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Related Experiment Video

Updated: Oct 10, 2025

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Refractive Index-Based Terahertz Sensor Using Graphene for Material Characterization.

Aruna Veeraselvam1, Gulam Nabi Alsath Mohammed1, Kirubaveni Savarimuthu1

  • 1Department of ECE, Sri Sivasubramaniya Nadar College of Engineering, Chennai 603110, India.

Sensors (Basel, Switzerland)
|December 10, 2021
PubMed
Summary
This summary is machine-generated.

This study presents a novel graphene-based terahertz (THz) metamaterial sensor. It demonstrates high sensitivity for detecting refractive index changes in various materials, showing promise for advanced sensing applications.

Keywords:
THz imagingTHz sensorsgraphenemetamaterialssensing

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Metamaterials offer unique electromagnetic properties.
  • Terahertz (THz) technology is emerging for sensing applications.
  • Graphene-based devices provide tunable characteristics.

Purpose of the Study:

  • To design and characterize a graphene-based metamaterial for THz sensing.
  • To evaluate the sensor's performance for detecting refractive index variations.
  • To assess the impact of sample loading and thickness on sensor sensitivity.

Main Methods:

  • Design of a single-band THz metamaterial sensor with a graphene-metal hybridized unit cell.
  • Resonance frequency analysis at 4.4754 THz with 98.88% peak absorption.
  • Sensitivity estimation based on absorption characteristics under dielectric loading and chemical analytes.

Main Results:

  • Achieved a peak sensitivity of 22.75 GHz/Refractive Index Unit (RIU).
  • Demonstrated effective sensing for random dielectric loading and chemical analytes.
  • Analyzed and presented the influence of sample thickness on sensor performance.

Conclusions:

  • The proposed graphene-based metamaterial THz sensor exhibits high sensitivity and suitability for refractive index sensing.
  • The sensor design shows potential for diverse THz sensing applications.
  • Further analysis confirms the viability of the metamaterial for detecting various sample properties.