講演情報
[10p-A22-5]Disposable and flexible paper-based terahertz metasurfaces for multifunctional sensing
〇(M2)PINJUNG LU1, Borwen You2, JaYu Lu1 (1.Nat. Cheng Kung Univ., 2.Nat. Changhua Univ.)
キーワード：
Terahertz spectroscopy、Metasurface、Paper substrate
Conventional terahertz (THz) metasurface fabrication is often costly and complex. To solve this, we present a low-cost (~$0.03/device) method to fabricate disposable paper-based THz metasurfaces using laser toner hot stamping. Patterning a split-ring resonator (SRR) array on paper substrate, the device enables flexible in-situ detection and rapid analyte adsorption. THz-TDS measurements and FEM simulations reveal that near-field waves at the SRRs’ gaps are highly sensitive to optical-path-differences, shifting the LC-resonance frequency for multifunctional sensing. In plastic film sensing, it achieves a thickness sensitivity of 0.465 THz/mm and a LOD of lambda/360. In refractive index (RI) sensing, it successfully identifies four volatile liquids and distinguishes their evaporation rates, reaching a RI sensitivity of 0.114 THz/RIU and an LOD of 0.034. For biosensing applications, it demonstrates steroids sensing with a weight sensitivity of 3.64 GHz/mg and a 0.176 mg-LOD. This disposable paper sensor is promising for subwavelength film detection, environmental monitoring, and point-of-care biochemical diagnostics.