Fig. 1. Structure of ghost imaging principle

Fig. 2. Experimental setup of THz active ghost imaging. (a) Principle diagram; (b) picture of experimental setup

Fig. 3. Experimental setups for obtaining measurement matrix. (a) Scanning method; (b) imaging-transformation method

Fig. 4. Pixel number conversion of measurement matrix

Fig. 5. Comparison of simulated and scanning optical field. (a) Actual image of amplitude-modulated plate;(b) simulated optical field of image transformation; (c) scanning optical field

Fig. 6. Resolution plate

Fig. 7. Imaging results of double slits. (a)(b) Imaging results of scanning measurement matrix when δ=12-8 mm and N=800, and normalized projection curves; (c)(d) imaging results of imaging-transformation measurement matrix when δ=10-6 mm and N=1800, and normalized projection curves; (e) relationship between δ and r

Fig. 8. Relationship between δ and r with different N

Fig. 9. Imaging results of double slits with different P

Fig. 10. Relationship between δ and r with different P. (a) Ideal lens; (b) actual lens

Fig. 11. Imaging results with different F. (a) F=50×50; (b) F=110×110;(c) F=200×200; (d) relationship between δ and r

Fig. 12. Imaging results with different A. (a) A=30×30; (b) A=50×50; (c) A=100×100;(d) A=200×200; (e) relationship between δ and r

Fig. 13. Imaging results of double slits with δ=7 mm at different detector positions. (a)-(e) Imaging results at different detector positions; (f) imaging result when S=6 mm×6 mm; (g) correspondence relationship of positions of five detectors