Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

Teng, Da; Wang, Kai

doi:10.3390/nano11010210

Cited by 25 publications

(10 citation statements)

References 72 publications

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“…The Fermi level of graphene can be adjusted in order to obtain a peak absorptive wavelength [20] as per the user's requirement. In addition, graphene has the potential to excite surface plasmon effects [21]. The surface conductivity of graphene can be estimated using Kubo's formula [22], which includes inter-band and intra-band parts, such as:…”

Section: Sensor Design 21 Constructionmentioning

confidence: 99%

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Refractive Index-Based Terahertz Sensor Using Graphene for Material Characterization

Veeraselvam¹,

Alsath²,

Savarimuthu³

et al. 2021

Sensors

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In this paper, a graphene-based THz metamaterial has been designed and characterized for use in sensing various refractive index profiles. The proposed single-band THz sensor was constructed using a graphene-metal hybridized periodic metamaterial wherein the unit cell had a footprint of 1.395λeff × 1.395λeff and resonated at 4.4754 THz. The realized peak absorption was 98.88% at 4.4754 THz. The sensitivity of the proposed metamaterial sensor was estimated using the absorption characteristics of the unit cell. The performance of the sensor was analyzed under two different categories, viz. the random dielectric loading and chemical analytes, based on the refractive index. The proposed THz sensor offered a peak sensitivity of 22.75 GHz/Refractive Index Unit (RIU) for the various sample loadings. In addition, the effect of the sample thickness on the sensor performance was analyzed and the results were presented. From the results, it can be inferred that the proposed metamaterial THz sensor that was based on a refractive index is suitable for THz sensing applications.

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Section: Sensor Design 21 Constructionmentioning

confidence: 99%

“…The absorption frequency of the graphene-based THz sensor could be controlled using the external voltage bias (V DC ), which altered the Fermi level of the graphene material. The Fermi energy (E f ) of the graphene was related to the V DC using Equation ( 8) [21]:…”

Section: Influence Of External Biasmentioning

confidence: 99%

Refractive Index-Based Terahertz Sensor Using Graphene for Material Characterization

Veeraselvam¹,

Alsath²,

Savarimuthu³

et al. 2021

Sensors

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show abstract

“…A possible solution to this problem can be realized by using relatively advanced plasmonic structures. Some recent studies have shown the possibility of actively manipulating the spin and orbital angular momentums at THz frequencies by using graphene-based hybrid plasmonic waveguide structures [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

THz Multi-Mode Q-Plate with a Fixed Rate of Change of the Optical Axis Using Form Birefringence

2022

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We report the design, fabrication and experimental validation of a THz all-dielectric multi-mode q-plate having a fixed rate of change of the optical axis. The device consists of space-variant birefringent slabs manufactured by 3D printing using melt-extruded Acrylonitrile Butadiene Styrene (ABS). The desired form birefringence is analytically evaluated and experimentally measured by the THz time domain spectroscopy technique. The manufactured q-plate design is characterized using a polarization-sensitive imaging setup. The full electric field spatial maps are acquired from the beam propagating through the q-plate. The device enables the realization of both radial and azimuthal vector beams at discrete frequency intervals by controlling the space-dependent orientation of the ordinary and extraordinary axes in the transverse plane with a multi-mode sequence.

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“…Benefiting from these excellent characteristics, graphene has served as an effective nanoscale waveguiding platform in the infrared region. More importantly, the combination of graphene and silicon-on-insulator (SOI) waveguides make it possible to design graphene-based photonic integration devices [ 32 ], such as waveguides [ 33 , 34 , 35 , 36 , 37 , 38 , 39 ], sensors [ 40 , 41 ], filters [ 42 ], modulators [ 43 , 44 ], etc. Recently, graphene–SiO 2 –Si coaxial-like waveguides [ 45 ], graphene layer–SiO 2 –Si planar structures [ 46 , 47 , 48 , 49 , 50 ], and graphene-coated nanowires integrated with SiO 2 or Si substrates [ 51 , 52 , 53 , 54 , 55 , 56 ] were presented to demonstrate ultra-compact photonic integrated circuits in the mid- and far-infrared bands.…”

Section: Introductionmentioning

confidence: 99%

Symmetric Graphene Dielectric Nanowaveguides as Ultra-Compact Photonic Structures

Teng

Wang

et al. 2021

Nanomaterials

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A symmetric graphene plasmon waveguide (SGPWG) is proposed here to achieve excellent subwavelength waveguiding performance of mid-infrared waves. The modal properties of the fundamental graphene plasmon mode are investigated by use of the finite element method. Due to the naturally rounded tips, the plasmon mode in SGPWG could achieve a normalized mode field area of ~10−5 (or less) and a figure of merit over 400 by tuning the key geometric structure parameters and the chemical potential of graphene. In addition, results show that the modal performance of SGPWG seems to improve over its circular counterparts. Besides the modal properties, crosstalk analysis indicates that the proposed waveguide exhibits extremely low crosstalk, even at a separation distance of 64 nm. Due to these excellent characteristics, the proposed waveguide has promising applications in ultra-compact integrated photonic components and other intriguing nanoscale devices.

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Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

Cited by 25 publications

References 72 publications

Refractive Index-Based Terahertz Sensor Using Graphene for Material Characterization

Refractive Index-Based Terahertz Sensor Using Graphene for Material Characterization

THz Multi-Mode Q-Plate with a Fixed Rate of Change of the Optical Axis Using Form Birefringence

Symmetric Graphene Dielectric Nanowaveguides as Ultra-Compact Photonic Structures

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