[OPTICAL REVIEW Vol. 4, No. 1B (1997) 195-198]

A Superresolution Optical Disk with a Combination of Optical Path Filtering and Saturable Absorption Techniques

Yihong WU1 and Chong Tow CHONG2

1Department of Electrical Engineering, 2Data Storage Institute, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260

(Received October 21, 1996; Accepted December 13, 1996)

Calculations have been done for the modulation transfer function of a superresolution optical disk with a combination of optical path filtering and saturable absorption techniques. The results reveal that optical path filtering alone can only equalize, to a certain degree, the spatial frequency response of the optical disk system, but it can not attain any response beyond the cutoff frequency. With an additional saturable absorption layer in-between the substrate and the information layer, it is found that the optical response both under and beyond the cutoff frequency can be greatly improved.

Key words : optical disk, superresolution, optical path filtering, saturable absorption