Broadband polarization insensitive and tunable terahertz metamaterial perfect absorber based on the graphene disk and square ribbon

Norouzi-Razani, Amirhossein; Rezaei, Pejman

doi:10.1016/j.spmi.2022.107153

Cited by 42 publications

(9 citation statements)

References 55 publications

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“…As mentioned, graphene is a two-dimensional metamaterial, so an effective surface conductivity is adopted. The surface conductivity of graphene σ(ω,τ,μc,T) can be calculated by Kubo formulas, considering intraband and interband transitions 36 σ(ω,τ,μc,T)=σinter(ω,τ,μc,T)+σintra(ω,τ,μc,T),σinter(ω,τ,μc,T)=−je24πh ln(2μc+(ω−jτ−1)h2μc−(ω−jτ−1)h),σintra(ω,τ,μc,T)=…”

Section: Structure and Designmentioning

confidence: 99%

Broadband terahertz absorber based on the coupling between Au and graphene

Cai

Sun

2023

Opt. Eng.

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A simply designed broadband meta-absorber (MA) that works in terahertz (THz) band is proposed and investigated. The reflector substrate of the MA is composed of nickel. The middle layer of this structure is made of dielectric Al 2 O 3 , which serves as a dielectric layer between the nickel and the metasurface layer. The metasurface layer comprises a graphene ring with a disk-like Au in the center. The wideband absorption mechanism benefits from the hybridized surface plasmonic modes caused by the coupling between the Au disk and the graphene ring. Besides, with the adhesion of the top Au metal disk, Fabry-Perot cavities formed by the top Au and the bottom metal produce the continuous cavity resonant modes also to enhance surface hybridization plasmons. Because the proposed broadband MA is symmetrical, it is insensitive to polarization and has a good bearing angle of 0 deg to 70 deg. The results of our study may inspire specific applications of wave modulation, including THz imaging, detecting, modulation, and sensing.

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Section: Structure and Designmentioning

confidence: 99%

Broadband terahertz absorber based on the coupling between Au and graphene

Cai

Sun

2023

Opt. Eng.

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“…Although a lot of work has been done on graphene-based MMAs, they still suffer from drawbacks such as large footprint, complex structure, angle dependency, decreased absorptivity, and polarization sensitivity. In [57] authors propose a graphene disk and square ribbon-based absorber. The absorber operates in the 1.482-3.655 THz range with an absorption level of 90%.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Insensitive, Broadband, and Tunable Terahertz Absorber Using Slotted-Square Graphene Meta-Rings

et al. 2023

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“…These can present some unique and different properties from normal materials such as inverse Doppler effects, zero index of refraction, negative refractions, and so on (Moitra et al, 2013;Shelby, Smith, & Schultz, 2001). In recent decades a lot of research has been done for different frequency ranges such as GHz (Cao et al, 2019;Karaaslan et al, 2018), optical (Kumar, Singh, Tiwari, & Pandey, 2022;Mulla & Sabah, 2016) and terahertz(Norouzi- Razani & Rezaei, 2022a;Razani, Rezaei, Zamzam, Khatami, & Daraei, 2022). Engineered designs by using metamaterials in the terahertz region have fascinated much consideration due to their potential application in imaging, sensing and absorption(Norouzi- Razani & Rezaei, 2022b;Shen et al, 2022;Zamzam, Rezaei, & Khatami, 2021).…”

Section: Introduction 1-1 Metamaterials Perfect Absorbermentioning

confidence: 99%

Triple-band metamaterial perfect absorber for refractive index sensing in THz frequency

Khodadadi

Babaeinik

Ghods

et al. 2023

Preprint

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A triple-band metamaterial perfect absorber (MPA) is founded of monolayer graphene in THz region which is adjustable and polarization-independent is presented. The first layer of the structure from top contains of a graphene ring at the center of structure with four graphene wheel-shaped around it and four graphene triangles in the corner. This proposed structure has caused us to achieve 98.64%, 99.97% and 99.98% perfect absorptions peaks at 8.17 THz, 9.74 THz and 11.95 THz, respectively. We can vary the absorption peak frequencies to our desirable frequencies by changing the Fermi level of graphene. By tunining the incident angle waves up to 60 degrees, the frequency peaks and the value of absorption change slightly. Moreover, very significant matter about suggested absorber structure design is that it is polarization independent so by tuning the polarization angle, the frequency peaks and the value of absorption remain unchanged. These aspects make the suggested absorber proper for applications such as imaging, detecting, filtering and sensing. We have investigated the application of the MPA in the sensing of refractive index. The refractive index of the unknown material can be measured through shifts of frequency peaks. Based on the obtained results, it seems that the metamaterial perfect absorber is a good candidate for biosensors application.

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Broadband polarization insensitive and tunable terahertz metamaterial perfect absorber based on the graphene disk and square ribbon

Cited by 42 publications

References 55 publications

Broadband terahertz absorber based on the coupling between Au and graphene

Broadband terahertz absorber based on the coupling between Au and graphene

Polarization-Insensitive, Broadband, and Tunable Terahertz Absorber Using Slotted-Square Graphene Meta-Rings

Triple-band metamaterial perfect absorber for refractive index sensing in THz frequency

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