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Highly Sensitive THz Refractive Index Sensor Based on Folded Split-Ring Metamaterial Graphene Resonators

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Abstract

A highly sensitive absorption-based sensor based on folded split-ring metamaterial graphene resonators (FSRMGRs) is designed, and its biomedical application in terahertz (THz) spectrum is investigated. The sensor has a nearly perfect absorption, with a spectral absorption coefficient of 99.75% at 4 THz and an average Q-factor of 13.76. The resonance peak frequency is sensitive to the refractive index (RI) of the test medium (analyte), and a fairly high sensitivity of 851 GHz/RIU has been obtained. The specifications of the sensor can be tuned by an external DC-bias voltage applied to the graphene layer. According to the obtained results, the developed absorber appears to be a good candidate bio-sensing applications.

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Availability of Data and Materials

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Authors and Affiliations

  1. Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran

    Mohammad-Reza Nickpay, Mohammad Danaie & Ali Shahzadi

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  1. Mohammad-Reza Nickpay
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  2. Mohammad Danaie
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  3. Ali Shahzadi
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Contributions

Design, analysis, and investigation: Mohammad-Reza Nickpay, Writing—original draft preparation: Mohammad-Reza Nickpay, Writing—review and editing: Mohammad Danaie, Supervision: Mohammad Danaie and Ali Shahzadi.

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Correspondence to Mohammad Danaie.

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We the undersigned declare that the manuscript entitled “highly sensitive THz refractive index sensor based on folded split-ring metamaterial graphene resonators” is original, has not been fully or partly published before, and is not currently being considered for publication elsewhere. Also, results are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation. We confirm that the manuscript has been read and approved by all named authors and that there are no other persons who satisfied the criteria for authorship but are not listed. We further confirm that the order of authors listed in the manuscript has been approved by all of us.

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Nickpay, MR., Danaie, M. & Shahzadi, A. Highly Sensitive THz Refractive Index Sensor Based on Folded Split-Ring Metamaterial Graphene Resonators. Plasmonics 17, 237–248 (2022). https://doi.org/10.1007/s11468-021-01512-8

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