Fig. 5From: Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvementSpectra of the 4-MeI detection, using the THz metamaterial, at concentrations of 0, 1, 2, 5, 10, 15, and 20 mg/L in the THz region of 0.6 to 1.0 THz [38]Back to article page