Fig. 1. LDW with two laser beams^[15-21]

Fig. 2. Multi-channels LDW technique^[24-27]

Fig. 3. Principle of TP-LDW, PPI-LDW, and multi-channel PPI-LDW^[30]

Fig. 4. Jablonski plot of PPI photoresist (Rim-P) and two writing mode (oil mode & dip-in mode)

Fig. 5. 3D hollow spot. (a) Schematic of 3D hollow spot modulated with SLM; (b) modulation module of 3D hollow spot; (c) intensity distribution of 3D hollow spot in front focal plane of objective lens; (d) linewidth corresponding to inhibition laser off or on

Fig. 6. Beam stabilization. (a) Schematic of beam stabilization module; (b) position and (c) angle drift of beam without drift control;(d) position and (e) angle drift of beam with drift control

Fig. 7. Six channels LDW. (a) Schematic of six channels LDW system; (b) CAD module corresponding to Fig. 7(a), the inset is photo of real product; (c) six channels excitation and inhibition beams generated by SLM

Fig. 8. Different micro/nano-structure devices written by PPI-LDW