Proposal for one-beam microholographic recording using radially polarized light beam

Microholographic recording is promising for realizing next-generation optical data storage systems because of its affinity with conventional optical disk systems. One of the problems of the microholographic recording is that two beams are necessary for recording. This paper proposes a novel microholographic recording using only one beam for recording. In the recording process, a radially polarized light beam is used. A microhologram whose grating vector is perpendicular to the optical axis is formed in the recording medium, in contrast to the conventional microholographic recording in which the grating vector of the microhologram is parallel to the optical axis. In the readout process, a circularly polarized vortex light beam is used. A diffracted beam is generated in the transmission direction, in contrast to the conventional microholographic recording in which it is generated in the reflection direction. The diffracted beam is detected and discriminated from a non-diffracted beam. A readout signal simulation using a vectorial coupled wave theory has demonstrated the validity of this technology.

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