Quad band metal-dielectric-metal perfect absorber to selective sensing application

Khatami, Seyed Amin; Rezaei, Pejman; Zamzam, Pouria

doi:10.1007/s11082-022-03948-6

Cited by 26 publications

(6 citation statements)

References 49 publications

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“…At this point, the metasurface we designed forms a typical metaldielectric-metal structure [37], and the Fabry-Perot resonance generated between the two metal layers produces absorption [33,38]. Figures 9(c) and (d) show the absorption curves at forward and backward incidence When the conductivity of VO 2 is 2 10 , 6 s = ´respectively.…”

Section: Realizing Narrowband Bidirectional Absorption When Vo 2 Is M...mentioning

confidence: 99%

Switchable bi-functional metasurface for absorption and broadband polarization conversion in terahertz band using vanadium dioxide and photosensitive silicon

Luo,

Qi,

Zhou

et al. 2024

Nanotechnology

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We proposed a bi-functional switchable metasurface based on vanadium dioxide (VO2) and photosensitive silicon. The metasurface functions as a transmissive polarization converter in its insulating state with asymmetric transmission characteristics. It attains a remarkable polarization conversion rate (PCR) surpassing 90% and a notable maximum asymmetric transmission (AT) parameter value of 0.73. This performance is observed within the frequency range from 4.31 THz to 7.86 THz. Dynamic regulation of PCR and AT can be achieved by adjusting the conductivity of photosensitive silicon. To illustrate the underlying factor behind the broadband polarization conversion, the surface current distribution is analyzed at 5.96 THz and 6.08 THz. On the other hand, when VO2 is in the metallic state, the metasurface transforms into a bidirectional absorber with near-perfect absorption in both illumination directions. Under forward incidence of terahertz waves, the absorption rates for the transverse electric (TE) and transverse magnetic (TM) waves are 99.3% at 3.54 THz and 93% at 3.56 THz, respectively. The physical mechanism of near-perfect absorption is explained using impedance matching theory and the electric field distribution. This research expands the applications of transmissive polarization converters within multifunctional metasurfaces, providing new avenues for their practical implementation.

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Section: Realizing Narrowband Bidirectional Absorption When Vo 2 Is M...mentioning

confidence: 99%

Switchable bi-functional metasurface for absorption and broadband polarization conversion in terahertz band using vanadium dioxide and photosensitive silicon

Luo,

Qi,

Zhou

et al. 2024

Nanotechnology

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“…1 c. A single layer of periodic graphene disk arrays, a layer of a dielectric substrate, and a layer of a metallic reflector, typically made of gold, comprise the sensor structure (Biabanifard et al 2020 ; Aidinis et al 2021 ). According to circuit modeling (Khatami et al 2022 ), the conductivity of the gold reflector is estimated to be , making it a short-circuit even in the THz region. It is important to note that the Au reflector is thick enough to prevent terahertz waves from entering.…”

Section: Structure Of the Sensor I And The Equivalent Transmission Li...mentioning

confidence: 99%

Design and analysis of high-sensitivity tunable graphene sensors for cancer detection

Amini

Atlasbaf

2023

Opt Quant Electron

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A new metamaterial refractive index sensor based on the impedance matching idea is suggested to provide an ultra-narrowband absorption response at terahertz frequencies. In order to accomplish this, the graphene layer has been modeled as circuit components using the recently developed transmission line method and the recently proposed circuit model of Periodic Arrays of Graphene Disks. The given research gives a flowchart and equations for designing a sensor, greatly simplifying the sensor design approach. This study only explores Periodic Arrays of Graphene Disks but we think the offered technique is extensible to any available graphene forms that past designers supplied with a circuit model. We compare and contrast the full-wave simulation results with the suggested circuit model. The metallic ground prohibited the transmission of the episode wave, and all occurrence electromagnetic waves are restricted in the basic design between the graphene disk. As a consequence, a perfect narrowband absorption peak is obtained. Disk absorption spectra have been discovered for a variety of refractive lists. The findings of the circuit model and full-wave simulations appear to be balanced. This RI sensor is suitable for biomedical sensing because of the combination of its features. The proposed sensor's performance as a cancer early detection sensor was evaluated among biomedical sensors, and the findings indicated that the proposed sensor is an excellent candidate for this application.

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“…Therefore, the band is limited to four, i.e., quad-band in the current study. There are different quad-band THz absorbers reported in many literatures [14,29,30,[34][35][36][37][38], etc However, many of them [14,34,35,38] do not have sufficient guard-band because of which they are not feasible for parallel processing system applications. This is the one current issue in the literature which has not been addressed.…”

Section: Introductionmentioning

confidence: 99%

Absorption enhancement in silicon-based dielectric resonator for quad-band terahertz biosensing

Gupta,

Maurya

2024

Phys. Scr.

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A technique is implemented to obtain the multi-band perfect absorption (nearly 100%) in an ultrathin silicon-based dielectric resonator (DR) using perturbation. A silicon-based plus-shaped resonator is utilized to design the proposed absorber which provides the four narrow-band absorptions at frequencies of around 5.75, 6.14, 6.48, and 7.24 THz with the level of absorption 54%, 20%, 95%, and 96%, respectively. The plus-shaped resonator is perturbedby cutting slot of plus shape in such a way that it obtains perfect absorption with sufficient guard-band to prevent the multi-band interference in each band. This perturbation provides four absorption peaks at frequencies of around 5.80, 6.27, 6.80, and 7.23 THz, with highly improved absorption in all the bands, i.e., 99.84%, 99.78%, 99.51%, 98.42%, respectively. The ultranarrow absorption peaks with narrow FWHM are suitable for the application of THz biosensing and refractive index analysis. The performance of the proposed absorber is studied with the variation in refractive index of sample. It is found that the proposed absorber provides the high sensitivity 0.186, 0.29, 0.2485, 0.43 THz/RIU and quality factor 280, 185.79, 320.42, and 131.51 for different bands, respectively. The proposed absorber performance is also studied for various THz biosensing applications like the detection of various viruses, malaria, and cancer in the human body at various stages.

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Quad band metal-dielectric-metal perfect absorber to selective sensing application

Cited by 26 publications

References 49 publications

Switchable bi-functional metasurface for absorption and broadband polarization conversion in terahertz band using vanadium dioxide and photosensitive silicon

Switchable bi-functional metasurface for absorption and broadband polarization conversion in terahertz band using vanadium dioxide and photosensitive silicon

Design and analysis of high-sensitivity tunable graphene sensors for cancer detection

Absorption enhancement in silicon-based dielectric resonator for quad-band terahertz biosensing

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