Fig. 1. Schematic diagram of one-dimensional SWG

Fig. 2. Reflection spectra of GaN-based SWG. (a) Reflection spectra in Ref. [19]. (b) reflection spectra obtained by simulation

Fig. 3. Structure of one-dimensional TiO₂ SWG

Fig. 4. Reflection spectra of TE polarization and TM polarization in TiO₂ SWG

Fig. 5. TM polarization reflection spectra of TiO₂ SWG at different diffraction orders

Fig. 6. TE polarization reflection spectra of TiO₂ SWG at different diffraction orders

Fig. 7. Reflection spectra under different grating periods when grating height is 0.25 μm and duty cycle is 0.34. (a) Full reflection spectra; (b) magnified view of top of reflection spectra

Fig. 8. Reflection spectra when grating height is 0.25 μm, duty cycle is 0.34, and period range is 0.488--0.496 μm

Fig. 9. Reflection spectra under different grating duty cycles when grating height is 0.49 μm and height is 0.25 μm. (a) Full reflection spectra; (b) magnified view of top of reflection spectra

Fig. 10. Reflection spectra under different grating heights when grating period is 0.49 μm and duty cycle is 0.34. (a) Full reflection spectra; (b) magnified view of top of reflection spectra

Fig. 11. Reflection spectra when grating period is 0.49 μm, duty cycle is 0.34, and grating height range is 0.243--0.255 μm