Spoof surface plasmon-based terahertz metasensor for glucose and ethanol

We report a spoof surface plasmon-based THz metamaterial sensor that shows very sharp resonances. The novel THz metasensor incorporates square split ring resonator (SSRR) and + type grooved resonator in the transmission geometry. Due to corrugation on the metasurface, spoof surface plasmons are exci...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2022-09, Vol.128 (9), Article 840
Main Authors: Bhati, Ruchi, Jewariya, Mukesh, Malik, Anil K
Format: Article
Language:English
Subjects:
Applied physics
Biosensors
Blue shift
Characterization and Evaluation of Materials
Condensed Matter Physics
Current distribution
Ethanol
Glucose
Machines
Manufacturing
Materials science
Metamaterials
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Plasmons
Processes
Resonance
Resonators
Sensitivity
Surfaces and Interfaces
Terahertz frequencies
Thin Films
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Summary:We report a spoof surface plasmon-based THz metamaterial sensor that shows very sharp resonances. The novel THz metasensor incorporates square split ring resonator (SSRR) and + type grooved resonator in the transmission geometry. Due to corrugation on the metasurface, spoof surface plasmons are excited at terahertz frequency. Two resonances at frequencies 0.59 THz (mode A) and 1.7 THz (mode B) are obtained in the transmission spectra. Strong field confinement and surface current distribution are obtained for both resonance modes. Blue shift in both the resonance frequencies is observed with the increase in the capacitive gap of the resonator. We investigate our metasurface for ethanol and glucose sensing. A significant high sensitivity is observed for both resonant modes. The comparison of our results with other experimental results (Hu et al. in Laser Photonics Rev 10(6):962–969, 2016) shows similar trend for both glucose and ethanol. Moreover, sensitivity obtained for resonant mode B in our case is two times higher than above experimental report. The proposed device is a compact planner and easy to realize, which can be used as highly efficient THz biosensors. The functionality of our sensor can be extended to other frequency regimes by scaling its dimensions.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-022-05943-w