Fig. 1. Comparison of platform and integrated systems. (a) Spatial optical links; (b) typical structure of optical fiber integrated atomic gas chamber; (c) optical fiber end-face integrated metasurface; (d) fiber-to-metasurface bonding

Fig. 2. Architecture diagram of proposed system

Fig. 3. Transmission phase. (a)‒(b) Phase conditions of dual-wavelength laser collimation metasurface; (c)‒(d) dual-wavelength phase difference

Fig. 4. Metasurface structure. (a) Dual-wavelength laser collimation metasurface; (b) unit cell of metasurface

Fig. 5. Field distribution and amplitude-phase curves. (a) Internal field distribution in dielectric column. (b) variation of transmission phase and amplitude of metasurface unit with width W

Fig. 6. Distribution value of theoretical phase and metasurface unit phase. (a) Theoretical value of 852 nm wavelength beam focusing phase distribution; (b) metasurface unit phase distribution value under irradiation of 852 nm wavelength beam; (c) phase deviation of 852 nm wavelength beam; (d) theoretical value of 510 nm wavelength beam focusing phase distribution; (e) metasurface unit phase distribution value under irradiation of 510 nm wavelength beam; (f) phase deviation of 510 nm wavelength beam

Fig. 7. Transmission phase varies with H. (a) Dual-wavelength transmission phase difference; (b) dual-wavelength transmission phase value; (c)‒(g) phase deviation when H is 1100‒1500 nm

Fig. 8. Transmission phase varies with P. (a) Dual-wavelength transmission phase difference; (b) dual-wavelength transmission phase value; (c)‒(g) phase deviation when P is 230‒270 nm

Fig. 9. Theoretical calculation and simulation results of focusing field distribution. (a) Focused field distribution of beam at wavelengths of 510 nm and 852 nm; (b) field intensity value at center of light field in direction of beam propagation

Fig. 10. Theoretical calculation and simulation results of focusing field. (a) Field intensity value at center of light field in direction of 510 nm wavelength beam propagation; (b) Field intensity value at center of light field in direction of 852 nm wavelength beam propagation

Fig. 11. Dual-wavelength focusing when F=100 μm and metasurface size is 50 μm×50 μm. (a)(b) Focusing field; (c)(d) focal cross section light intensity distribution

Fig. 12. Focusing performance of dual-wavelength laser after tuning

Fig. 13. Achromatic performance of light beams of different wavelengths. (a) Confocal collimation of 480 nm and 780 nm wavelength beams; (b) phase deviation of beam in wavelength range of 600~1200 nm (relative to 500 nm)