Multiband polarization insensitive and tunable terahertz metamaterial perfect absorber based on the heterogeneous structure of graphene

Norouzi-Razani, Amirhossein; Rezaei, Pejman

doi:10.1007/s11082-022-03813-6

Cited by 36 publications

(6 citation statements)

References 67 publications

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“…Fractal element surfaces exhibit enhanced absorbance by increasing their order [27,28]. In the current study of multi-band absorbers of 2D materials, the distribution of peaks was mainly concentrated in the high frequency band of THz [17,20,29,30]. In addition, many absorbers used complex graphic structures, which increased the complexity of manufacturing.…”

Section: Introductionmentioning

confidence: 83%

“…At present, 2D materials are used as metamaterials for absorbers, mainly in the form of monolayers or multilayers, such as monolayer-dielectric-monolayer-dielectric. In absorbers using monolayer 2D materials, most of them have multi-band characteristics [17][18][19]. For example, the nanoribbon structure of graphene was used to achieve three absorption peaks in [20].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Triple-Band Terahertz Metamaterial Absorber Using a Stacked Structure of MoS2 and Graphene

Cai

Kou

2023

Photonics

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A MoS2 and graphene stacked structure is proposed as metamaterials for a triple-band terahertz absorber in this work. The complementary frequency-selective surface of the absorber, consisting of two crossed linear slots and four pairs of concentric circular slots, has three absorptions at 0.6 THz (99.7%), 1.5 THz (95.4%), and 2.5 THz (99.5%). The polarization of the THz absorber is less sensitive to the incident angle within a certain range. By controlling the material properties of MoS2 and graphene, the peak absorption frequency can be tuned within a certain range. The stacked structure of different 2D materials provides new ideas for the design of the THz absorber, which is important for THz in detection, communication, and imaging applications.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

A Novel Triple-Band Terahertz Metamaterial Absorber Using a Stacked Structure of MoS2 and Graphene

Cai

Kou

2023

Photonics

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“…The term 'metamaterial' refers to any material engineered to possess properties not naturally inherent in the material itself [1]. Hence, the focus of numerous researchers in the field of electromagnetics has shifted towards metamaterials [2]. Metamaterials exhibit distinctive properties, including negative refraction [3], the design of solar energy absorbers [4], switches in the terahertz range [5], and coefficient sensors [6].…”

Section: Introductionmentioning

confidence: 99%

Polarization-independent tunable multi-band terahertz absorber based on graphene structure to design the ultra-high sensitive biosensors

Rafighirani,

Javidan,

Heidarzadeh

2024

Phys. Scr.

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In this paper, we investigated the heterogeneous structure of a multi-band perfect absorber based on graphene in the terahertz range, benefiting from polarization independence. The proposed structure comprises three layers: copper, silicon dioxide, and an inhomogeneous graphene structure with an analyte. By altering the dimensions of the sub-layers and the geometric shape of the graphene slices, we can modify the number of bands, quality, and absorption levels. Additionally, adjusting the chemical potential of graphene enables the customization of absorption frequencies as needed. The application of this structure in biological sensors extends to the detection of proteins, viruses, cancer cells, as well as filtering telecommunication waves and imaging. Through geometrically shaping the graphene cuts at frequencies of 4.89 THz, 9.14 THz, and 10.76 THz, absorption values of 99.54%, 99.64%, and 98.3% have been achieved, respectively. Introducing the analyte to the biosensor structure causes a shift in absorption frequency values due to varying refractive index values in different materials. This property has been utilized for biosensor design. Within the refractive index range of biological analytes (e.g., 1.3), the first band achieved a sensitivity value of 2700 GHz/RIU and FoM = 13.08, while the second band achieved a sensitivity value of 2200 GHz/RIU and FoM = 14.02. An important characteristic of this structure is its insensitivity to polarization. Simulations were conducted using Computer Simulation Technology (CST) Microwave Studio Suite 2023.

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“…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). A perfect metamaterial absorber (MPA) is one of the important applications of MTMs.…”

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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Multiband polarization insensitive and tunable terahertz metamaterial perfect absorber based on the heterogeneous structure of graphene

Cited by 36 publications

References 67 publications

A Novel Triple-Band Terahertz Metamaterial Absorber Using a Stacked Structure of MoS2 and Graphene

A Novel Triple-Band Terahertz Metamaterial Absorber Using a Stacked Structure of MoS2 and Graphene

Polarization-independent tunable multi-band terahertz absorber based on graphene structure to design the ultra-high sensitive biosensors

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

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