Abstract
The signal to noise ratio (SNR) for the near field optical reading is important factor to realize the two-dimensional terabyte optical memory system with a Vertical Cavity Surface-Emitting Laser (VCSEL) and a near-field optical probe array. The SNR of the reading head using a GaP probe with 200nm aperture size with high optical throughput was evaluated as 15.56dB. The SNR of the GaP probe head was increased more than 5dB compared to that of a Si probe. It was observed that the SNR depended on the optical throughput of the probe. The High SNR was demonstrated by using GaP probe of high optical throughput.
