Refractive index-based terahertz sensor using graphene for material characterization

Aruna Veeraselvam, Gulam Nabi Alsath Mohammed, Kirubaveni Savarimuthu, Jaume Anguera, Jessica Constance Paul, Ram Kumar Krishnan

Research output: Indexed journal article Articlepeer-review

17 Citations (Scopus)

Abstract

In this paper, a graphene-based THz metamaterial has been designed and characterized for use in sensing various refractive index profiles. The proposed single-band THz sensor was constructed using a graphene-metal hybridized periodic metamaterial wherein the unit cell had a footprint of 1.395λeff × 1.395λeff and resonated at 4.4754 THz. The realized peak absorption was 98.88% at 4.4754 THz. The sensitivity of the proposed metamaterial sensor was estimated using the absorption characteristics of the unit cell. The performance of the sensor was analyzed under two different categories, viz. the random dielectric loading and chemical analytes, based on the refractive index. The proposed THz sensor offered a peak sensitivity of 22.75 GHz/Refractive Index Unit (RIU) for the various sample loadings. In addition, the effect of the sample thickness on the sensor performance was analyzed and the results were presented. From the results, it can be inferred that the proposed metamaterial THz sensor that was based on a refractive index is suitable for THz sensing applications.

Original languageEnglish
Article number8151
JournalSensors (Switzerland)
Volume21
Issue number23
DOIs
Publication statusPublished - 1 Dec 2021

Keywords

  • Graphene
  • Metamaterials
  • Sensing
  • THz imaging
  • THz sensors

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