Polarization Analyses of Readout Signals in Phase Change Material Incorporating a Solid Immersion Lens (SIL)
NATIONAL CHIAO TUNG UNIV HSINCHU (TAIWAN) INST OF ELECTRO-OPTICAL ENGINEERING
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Comprehensive analyses based on rigorous vector diffraction theory have been presented to simulate the readout signal contrast using SIL in reading phase change recording disk. De-polarized reflected light y-polarized from x-polarized incident beam results in the reduction of total signal contrast and becomes more obvious for high numerical aperture NA systems. Due to the signal degradation from de-polarized reflected light, filtering de-polarized light is applied to signal detection. The x-polarized contrast is a factor 1.0 to 1.35 higher than the conventional detection contrast xy polarized at different gap widths, at a cost of 0 to 25 percent total intensity reduction.
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