Abstract
Abstract The near field optical throughput of the nano-aperture with different surrounded surface corrugation structures including triangle, trapezoidal and rectangle geometries was investigated by Finite Differential Time Domain(FDTD) method. The highest throughput was proved obtainable in triangle shape structure. Different grating structure has different optimal grating pitch and grating depth. For the trapezoidal and rectangle profile structures at deeper grooves, the surface plasmon effect is more complicated than sinusoidal profile grating which is the case frequently used for theoretical analysis. The reason for this phenomenon is also explained in this paper. Key words : Near-field Optics, Surface Plasmons Polariton, Optical Data Storage, Heat Assisted Magnetic Recording(HAMR), Finite Difference Time Domain(FDTD) . 1. Introduction The demand to higher date storage capacity has pushed people to research on higher density data storage technologies. In optical data storage, the density is limited by the optical beam spot size. The smallest beam spot size in the far-field optical system is limited in half wavelength because of the diffraction. To further increase the density, near field optical method should be used. In the magnetic data storage, superparamagnetic effect has been becoming the barrier for further high density recording. In order to overcome this effect, the approach called Heat Assisted Magnetic Recording (HAMR) has been proposed[1]. In this method, nano-size optical beam spot is also needed to obtain recording density beyond Tb/in
Published Version
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