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Excitation of high Q-factor Fano resonance in asymmetric THz metamaterial for microplastics sensing applications
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Researchers designed a terahertz (THz) metasurface sensor — a structured material that interacts with light at microwave-like frequencies — achieving high sensitivity by exploiting a phenomenon called Fano resonance, which produces a very sharp detection signal. The sensor's high quality factor and stability across viewing angles make it well-suited for detecting and identifying microplastic particles by their unique optical signatures.
• A novel THz meta surface structure consisting of square and circular unit cells made from a polyimide substrate has been developed, achieving a Fano resonant frequency of 0.72 THz. • This structure exhibits high quality factors (Q factors) of 26.5 and 720, demonstrating strong energy concentration and a narrowband response. • Its enhanced sensing capabilities make the structure suitable for detecting microplastics, with an improved figure of merit (FOM) compared to earlier models. • Moreover, the sensor maintains its performance across incident and polarization angles of up to 60°, making it highly effective for microplastic sensing applications. The increasing demand for terahertz (THz) technology in various applications has resulted in the need for high-quality, highly sensitive THz sensors. This work analyses the refractive index sensing properties of a Fano resonance THz metasurface. The metasurface structure uses square-circle resonators on a Polyimide substrate. The proposed structure has an improved quality factor(Q-factor) and better properties for sensing applications. The unit cell has an asymmetric structure that achieves the resonance at 0.69 THz and exhibits a Fano resonance at 0.72 THz with a Q-factor of 26.5 and 720 respectively. The Figure of Merit (FOM) at Fano resonance is higher than that of fundamental resonance. The proposed structure exhibits angle-independent characteristics up to 60°. The high-Q factor enhances the sensing capability of the metasurfaces, which is further analyzed for microplastic sensing applications.
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