Fig. 4From: Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvementa The measured transmission of the designed MMs-based biosensors under different cell concentrations, 1 × 105cell/ml, 2 × 105cell/ml and 3 × 105cell/ml, respectively. b The dependence of resonant frequency shift Δf on cell concentration extracted from (a) [36]Back to article page