Fig. 1. Diagram of generation of Bessel beams. (a) Schematic diagram of SLM device; (b) schematic diagram of axicon device

Fig. 2. Relationship between cross-correlation coefficient and propagation distance and cross-sectional intensity distribution of reconstructed Bessel beam as zeroth-order Bessel beam is blocked by on-axis circular obstacle with radius of 100μm. (a) Cross-sectional intensity distribution of reconstructed Bessel beam at z=-1mm; (b) relationship between cross-correlation coefficient of reconstructed Bessel beam and original one and propagation distance; (c) cross-sectional intensity distribution of reconstructed Bessel beam at z=14mm

Fig. 3. Relationship between recovery distance of blocked zeroth-order Bessel beam and sizes of obstacles. (a) Circle obstacles; (b) square obstacles

Fig. 4. Relationship between recovery distance of blocked first-order Bessel beam and sizes of obstacles. (a) Circle obstacles; (b) square obstacles

Fig. 5. Relationship between recovery distances needed for zeroth-order and first-order Bessel beams and off-axis offset of circle obstacle with radius of 100μm

Fig. 6. Recovery distances needed for different-order Bessel beams blocked by on-axis circle obstacle with radius of 100μm

Fig. 7. Schematic of experimental system. (a) Simulation diagram of Bessel beam; (b) superimposed phase hologram of axicon phase and vortex beam phase

Fig. 8. Cross section intensity distributions of Bessel beams at different situations. (a) Original zeroth-order Bessel beam; (b) zeroth-order Bessel beam blocked by on-axis circle obstacle with radius of 100μm;(c) reconstructed Bessel beam with recovery distance of 43mm;(d) original first-order Bessel beam; (e) first-order Bessel beam blocked by on-axis circle obstacle with radius of 100μm;(f) reconstructed Bessel beam with recovery distance of 42.5mm

Fig. 9. Relationship between recovery distances and sizes of circle and square obstacles. (a) Zeroth-order Bessel beam; (b) first-order Bessel beam

Fig. 10. Relationship between recovery distance and off-axis offset of circle obstacle with radius of 100μm

Fig. 11. Recovery distance needed for different-order Bessel beams blocked by on-axis circle obstacle with radius of 100μm