A Tunable Terahertz Metamaterial Absorber Composed of Hourglass-Shaped Graphene Arrays

Qi, Yunping; Zhang, Yu; Liu, Chuqin; Zhang, Ting; Zhang, Baohe; Wang, Liyuan; Deng, Xiangyu; Wang, Xiangxian; Yu, Yang

doi:10.3390/nano10030533

Cited by 42 publications

(18 citation statements)

References 60 publications

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“…For detection of gas, Liedberg [1] and Nylander [2] recommended the utilization of SPR, for example, one dimensional Au grating gas sensor with 599 nm/RIU was reported to detect the RI [22]. [30,31].…”

Section: Background Historymentioning

confidence: 99%

Investigation of Surface Plasmon Polaritons based Gas sensor: Far and Near field Analysis

Afsheen

Iqbal

Khalid

et al. 2021

Preprint

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This research work reports the plasmonic-based biosensing using attenuated total reflection (ATR). A photon beam falls on the metallic film through an angle higher than critical angle of glass. SPPs are produced along the metal/analyte interface. An optimum gold (Au) film has been used to sense the refractive index of analyte lying next to it while utilizing the sensitivity power of electric field of the surface plasmon polaritons (SPPs). Such Nanoplasmonic devices have been designed and optimized utilizing finite element analysis (FEA) in licensed version of COMSOL 5.4, RF module. Reflection spectra have been extracted for far-field analysis, whereas shift in the position of SPP dip has been exploited to compute sensitivity of the device. By controlling the film thickness and angle of light incidence, the sensitivity of the device is enhanced. It is worth mentioning that the spectral range was brought in visible region where most of the practical devices work very well. The sensitivity of 18200 nm/RIU has been achieved for optimum angle and gold film thickness. Hence such devices have various sensing applications in medical diagnostics.

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Section: Background Historymentioning

confidence: 99%

Investigation of Surface Plasmon Polaritons based Gas sensor: Far and Near field Analysis

Afsheen

Iqbal

Khalid

et al. 2021

Preprint

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“…Encapsulating a good absorption with near-unity is highly dependent on the physical dimension of a structure and the resonator. Many resonator structure like helix-shape [101], saw tooth [102], tapped array [103], circular-sector [104], hourglass-shape [105], coin-shaped [106], arrow-shaped [107], meander ring [108], circular-split-ring [109].…”

Section: B Design Of the Unit Cell Structurementioning

confidence: 99%

A Wide Incident Angle, Ultrathin, Polarization-Insensitive Metamaterial Absorber for Optical Wavelength Applications

et al. 2020

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Polarization-insensitive metamaterial absorbers (MMAs) are currently attracting a great deal of interest throughout the optical region. These kinds of MMAs can be used as energy harvesting, thermal imaging, plasmonic sensor, magnetic imaging, light trapping, optical modulator, and can help to decipher an inherence for the field. Here, a polarization-insensitive ultrathin MMA has been proposed with an extensive incident angular stability for the optical region with a sandwiched three-layer structure. Tungsten (W) and silicon dioxide (SiO2) have been chosen as materials for their various advantages in the optical spectrum with higher temperature stability. The design simulated with the finite integration technique (FIT), and validation of the simulated data is assured with the interference theory model (ITM). Underlying physics of the absorption characteristics and performance of the structure are immensely explained. The design acquired an average absorption of 96.7% from 380nm to 700nm and 96.61% for both transverse electric (TE) and transverse magnetic (TM) polarization. It has a peak absorption of 99.99% at 498.25nm, and over 99% from 460nm to 540nm, due to a very good impedance match with plasmonic resonance characteristics. For both TE and TM mode, it has wide angular independence up to 60⁰, which can be used for solar cell and solar thermo-photovoltaics (STPV). The various parametric sweep also analyzed for acquiring the geometric shape with a wide bandwidth to find resonance wavelength. As the MMA shifts its resonance wavelength with the change of its dielectric thickness, it can be used as an optical sensor. Changing dielectric in a Pyrex will enable the structure to be used as a light detector. Such outstanding absorption properties render the proposed MMA a successful candidate for the optical wavelength applications mentioned above. INDEX TERMS polarization-insensitive, metamaterial absorber, incident angular stability, impedance match, plasmonic resonance characteristics.

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“…Compared with the traditional polarizers, the new polarizers based on the metasurface overcome the shortcomings of the traditional way and exhibit a lot of excellent performances in the manipulation and application of electromagnetic waves [14][15][16][17][18][19][20][21][22][23], which has attracted extensive attention of academia and industry.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Broadband Polarization Conversion Meta-Surface and its Application in Polarization Converter and RCS Reduction

Zhang

Liu

et al. 2020

IEEE Access

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In this paper, an ultra-broadband and high-efficiency polarization conversion metasurface is presented in the terahertz region. The metasureface is similar to a sandwiched structure, which is composed of the top Double Split Ring Resonator (DSRR), an intermediate dielectric layer and a bottom metal layer. Both numerical simulation and theoretical calculation results demonstrate that the proposed metasurface can convert linearly co-polarized waves into cross-polarized waves in the frequency from 2.04 THz to 5.33 THz with a relative bandwidth of 89% and the polarization conversion ratio (PCR) is over 90%. Further simulation results show that the proposed metasurface is insensitive to the polarization angle, and the physical mechanism is revealed in detail by the surface current distribution. In addition, two different kinds of 2-bit coding metasurfaces are designed based on the Pancharatnam-Berry (PB) Phase. The simulated and calculated results show that the proposed PB-coding metasurface has excellent performance in flexibly controlling terahertz wave reflection and low Radar Cross Section (RCS). A 10dB RCS reduction can be achieved from 1.9 THz to 5.5 THz under normal incidence. It provides new degrees of freedom for studying terahertz wave manipulation and reducing RCS.

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A Tunable Terahertz Metamaterial Absorber Composed of Hourglass-Shaped Graphene Arrays

Cited by 42 publications

References 60 publications

Investigation of Surface Plasmon Polaritons based Gas sensor: Far and Near field Analysis

Investigation of Surface Plasmon Polaritons based Gas sensor: Far and Near field Analysis

A Wide Incident Angle, Ultrathin, Polarization-Insensitive Metamaterial Absorber for Optical Wavelength Applications

Ultra-Broadband Polarization Conversion Meta-Surface and its Application in Polarization Converter and RCS Reduction

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