Bao

Ren

et al. 2022

Biosensors

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“…Tang et al [ 83 ] proposed a highly sensitive optical biochemical sensor at terahertz frequency, in which a sensing medium is sandwiched between a composite structure containing a one-dimensional photonic crystal and graphene, consisting of TPX/SIO 2 as a substrate, with a single layer of graphene film inserted between the vertical structures as shown in Fig. 7 .…”

Section: Terahertz Metamaterials Sensing Detection Indexmentioning

confidence: 99%

Section: Terahertz Metamaterials Sensing Detection Indexmentioning

confidence: 99%

Advances in terahertz metasurface graphene for biosensing and application

Yang

You

2023

Discover Nano

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Based on the extraordinary electromagnetic properties of terahertz waves, such as broadband, low energy, high permeability, and biometric fingerprint spectra, terahertz sensors show great application prospects in the biochemical field. However, the sensitivity of terahertz sensing technology is increasingly required by modern sensing demands. With the development of terahertz technology and functional materials, graphene-based terahertz metasurface sensors with the advantages of high sensitivity, fingerprint identification, nondestructive and anti-interference are gradually gaining attention. In addition to providing ideas for terahertz biosensors, these devices have attracted in-depth research and development by scientists. An overview of graphene-based terahertz metasurfaces and their applications in the detection of biochemical molecules is presented. This includes sensor mechanism research, graphene metasurface index evaluation, protein and nucleic acid sensors, and other chemical molecule sensing. A comparative analysis of graphene, nanomaterials, silicon, and metals to develop material-integrated metasurfaces. Furthermore, a brief summary of the main performance results of this class of devices is presented, along with suggestions for improvements to the existing shortcoming.

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“…where n is the unit of the surface normal and J is the surface current density of the graphene. Subsequently, by applying the above boundary conditions at z = 0 [36],…”

Section: Structure and Theoretical Modelingmentioning

confidence: 99%

Plasmonics in the visible domain for a one-dimensional truncated photonic crystal terminated by graphene: sensing beyond Dirac point's approximation

Ghatar,

Jahani,

Fritzche

et al. 2021

Preprint

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Visible surface plasmon resonances (SPRs) could be excited by TE wave polarization in onedimensional photonic crystals (PCs) coated by a graphene layer under the Kretschmann configuration. In this work, the plasmonic Bloch wave properties beyond Dirac points in a one-dimensional graphene-based photonic sensing structure have been numerically studied. We demonstrate that emergent plasmonic dips in the reflectance spectra of the suggested photonic device in the visible region exhibit tunable characteristics upon modulation of the chemical potential and the hopping parameter. The sensitivity of the sensor in the visible domain has been numerically evaluated and also was compared with those considering the surface plasmon resonances in the terahertz regime.

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High-Sensitivity Terahertz Refractive Index Sensor in a Multilayered Structure with Graphene

Cited by 27 publications

References 40 publications

Terahertz Biosensor Based on Mode Coupling between Defect Mode and Optical Tamm State with Dirac Semimetal

Terahertz Biosensor Based on Mode Coupling between Defect Mode and Optical Tamm State with Dirac Semimetal

Advances in terahertz metasurface graphene for biosensing and application

Plasmonics in the visible domain for a one-dimensional truncated photonic crystal terminated by graphene: sensing beyond Dirac point's approximation

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