Enhanced Nano-size Circularly Polarized Light Generated by Cross V-groove Aperture Antenna

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In the last decade, the circularly polarized light has been widely used in various novel applications, such as probing the geometric and electromagnetic chiral properties of biomolecules [1], all-optical magnetic recording [2] and control of the spin-wave emission [3] in submicron regions. To implement those researches in nano-regions, it is essential to generate nano-size circularly polarized light. Nakagawa et al. [4] has reported that nano-size circularly polarized light could be generated with a cross aperture antenna. However, the intensity of generated circularly polarized light is not enhanced. Here, we propose a new type cross V-groove aperture antenna with a diameter of 10 nm, which could generate circularly polarized light, with its intensity enhanced more than 1000 times.

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