Improving the recording ability of a near-field optical storage system by higher-order radially polarized beams

Yaoju Zhang; Jianping Bai

doi:10.1364/oe.17.003698

Improving the recording ability of a near-field optical storage system by higher-order radially polarized beams

Opt Express. 2009 Mar 2;17(5):3698-706. doi: 10.1364/oe.17.003698.

Authors

Yaoju Zhang¹, Jianping Bai

Affiliation

¹ College of Physics and Electronic Information, Wenzhou University, Wenzhou 325035, China. zhangyaoju@sohu.com

PMID: 19259210
DOI: 10.1364/oe.17.003698

Abstract

Distributions of the optical field in a solid immersion lens recording system are calculated for higher-order radially polarized modes of the incidence. Results show that two higher-order radially polarized modes of R-TEM(11) (* )and R-TEM(21) * are useful to near-field optical recording, but further higher-order modes such as R-TEM(31) (* ), R-TEM(41) (* ), and R-TEM(51) (* ) are not useful due to the strong side-lobe intensity. Compared with R-TEM(01) (* ) beam focusing, the full width at half-maximum of the recording spot is decreased markedly and the focal depth is increased substantially by using R-TEM(11) (* )beam focusing. The effect of the beam width of the R-TEM(11) (* ) mode is also discussed.