Abstract
Based on the Richards–Wolf vector diffraction theory, the intensity distributions in the recording sample near a solid immersion lens are calculated for two different radially-polarized beams ( R- TEM 11 ∗ and R- TEM 01 ∗ modes). Numerical results show that a double-ring-shaped R- TEM 11 ∗ mode focusing has some excellent features in near-field optical storage, compared with a single-ring-shaped R- TEM 01 ∗ mode focusing. The recording density is markedly improved, the focal depth of the near-field recording system is substantially increased, and a subsurface recording is effectively obtained using the R- TEM 11 ∗ mode focusing.
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