Ultrasensitive THz Refractive Index Sensor Based on a Controllable Perfect MTM Absorber

Nejat, Mohamad; Nozhat, Najmeh

doi:10.1109/jsen.2019.2931057

Cited by 104 publications

(67 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7, it is obvious that increasing the dimensions of the resonators causes a redshift in the resonance wavelength. Since h is orthogonal to the electric field of the incident lightwave and the LSPs are almost excited in this interface of metallic cubic resonators and test medium 14 , changing the value of h has more effect on the absorption spectrum compared to the variation of w. The dimensions of cubic resonators have been chosen 200×200 nm 2 to create good absorption with proper resonance wavelength.…”

Section: Design and Simulation Results Of Four-band Perfect Absorber mentioning

confidence: 99%

“…The equivalent circuit model is the first method that is utilized to verify the simulation results. The dielectric substrate is modeled by the transmission line 1 (TL-1) with the characteristic impedance of , where η 0 , ε r , and λ g are the free space impedance, the relative permittivity of the dielectric layer, and the guided wavelength, respectively 14 . Also, the test medium, modeled by the transmission line 2 (TL-2), has the same parameters of the TL-1, in which ε r should be replaced by ε = n a a nalyte 2 .…”

Section: Methodsmentioning

confidence: 99%

“…Over recent years, many SP-based structures have been studied and investigated such as perfect absorbers 10 , waveguides 11 , modulators 12 , lasers 13 , and sensors 14 . The unique properties of the SPRs such as strong dependency on the size, geometrical shape and refractive index of the surrounding medium make them good candidates for sensing applications 15 .…”

Section: Multi-band Mim Refractive Index Biosensor Based On Ag-air Grmentioning

confidence: 99%

“…It is well known that the sensing performance of SPR-based sensors is due to the wavelength shift λ ∆ ( ) of the response spectrum, when the refractive index of the test medium ∆n ( ) changes. The sensitivity λ = ∆ ∆n (S / ), full-width at half-maximum (FWHM) and figure of merit (FOM = S/FWHM) are the main parameters for evaluating the sensing performance 14,16 . SPR-based sensors have attracted much attention because of good advantages like miniaturization, rapid response and high sensitivity 17 .…”

Section: Multi-band Mim Refractive Index Biosensor Based On Ag-air Grmentioning

confidence: 99%

See 3 more Smart Citations

Multi-band MIM refractive index biosensor based on Ag-air grating with equivalent circuit and T-matrix methods in near-infrared region

Nejat

Nozhat

2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

In this paper, a multi-band metal-insulator-metal (MIM) perfect absorber with refractive index sensing capability has been investigated in near-infrared region. The proposed structure has been studied for biomedical applications such as detection of solution of glucose in water, diagnosis of different stages of malaria infection, bacillus bacteria and cancer cells. The MIM configuration improves the sensing parameters of the biosensor due to the good interaction with the analyte. The high sensitivity and figure of merit of 2000 nm/RIU and 100 RIU−1 have been achieved, respectively. Also, the Ag-air grating in the suggested plasmonic sensor helps the localized surface plasmons excitation and makes the structure sensitive to the incident lightwave polarization. Therefore, the presented biosensor behaves like a polarization switch with the high extinction ratio and fast response time of 25.15 dB and 100 fs, respectively. The methods of equivalent circuit model and transmission matrix have been utilized to verify the simulation results, as a new challenge in near-infrared region. The new idea of multi-application plasmonic devices, the feasibility of fabrication for the presented structure and utilizing mentioned analytical methods in near-infrared region could pave the way for the future of plasmonic structures.

show abstract

Section: Design and Simulation Results Of Four-band Perfect Absorber mentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Multi-band Mim Refractive Index Biosensor Based On Ag-air Grmentioning

confidence: 99%

Section: Multi-band Mim Refractive Index Biosensor Based On Ag-air Grmentioning

confidence: 99%

See 2 more Smart Citations

Multi-band MIM refractive index biosensor based on Ag-air grating with equivalent circuit and T-matrix methods in near-infrared region

Nejat

Nozhat

2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, there is increasing interesting in studying the perfect absorption of electromagnetic waves for refractive-index sensing by employing metasurfaces , metallic nanostructures , and graphene nanostructures [62][63][64][65][66][67][68][69][70][71], in violet [62], visible [1][2][3][4][5][33][34][35][36][37][38][39][40][41][42][43]63,64], infrared [6][7][8][9][10][11][12][13][14][15][16][17][44][45][46][47][48][49][50][51][52]…”

Section: Introductionmentioning

confidence: 99%

Perfect Absorption and Refractive-Index Sensing by Metasurfaces Composed of Cross-Shaped Hole Arrays in Metal Substrate

Yan

Tang

et al. 2020

Nanomaterials

View full text Add to dashboard Cite

Achieving perfect electromagnetic wave absorption with a sub-nanometer bandwidth is challenging, which, however, is desired for high-performance refractive-index sensing. In this work, we theoretically study metasurfaces for sensing applications based on an ultra-narrow band perfect absorption in the infrared region, whose full width at half maximum (FWHM) is only 1.74 nm. The studied metasurfaces are composed of a periodic array of cross-shaped holes in a silver substrate. The ultra-narrow band perfect absorption is related to a hybrid mode, whose physical mechanism is revealed by using a coupling model of two oscillators. The hybrid mode results from the strong coupling between the magnetic resonances in individual cross-shaped holes and the surface plasmon polaritons on the top surface of the silver substrate. Two conventional parameters, sensitivity (S) and figure of merit (FOM), are used to estimate the sensing performance, which are 1317 nm/RIU and 756, respectively. Such high-performance parameters suggest great potential for the application of label-free biosensing.

show abstract

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Wang

Duan

et al. 2023

Adv Funct Materials

117

View full text Add to dashboard Cite

Metamaterial absorbers have been widely studied and continuously concerned owing to their excellent resonance features of ultra-thin thickness, light-weight, and high absorbance. Their applications, however, are typically restricted by the intrinsic dispersion of materials and strong resonant features of patterned arrays (mainly referring to narrow absorption bandwidth). It is, therefore essential to reassert the principles of building broadband metamaterial absorbers (BMAs). Herein, the research progress of BMAs from principles, design strategies, tunable properties to functional applications are comprehensively and deeply summarized. Physical principles behind broadband absorption are briefly discussed, typical design strategies in realizing broadband absorption are further emphasized, such as top-down lithography, bottom-up self-assembly, and emerging 3D printing technology. Diversified active components choices, including optical response, temperature response, electrical response, magnetic response, mechanical response, and multi-parameter responses, are reviewed in achieving dynamically tuned broadband absorption. Following this, the achievements of various interdisciplinary applications for BMAs in energy-harvesting, photodetectors, radar-IR dual stealth, bolometers, noise absorbing, imaging, and fabric wearable are summarized. Finally, the challenges and perspectives for future development of BMAs are discussed.

show abstract

Ultrasensitive THz Refractive Index Sensor Based on a Controllable Perfect MTM Absorber

Cited by 104 publications

References 42 publications

Multi-band MIM refractive index biosensor based on Ag-air grating with equivalent circuit and T-matrix methods in near-infrared region

Multi-band MIM refractive index biosensor based on Ag-air grating with equivalent circuit and T-matrix methods in near-infrared region

Perfect Absorption and Refractive-Index Sensing by Metasurfaces Composed of Cross-Shaped Hole Arrays in Metal Substrate

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Contact Info

Product

Resources

About