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The optical near-­field close to a nanostructure aperture is studied to generate a confined circularly polarized light for high density all-­optical magnetic recording. It is revealed that a plasmon four-­leaf clover aperture with magnetic particle media is able to create confined circularly polarized light. The four-­leaf clover aperture combined with a square pattern particle medium can create confined circularly polarized light within 15 nm of spot diameter. It is also found that an off-­track of 7.5 nm can be allowed in the proposed configuration. A four-­leaf clover aperture is one of effective local surface plasmon transducers for all-­optical magnetic recording.

Dependence of Circularly Polarized Light Excited by Plasmon Aperture on Relative Position to Magnetic Particles for All-Optical Magnetic Recording