Fig. 1. Structure diagram of SPRG

Fig. 2. Out-of-light intensity distribution after SRPG

Fig. 3. Transmittance and extinction ratio of Al, Ag, Au metal gratings

Fig. 4. Relationship between grating polarization characteristics and ridge height

Fig. 5. Relationship between polarization characteristics and period of grating with different duty ratios

Fig. 6. Relationship between polarization characteristics of grating and duty cycle under different periodic conditions

Fig. 7. Refractive index of Al

Fig. 8. Relationship between grating polarization characteristics and incident light wavelength

Fig. 9. Actual sample and metal grating unit of SRPG

Fig. 10. TM transmittance and extinction ratio experimental device diagram of SRPG

Fig. 11. Radial polarization performance experimental device diagram of SRPG

Fig. 12. Outburst light intensity distribution after SRPG detection