New approach to three-dimensional superresolution in optical data storage

摘要

We present a new kind of annular beam which consists of two bright rings with asymmetric intensity for increasing three-dimensional resolving capacity of imaging systems. It is shown that by changing the intensity ratio between the two bright rings the distribution of the spatial frequency of the light can be well adjusted and subsequently different superresolution performance including three-dimensional superresolution can be attained. Simulation results have exemplified that with appropriate asymmetric intensity ratio the transverse and axial superresolution can be achieved simultaneously. Moreover, the new annular beam can produce attractively higher Strehl ratio than the tunable leaky pupil under the same three-dimensional superresolution gain.