Fig. 1. (a) VCSEL with a oxide aperture^[13]; (b) Introducing phase shift mesa and selective Fermi level pinning interface in the laser cavity of VCSEL^[20]; (c) Upper DBR of VCSEL introduces single defect photonic crystal microstructure^[22-25]; (d) An anti-phase layer is introduced on the upper DBR surface of VCSEL^[28-30]; (e) Vertical cavity with a diffraction grating^[35]; (f) Vertical cavity with a metal layer^[36-38]

Fig. 2. (a) Vertical cavities with subwavelength gratings to realize a monolithic multi-wavelength filter array^[39]; (b) Monolithic multi-wavelength filter array with different cavity lengths by 3D nano imprint technology^[40]

Fig. 2. [in Chinese]

Fig. 3. (a) Schematic of HCG-VCSEL^[53]; (b) Schematic of HCG-VCSEL with beam shaping and far field profiles^[57]; (c) Schematic of Si-based HCG-VCSEL (SOI-based HCG for reflector and coupler)^[60]; (d) Schematic of polariton laser^[64]

Fig. 4. (a) Schematic of filter with double one-dimensional HCGs^[76]; (b) Schematic of filter with cross-stacked double one-dimensional HCGs^[77]