An Ultra-Wideband Terahertz Metamaterial Absorber Utilizing Sinusoidal-Patterned Dielectric Loaded Graphene

Nourbakhsh, Milad; Zareian‐Jahromi, Ehsan; Basiri, Raheleh; Mashayekhi, Valiollah

doi:10.1007/s11468-020-01203-w

Cited by 16 publications

(7 citation statements)

References 50 publications

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“…The thickness of the proposed absorber remains comparable to the absorbers reported in the literature. Attaining the absorption more than 90% in the frequency range from 0.1 to 1 THz remains challenging which was earlier possible with the geometries of quite large thickness [22,30,52,70,71]. The proposed absorber offers the significant broad absorption spectrum with its ultrathin geometry which remains hard to achieve in developing the electromagnetic shield and packaging.…”

Section: Sementioning

confidence: 99%

“…Moreover, the packaging of the different electronic components requires an efficient shield and foil which can avoid the EM interference with the other electronic equipment [20,21]. The development of the broadband absorbers can be possible with the utilization of some methods; (i) by using the multi-layered structure in which each layer operates with the multiple resonances to provide the broad resonance spectrum [9,[22][23][24][25], (ii) by engraving the multiple resonating edges in the resonator so that a number of resonances with merged adjacent spectrum can be generated in the absorber structure and a broad absorption band can be obtained [21,26] and (iii) by utilizing the resonator of dimensions so that a large aspect ratio of the resonator can be set and multiple resonance can be achieved with the merged spectrum [16]. These ways of implementing the broadband absorbers are not suitable to develop the ultrathin geometry which are highly required in the above quoted application areas [9,16,27].…”

Section: Introductionmentioning

confidence: 99%

“…These ways of implementing the broadband absorbers are not suitable to develop the ultrathin geometry which are highly required in the above quoted application areas [9,16,27]. Developing the ultrathin geometry can be possible with the utilization of recent physical phenomena of trapping the localized surface plasmons in a small area and by confining the incident EM power within the thin layer of the dielectric material behaving as the Fabry-Perot cavity [22,25,[28][29][30][31][32]. This purpose can be served with the utilization of recently discovered graphene material [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultra-thin metal-free terahertz absorber for electromagnetic shielding

Mandal,

Varshney,

Jagadeesh

2023

Phys. Scr.

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Abstract-An ultrathin broadband absorber covering the frequency range of 0.1 to 10 terahertz is designed and numerically analysed. The absorber structure utilizes a partial reflecting surface and reflector of graphene separated by a thin dielectric spacer providing the metal-free structure. Multiple resonances are generated in the absorber structure whose spectrum can be separated or merged to find the narrow or broad absorption spectrum. The proposed absorber operates with the combine effect of the electromagnetic (EM) resonances occurring in the graphene resonator and the destructive interference taking place in the dielectric spacer. The absorber operation is validated through the theory of electromagnetic coupled mode resonances and with the theory of multiple reflections. The narrow absorption peaks can allow the proposed absorber to be utilized as refractive index sensor and the broad absorption spectrum can allow it to be utilized in the EM shielding and packaging applications.

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Section: Sementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultra-thin metal-free terahertz absorber for electromagnetic shielding

Mandal,

Varshney,

Jagadeesh

2023

Phys. Scr.

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“…Moreover, white-light cavities have also been utilized to attain a narrow to wide absorption bandwidth over optical ranges [11][12][13]. The advanced applications always follow the concept of scaling of the systems, which requires developing the thin or ultrathin devices and structures [14,15]. The phenomenon of CPA occurring in thin film can help to fulfill this requirement.…”

Section: Introductionmentioning

confidence: 99%

CPA-induced Hz to THz broadband absorber with switchable perfect absorption between radio-microwave and THz frequency spectrum

Khan,

Giri,

Varshney

et al. 2024

Nanotechnology

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The coherent perfect absorption (CPA) occurring in the graphene sheet suspended in the air can be utilized to develop an ultrathin, ultra-broadband absorber working in the frequency range covering from the few hertz (Hz) to terahertz (THz) with perfect absorption. A graphene sheet is studied for inducing the CPA covering the radio, microwave and lower THz frequency ranges. A graphene resonator able to provide the surface plasmon resonance is combined with the graphene sheet providing CPA at either side of a thin dielectric layer forms metamaterial structure with the cavity and enhances the absorption bandwidth in the THz region by creating a resonance near to the quasi-CPA frequency. A dielectric resonator of silicon working is engraved in the structure which creates the dipolar resonances between the resonances obtained by the formed cavity between the graphene sheet and resonator. This enhances the absorption level in the THz region. The absorption bandwidth is further enhanced to 7 THz by including a graphene disc at the top of silicon resonator. Thus, the multiple multi-order resonances occurring in the silicon dielectric and surface plasmon resonance of graphene resonators are merged with the phenomena of CPA occurring in the graphene sheets to extend the CPA bandwidth in THz regime. The doping level of graphene or its tunable Fermi energy based on the applied DC electric field can provide the tunability in the total obtained absorption bandwidth. The symmetric structure can provide the polarization insensitive behavior with the allowed incident angle of more than 45° with more than 90% absorption.

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“…THz devices have many applications in communication, imaging and spectroscopy. Of all the devices, broadband terahertz absorbers have been the most researched due to their attractive applications in detection systems [21].…”

Section: Iintroductionmentioning

confidence: 99%

Tunable broad-band absorber consisted of crossed-oval shape of graphene

Bagheri¹,

Hosseini²,

Bahadoran³

2022

Phys. Scr.

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A three-dimensional broadband absorber structure was proposed based on the crossed-oval shape of graphene(COSG) on a wafer layout. This structure consisted of silicon/gold/silica wafer and a superstrate layer of graphene patterns in the form of crossed-ovals placed on top of the wafer. The effect of geometrical parameters on the absorption was studied. Results show that this structure can absorb over 99 % of the incoming light over a broad range of THz frequencies. The absorption peaks were fine-tuned by changing the geometrical and physical parameters. This property is vital and desirable in optical detectors, chemical sensors, and other optical devices.

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An Ultra-Wideband Terahertz Metamaterial Absorber Utilizing Sinusoidal-Patterned Dielectric Loaded Graphene

Cited by 16 publications

References 50 publications

Ultra-thin metal-free terahertz absorber for electromagnetic shielding

Ultra-thin metal-free terahertz absorber for electromagnetic shielding

CPA-induced Hz to THz broadband absorber with switchable perfect absorption between radio-microwave and THz frequency spectrum

Tunable broad-band absorber consisted of crossed-oval shape of graphene

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