Sensitive Detection of Doped Polymer Thin Films Using Terahertz Metamaterial Based on Analog of Electromagnetically Induced Transparency

We propose a novel terahertz metamaterial-based sensor for the sensitive detection of doped polymer thin films. The metamaterial constructed by periodic quasi-ring resonators can generate the analog of electromagnetically induced transparency (EIT) at the terahertz region and work in a wide range of...

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Bibliographic Details
Published in:IEEE sensors journal 2023-02, Vol.23 (4), p.1-1
Main Authors: Hu, Yanqi, Zhou, Xingyu, Sun, Qitai, Zeng, Guang, Xiong, Yongqian
Format: Article
Language:English
Subjects:
Dielectric loss
Dielectrics
doped polymer
Doping
electromagnetically induced transparency
Harmonic oscillators
Magnetic fields
Metamaterials
Polymer films
Polymers
Polymethyl methacrylate
Red shift
Refractive index
Refractivity
Resonance
Resonators
Sensitivity
sensor
Sensors
Terahertz frequencies
terahertz metamaterial
Thickness
Thin films
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Summary:We propose a novel terahertz metamaterial-based sensor for the sensitive detection of doped polymer thin films. The metamaterial constructed by periodic quasi-ring resonators can generate the analog of electromagnetically induced transparency (EIT) at the terahertz region and work in a wide range of incident angles. The simulated results show that the frequency and magnitude of the EIT-like resonance can be respectively affected by the refractive index and dielectric loss of the analyte, which is further explained by coupled harmonic oscillator model. The theoretical sensitivity of the proposed sensor is calculated as 185 GHz/RIU (RIU, Refractive Index Unit), showing a good sensing capability. In experiments, the Dispersed Red 1 (DR1) doped PMMA thin films with a subwavelength thickness of 600 nm were covered on the metamaterial surface. The measured results show that the EIT-like resonance experiences frequency red-shift and magnitude attenuation as the doping concentration increases, indicating the addition of DR1 can lead to the increase of both refractive index and dielectric loss of the PMMA thin film. The proposed metamaterial-based sensor can successfully identify the dielectric change of extremely thin polymer films caused by doping, offering a novel way to achieve high-sensitivity thin-film sensing.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2023.3234970