Theoretical study of optical recording with a solid immersion lens illuminated by focused double-ring-shaped radially-polarized beam |
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Authors: | Yaoju Zhang Xun Xu Yoichi Okuno |
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Institution: | aCollege of Physics and Electronic Information, Wenzhou University, Wenzhou 325035, China;bGraduate School of Science and Technology and Department of Electrical and Computer Engineering, Kumamoto University, Kumamoto, Japan |
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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 ( and modes). Numerical results show that a double-ring-shaped mode focusing has some excellent features in near-field optical storage, compared with a single-ring-shaped 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 mode focusing. |
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Keywords: | Near-field optical storage Higher-order radially-polarized beam Solid immersion lens Vector diffraction |
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