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We developed a multilayer optical head with a planar structure that was designed using the finite-difference time domain (FDTD) method for hybrid recording. This optical head has a butted-grating structure, including its central and side parts. We initially discuss the advantages of the method of end-fire coupling for using the planar optical head. Second, we briefly explain our optical head and demonstrate how it can project a single-peak spot, even if multimode light is supplied by end-fire coupling that can be used. Finally, we present details on the asymmetric butted-grating optical head to position the output beam close to the magnetic writer pole in practical use.

Multilayer Optical Head Using Butted-grating for Hybrid Recording