Figure 7

Extracted radial phase shift profiles for the interference patterns of Fig. 6. The profiles follow the axicon type for low voltages whereas that of logarithmic axicons for voltages higher than 1.8 V.

Extracted radial phase shift profiles for the interference patterns of Fig. 6. The profiles follow the axicon type for low voltages whereas that of logarithmic axicons for voltages higher than 1.8 V.