Fan Shaped THz Frequency Selective Surface for Narrowband Biomolecular Fingerprint Spectroscopy
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A high-Q fan-shaped metasurface bandpass filter operating in the terahertz (THz) regime is presented for narrowbandbiomolecular fingerprint spectroscopy. Full-wave simulations demonstrate a peak transmission coefficient of −0.2 dB at 0.31THz, a −10 dB bandwidth of 25 GHz, and a Q-factor of 12.4. The obtained Q-factor exceeds that of conventional single-layerplanar cross-shaped structures, indicating enhanced spectral selectivity. A reflection coefficient of −24 dB confirms effectiveimpedance matching. Continuous resonance tuning across the 0.28–0.38 THz range is achieved through geometric parametervariation without degradation of spectral characteristics. Simulations were conducted using CST Microwave Studio andvalidated with HFSS. The proposed structure serves as a compact spectral selection component for integration into THz-basedbiomolecular spectroscopy and diagnostic systems.
