Nanoscale ridge aperture as near-field transducer for heat-assisted magnetic recording.
Nanoscale ridge aperture as near-field transducer for heat-assisted magnetic recording.
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DOI：
10.1364/ao.50.000g42
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发表时间：
2011-11
期刊：
影响因子：
1.9
通讯作者：
Nan Zhou;E. Kinzel;Xianfan Xu
中科院分区：
文献类型：
--
作者：
Nan Zhou;E. Kinzel;Xianfan Xu
基于纳米级光学天线的近场传感器已被证明可以产生远低于衍射极限的高透射率和强局部光点。本文将纳米脊形孔径天线作为热辅助磁记录的近场换能器。对脊形光阑产生的光斑尺寸和透射效率进行了数值研究。我们表明，脊孔在一个蝴蝶结或半蝴蝶结形状能够产生小的光点，以及细长的光点与磁记录所需的纵横比。通过在孔周围增加凹槽可以提高传输效率。
Near-field transducer based on nanoscale optical antenna has been shown to generate high transmission and strongly localized optical spots well below the diffraction limit. In this paper, nanoscale ridge aperture antenna is considered as near-field transducer for heat-assisted magnetic recording. The spot size and transmission efficiency produced by ridge aperture are numerically studied. We show that the ridge apertures in a bowtie or half-bowtie shape are capable of generating small optical spots as well as elongated optical spots with desired aspect ratios for magnetic recording. The transmission efficiency can be improved by adding grooves around the apertures.