Abstract
In a high-numerical-aperture optical head using a solid immersion lens (SIL), it is anticipated that the polarization of the diffracted beam is disturbed, this affects the signals. To study this problem, a rigorous simulator based on the three-dimensional vector diffraction theory has been developed. Polarization disturbance for various NAs has been estimated and it has been clarified that the polarization is disturbed not only in the SIL head but also in the conventional high-NA head whose disk substrate is not covered with protective glass. The influence of polarization disturbance on the readout signals has been determined and discussed for the various polarizations.
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