Fig. 1. Electromagnetic spectrum

Fig. 2. THz generation using (a) photoconductive antenna and (b) optical rectification; THz detection using (c) photoconductive antenna and (d) EOS

Fig. 3. Terahertz time-domain spectroscopy system
(a): Transmission; (b): Reflection

Fig. 4. (a) Schematic diagram of loop-shaped absorber; (b) Schematic diagram of three-split ring resonators

Fig. 5. Schematic diagram of single-pixel imaging based on THz-TDS