Effect of edge rounding and sloping of sidewalls on the readout signal of the information pits on optical disks

Yajun Li; Hungte Lee; Emil Wolf

doi:10.1117/1.1596938

1 September 2003 Effect of edge rounding and sloping of sidewalls on the readout signal of the information pits on optical disks

Yajun Li, Hungte Lee, Emil Wolf

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Optical Engineering, Vol. 42, Issue 9, (September 2003). https://doi.org/10.1117/1.1596938

The height profile of information pits (or bumps) on the data surface of an optical disk is assumed in most publications to be either rectangular or trapezoidal. Currently, when bumps or pits on an optical disk are produced by using a photoresist technique, their height profile is inevitably "rounded." Moreover, in plastics molding practice, edge rounding and sloping sidewalls of pits are advantageous factors to avoid the sharp edge becoming damaged when the replica is removed from the mold. A new expression for the height profile of pits is obtained that provides a convenient description of the geometry of the pits with different degrees of edge rounding and sloping of sidewalls. We find that λ/4-deep pits are optimum for the readout signal only when the pits have rectangular profile and are illuminated by a focused uniform beam. The optimum pit depth increases to an even greater value when edge rounding and sloping of sidewalls are taken into account.

©(2003) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Yajun Li, Hungte Lee, and Emil Wolf "Effect of edge rounding and sloping of sidewalls on the readout signal of the information pits on optical disks," Optical Engineering 42(9), (1 September 2003). https://doi.org/10.1117/1.1596938

Published: 1 September 2003

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