Dual-band/ultra-broadband switchable terahertz metamaterial absorber based on vanadium dioxide and graphene

Song, Chengwei; Wang, Jiayun; Zhang, Binzhen; Qu, Zeng; Jing, Huihui; Kang, Jingfeng; Hao, Jingxian; Duan, Junping

doi:10.1016/j.optcom.2022.129027

Cited by 30 publications

(8 citation statements)

References 24 publications

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“…In fact, broadband terahertz absorbers based on VO 2 and graphene have been widely used. Broadband-narrowband absorption switching, 44 broadband-multiband absorption switching [45][46][47] and dual-broadband switching 30,31 have been realized. However, there are few devices that implement dual broadband absorption switching in previous research.…”

Section: Resultsmentioning

confidence: 99%

A dual ultra-broadband switchable high-performance terahertz absorber based on hybrid graphene and vanadium dioxide

Chen

Wang

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 99%

A dual ultra-broadband switchable high-performance terahertz absorber based on hybrid graphene and vanadium dioxide

Chen

Wang

et al. 2023

Phys. Chem. Chem. Phys.

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“…The local electronic field enhancement gives rise to the terahertz metasurfaces makes the detection of target biochemical molecules more sensitive. With the in-depth study of terahertz waves and the development of material science, metamaterial interfaces based on graphene have great potential for applying in the fields of terahertz biosensor design, molecular analysis was done and medical imaging [ 55 , 56 ]. By using the periodic structure of the two-dimensional material graphene arranged as a unitary structure to interact with the incident electromagnetic waves, a resonant mode of structural neutron excitation on the surface is induced, which is made more sensitive to changes in the surrounding environment by the enhancement of the local electric field in the near field.…”

Section: Fundamental Theoretical Aspects In the Terahertz Metasurface...mentioning

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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“…Graphene is unique in that its Fermi level can be altered by the application of an external electric field 24 . To understand the phase flip associated with the Brewster angle, an arbitrary initial Fermi level is selected such that E1f=E2f=0 eV.…”

Section: Principles Of Optical Switches Based On the Brewster Angle E...mentioning

confidence: 99%

Optical switch of low-insertion-loss based on the Brewster angle effect

Xiong

Zhu

2023

Opt. Eng.

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.Optical switches are critical components for optical communication devices, and currently, they are now bottlenecking the development of optical telecommunications. In this study, we propose an innovative all-optical Kerr switch based on the Brewster angle effect, which exhibits a graphene/SiO2/graphene/SiO2 structure and an insertion loss (IL) that can be minimized by tuning the Fermi level of the graphene layers. A novel Brewster’s angle effect is achieved, resulting in a change in the incidence angle under nonlinear conditions as well as on–off switching of the phase change. The proposed switch has perfect absorption at an incident angle of 63 deg, where the phase of the reflected light is shifted from − π to 0. Furthermore, the Brewster angle of the switch was successfully shifted from 63 deg to 80 deg with an incident frequency of 0.8 THz. It was observed that an increase in Fermi level continuously shrank the nonlinear region of the switch. The minimum IL of the proposed optical switch was only 2 dB, which is indicative of excellent energy efficiency. The results of this study can aid in the development of key devices for broadband communications and electromagnetic sensing.

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Dual-band/ultra-broadband switchable terahertz metamaterial absorber based on vanadium dioxide and graphene

Cited by 30 publications

References 24 publications

A dual ultra-broadband switchable high-performance terahertz absorber based on hybrid graphene and vanadium dioxide

A dual ultra-broadband switchable high-performance terahertz absorber based on hybrid graphene and vanadium dioxide

Advances in terahertz metasurface graphene for biosensing and application

Optical switch of low-insertion-loss based on the Brewster angle effect

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