Abstract

The low frequency noise of super-resolution near-field structure disc with platinum oxide layer was analyzed and reduced. The origin of the noise at low frequency region was found to be from the blank state, and the noise becomes high due to the high readout power for the super-resolution readout. We succeeded in reducing the low frequency noise from 25 dB to 20 and 16 dB by the reduction of super-resolution readout power from 2.6 mW to 2.2 and 1.4 mW. As a result signal uniformity of super-resolution signal was greatly improved. The reduction of readout power was achieved just by the optimization of film thickness without a major material change in the structure.

© 2005 Optical Society of America