Table 1 Fingerprint detection of metasurface
Scheme | Multiplex | AIT (Enhancement factor) | Frequency range | Analyte | Enhancement factor | Comment |
|---|---|---|---|---|---|---|
Dielectric metagrating [40] | Angle | / | Mid-IR | Isomer (hBN, cBN) | 5.4 (Theory) | |
Dielectric metagrating [30] | Angle/thickness | / | THz (0.9–1.6 THz) | Isomer (ε-HNIW, γ-HNIW) | 79 (Theory) | Fluid and substrate hardly have same RI, making this composite multiplex unrealistic |
Plasmonic metasurface [41] | Graphenevoltage/geometry | / | THz (1.2–2.7 THz) | glucose | 5 (Theory) | |
FSFS(This work) | Geometry | α-lactose (7) | THz (0.95–2 THz) | Chiral enantiomers (D-carnitine and L-carnitine) | 7.3 (Experiment) |