Fig. 1. Schematic of multi-circular optical phased array

Fig. 2. Far-field pattern of multi-circular array

Fig. 3. Flow chart of sidelobe suppression for the multi-circular array

Fig. 4. Schematic of uniform multi-circular optical phased array

Fig. 5. Schematic of the multi-circular array after optimizing the radius

Fig. 6. Far-field pattern of multi-circular array after optimizing radius

Fig. 7. Comparison diagram of convergent curves of genetic algorithms

Fig. 8. Excitation distribution of the elements after optimization. (a) θ₀=0°; (b) θ₀=15°; (c) θ₀=30°; (d) θ₀=45°

Fig. 9. Far-field pattern after optimizing excitation. (a) Primary view at θ₀=0°; (b) side view at θ₀=0°; (c) primary view at θ₀=15°; (d) side view at θ₀=15°; (e) primary view at θ₀=30°; (f) side view at θ₀=30°; (g) primary view at θ₀=45°; (h) side view at θ₀=45°

Fig. 10. Multi-circular array and its far-field pattern before optimization. (a) Multi-circular array before optimization; (b) far-field pattern of a multi-circular array before optimization

Fig. 11. Multi-circular array and its far-field pattern after optimization. (a) Multi-circular array after optimization; (b) far-field pattern of a multi-circular array after optimization

Fig. 12. Schematic structure of 64-channel two-dimensional optical phased array experimental system

Fig. 13. Experimental platform for 64-channel two-dimensional optical phased array