Fig. 3

Variation of the intensity with the different NA of the left-hand CPAVBs with m = 1 and m = 4, respectively. a-1 and a-2, b-1 and b-2, and c-1 and c-2 are NA = 0.7, 0.75, 0.8, respectively. d-1 and d-2 Cross-section of the intensity