Reported is an investigation into the effect of spherical aberration caused by the mismatch of the refractive indices between the recording material and its immersion medium on the three-dimensional optical data-storage density in a two-photon bleaching polymer. It is found both theoretically and experimentally that spherical aberration can be compensated for by a change in the tube length at which a microscope objective is operated in recording and reading processes. After compensation for the spherical aberration it is possible to achieve a three-dimensional recording density of 3.5 Tbits/cm<sup>3</sup> for a commercial objective with a numerical aperture of 1.4.
© 1998 Optical Society of America
Daniel Day and Min Gu, "Effects of Refractive-Index Mismatch on Three-Dimensional Optical Data-Storage Density in a Two-Photon Bleaching Polymer," Appl. Opt. 37, 6299-6304 (1998)