Fig. 1. MERSI-III optical layout

Fig. 2. The schematic view of a metallic layer included coating system

Fig. 3. The schematic view of the electric vectors for the oblique incident light

Fig. 4. The fitted optical constants of Ag film

Fig. 5. The fitted optical constants of ZnS film

Fig. 6. （a） The transmission spectra of the induced film structure；（b） The reflection spectra of the induced film structure

Fig. 7. The calculated transmission and reflection curves of the ultra-broadband dichroic beam-splitter with low polarization

Fig. 8. The calculated LPS of dichroic beam-splitter in visible/ near infrared region

Fig. 9. The measured transmission and reflection curves of the dichroic beam-splitter

Fig. 10. The LPS curve of the dichroic beam-splitter