Tunable multiple band THz perfect absorber with InSb metamaterial for enhanced sensing application

Zhan, Ying; Yin, Huaiyuan; Wang, Jiahao; Yao, Huawei; Fan, Chunzhen

doi:10.1016/j.rio.2022.100255

Cited by 16 publications

(4 citation statements)

References 51 publications

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“…The proposed device has a simple structural design, less thickness, compact size, and narrow linewidth properties, suggesting sensing and detection applications. Table 1 compares the performance of nine relevant works with our work which clearly shows that the FOM and Q in our design outperform the previous work in Ref [31][32][33][35][36][37][38][39][40][41][42] . The fourth peak of absorption response has FOM of 44, full width at half maximum (FWHM) value of 0.05 THz, peak sensitivity of 2.2 THz/RIU, and Q-factor value of 117.…”

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confidence: 78%

Machine learning assisted hepta band THz metamaterial absorber for biomedical applications

Jain

Chhabra

Chauhan

et al. 2023

Sci Rep

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A hepta-band terahertz metamaterial absorber (MMA) with modified dual T-shaped resonators deposited on polyimide is presented for sensing applications. The proposed polarization sensitive MMA is ultra-thin (0.061 λ) and compact (0.21 λ) at its lowest operational frequency, with multiple absorption peaks at 1.89, 4.15, 5.32, 5.84, 7.04, 8.02, and 8.13 THz. The impedance matching theory and electric field distribution are investigated to understand the physical mechanism of hepta-band absorption. The sensing functionality is evaluated using a surrounding medium with a refractive index between 1 and 1.1, resulting in good Quality factor (Q) value of 117. The proposed sensor has the highest sensitivity of 4.72 THz/RIU for glucose detection. Extreme randomized tree (ERT) model is utilized to predict absorptivities for intermediate frequencies with unit cell dimensions, substrate thickness, angle variation, and refractive index values to reduce simulation time. The effectiveness of the ERT model in predicting absorption values is evaluated using the Adjusted R2 score, which is close to 1.0 for nmin = 2, demonstrating the prediction efficiency in various test cases. The experimental results show that 60% of simulation time and resources can be saved by simulating absorber design using the ERT model. The proposed MMA sensor with an ERT model has potential applications in biomedical fields such as bacterial infections, malaria, and other diseases.

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confidence: 78%

Machine learning assisted hepta band THz metamaterial absorber for biomedical applications

Jain

Chhabra

Chauhan

et al. 2023

Sci Rep

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“…It is worth noting that the gold conductivity is nearly constant in the THz range from 0.1 THz to 4.20 THz as reported by Squires et al [35], Choi et al [36], and Takano et al [37]. Therefore, the gold conductivity is taken as a constant value of 4.09×10 7 S/m in the frequency range 3.85 THz -4.1 THz as reported in [8], [9], [38], [39], [40], [41].The bottom layer has a thickness of t = 200 nm which is larger than the gold skin depth in the THz spectrum. Therefore, zero transmission will be obtained through the ground plane [9].…”

Section: Parametersmentioning

confidence: 89%

“…The reported sensor has a high sensitivity of 2000 GHz/RIU, a high-quality factor of 35.70, FOM of 17.93 RIU -1 using the initial geometrical parameters. According to the impedance matching theory, the impedance of the perfect absorption design should be matched with the free space impedance as much as possible in order to reduce the reflection from the surface of the proposed design [39]. The relative impedance of the proposed sensor is given by [49]:…”

Section: Sensitivity Analysis For Cancer Early Detectionmentioning

confidence: 99%

Highly Sensitive Triple-Band THz Metamaterial Biosensor for Cancer Cell Detection

Elhelw,

Ibrahim,

Rashed

et al. 2023

IEEE Photonics J.

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Abstract-Highly sensitive triple-band metamaterial-based biosensor for different cancer cells detection is suggested and numerically analyzed. The reported sensor has a polyimide dielectric layer which is sandwiched between gold bottom plane and top metallic patches. The analyte sample covers the metallic patch where multiple resonances occur with high absorption. The resonance frequencies depend on the optical properties of the analyte sample. Therefore, the proposed sensor can distinguish between different cancer cell types such as skin cancer, blood cancer, and Breast cancer. Full vectorial finite element method is used to study the effects of the geometrical parameters with the aim to maximize the sensor sensitivity. The suggested sensor has high sensitivity of 2050 GHz/RIU (which is much higher than those suggested in the literature) with high quality factor of 55.34 in the frequency range from 4.25 THz to 4.75 THz. Further, the proposed biosensor is a label-free, and easy for fabrication using the state-of-the-art fabrication technologies.

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“…MMAs have emerged as a prominent research area, typically comprising of tri/multi-layer metal-dielectric (MD) structures that include a conductive resonator structure, dielectric spacer, and metal ground plane [6][7][8][9][10][11]. In recent years, a significant amount of research has been dedicated to the development and intensive investigation of THz MMAs [12][13][14][15][16][17][18][19][20][21][22][23]. By adjusting the shape, size, and electromagnetic (EM) parameters of the unit-cell structure of MMAs on a sub-wavelength scale, it is possible to achieve desirable and excellent single-band, dual-band, tri-band, multi-band, broadband, and even ultra-broadband perfect absorption [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Dual-narrowband terahertz metamaterial absorber based on all-metal vertical ring array for enhanced sensing application

Cai,

Yang,

et al. 2024

Phys. Scr.

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In this paper, a novel design of a dual-narrowband metamaterial absorber (MMA) was proposed for use as a high-performance refractive index (RI) sensor in the terahertz (THz) region. The proposed MMA is based on a vertical-ring-shaped (VRS) structure gold film array. Through numerical simulation, it was found that the MMA can achieve high absorption levels of 99.8% and 94.6% at 1.723 THz and 2.457 THz, respectively, which are consistent with the values obtained using coupling mode theory (CMT). The MMA also exhibits high Q-factor values of about 27.35 and 102.38, respectively, which are close to the CMT values of 29.94 and 98.34. The dual-band strong absorption of the MMA is attributed to the guided modes of the critical coupling resonance, and the absorption properties can be adjusted by changing the geometrical parameters of the unit-cell structure of the MMA. The proposed MMA has a narrowband and a higher Q-factor, making it suitable for RI sensing, with a sensitivity of about 1.66 and 1.88 THz/RIU, and a figure-of-merit (FOM) of about 259.4 and 659.7 RIU−1, respectively. These findings open up new opportunities for the development of highly efficient MMAs, which have potential applications in biochemical sensing and detection in the THz region.

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Tunable multiple band THz perfect absorber with InSb metamaterial for enhanced sensing application

Cited by 16 publications

References 51 publications

Machine learning assisted hepta band THz metamaterial absorber for biomedical applications

Machine learning assisted hepta band THz metamaterial absorber for biomedical applications

Highly Sensitive Triple-Band THz Metamaterial Biosensor for Cancer Cell Detection

Dual-narrowband terahertz metamaterial absorber based on all-metal vertical ring array for enhanced sensing application

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