Sensing and slow light applications based on graphene metasurface in terahertz

Wang, Yixuan; Chang, Baosheng; Xue, Jingjing; Cao, Xiehong; Xu, Hui; He, Hui; Cui, Wei; He, Zhihui

doi:10.1016/j.diamond.2022.108881

Cited by 33 publications

(21 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sensitivity (S) is a critical parameter to measure the sensing performance, which can be expressed as [29]:…”

Section: Resultsmentioning

confidence: 99%

High-sensitive refractive index sensing and excellent slow light based on tunable triple plasmon-induced transparency in monolayer graphene based metamaterial

Zhou¹,

Xu²,

Li³

et al. 2022

Commun. Theor. Phys.

View full text Add to dashboard Cite

A patterned monolayer graphene metamaterial structure consisting of six graphene blocks and two graphene strips is proposed to generate triple plasmon-induced transparency (PIT). Triple-PIT can be effectively modulated by Fermi levels of graphene. The theoretical calculated results by coupled mode theory (CMT) show high matching degree with the numerical simulated results by finite-difference time-domain (FDTD). Intriguingly, the high-sensitive refractive index sensing and excellent slow-light performance can be realized in the proposed graphene metamaterial structure. The sensitivity (S) and figure of merit (FOM) can reach up to 5.7115 THz/RIU and 116.32, respectively. Moreover, the maximum group refractive index is 1036. Hence, these results may provide a new idea for designing graphene-based sensors and slow light devices.

show abstract

“…Sensitivity (S) is a critical parameter to measure the sensing performance, which can be expressed as [29]:…”

Section: Resultsmentioning

confidence: 99%

High-sensitive refractive index sensing and excellent slow light based on tunable triple plasmon-induced transparency in monolayer graphene based metamaterial

Zhou¹,

Xu²,

Li³

et al. 2022

Commun. Theor. Phys.

View full text Add to dashboard Cite

show abstract

“…Therefore, SPPs are considered to be one of the most advantageous candidates in integrated optical circuit, which has attracted much attentions from researchers. Some devices based on plasma structure have been researched, such as wavelength demultiplexers, slow light systems and filters [7][8][9]. However, the tuning of plasma structure depends mainly on changes in the size of the structure, which is difficult to change once the device is made.…”

Section: Introductionmentioning

confidence: 99%

Dynamic control of Fano-like interference in the graphene periodic structure

Liu

Wen

et al. 2023

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

We propose and investigate a graphene periodic subsurface structure consisting of a coplanar pair of ring resonators and a ribbon. The Fano-like interference can be actively regulated by the applied magnetic field, incident angle and Fermi energy. Since the excited charges of graphene monolayer have cyclotron properties in the external magnetic field, the transmittance and line-shape can be effectively controlled. At a certain frequency, different magnetic fields have different effects on the conductivity tensor of graphene, which affects the metallic properties of graphene, leading to changes in the transmittance. The Fano-like line-shape can be regulated by adjusting the incident angle to delay the phase between adjacent graphene sheets. In addition, the resonance frequency can be electrically regulated through Fermi energy. Finite element method (FEM) is introduced to analyze the graphene periodic structure and the results are demonstrated by multimode interference coupled mode theory (MICMT). The Faraday rotation angle exceeding 85o are observed in a small magnetic flux density B of about 0.5T. Moreover, a high ON/OFF ratio plasma-optic switching is designed, and the ON/OFF ratio (η) of the switch is 19.921dB. Notably, combining the influence of magnetic flux density on transmittance and the modulation of resonance frequency by Fermi energy, optical switching can be implemented at any frequency within the frequency range studied. These results provide methods for active regulation of electromagnetic waves in the terahertz field and have potential applications in optical switching and integrated photonic circuit.

show abstract

“…Its absorption and dispersion characteristics change greatly in the transparent window. For this reason, EIT metamaterial has excellent application prospects in new sensors, 2 – 4 optical modulation, 5 – 7 slow-light devices, 8 – 11 and other fields. The EIT effect has great potential in sensing applications because of its strong dispersion characteristics and high transmission.…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of a compact graphene metamaterial sensor with high sensitivity based on electromagnetically induced transparency

Xiao,

Ma,

Cai

et al. 2023

Opt. Eng.

View full text Add to dashboard Cite

Electromagnetic-induced transparency (EIT) is a transparent window phenomenon with high transmittance in atomic systems, which has a broad application in the sensing field. We propose a compact graphene metamaterial sensor and analyze its mechanism of EIT-like effect. The unit cell is composed of an octagonal star graphene ring and a rectangular graphene ring and excites EIT-like effect through the strong coupling of the light mode and the dark mode. The compact graphene structure design improves the area utilization rate and contributes to the miniaturization of devices, and the EIT window is actively tunable by the change of the Fermi level of graphene to improve the applicable range of the sensor. The numerical simulation demonstrates that the refractive index sensitivity can reach 2.828 THz/RIU, meaning that the transmission curves of the sensor shift 2.828 THz per unit change of refractive index of the surrounding medium and its figure of merit can reach 5.34. The proposed structure can be applied to the high-sensitivity refractive index sensing in the terahertz band and has great application potential in the biological and chemical sensing field.

show abstract

Sensing and slow light applications based on graphene metasurface in terahertz

Cited by 33 publications

References 37 publications

High-sensitive refractive index sensing and excellent slow light based on tunable triple plasmon-induced transparency in monolayer graphene based metamaterial

High-sensitive refractive index sensing and excellent slow light based on tunable triple plasmon-induced transparency in monolayer graphene based metamaterial

Dynamic control of Fano-like interference in the graphene periodic structure

Design and simulation of a compact graphene metamaterial sensor with high sensitivity based on electromagnetically induced transparency

Contact Info

Product

Resources

About