We present a novel (to the best of our knowledge) composite nanostructure composed of bowtie nanoantennas (BNAs) and rectangular nanoapertures, which provides a new way to improve the ability of the nanostructure to enhance the optical near field and obtain uniform near-field distribution in the z direction. It is specifically engineered to not only confine the incident light in the nanoscale but also to generate large localized near-field enhancement about 25 times larger than that of solitary BNAs. It also shows a more uniform near-field distribution in the z direction than that of solitary BNAs. The mechanisms of the large enhancement and the uniform near field are also discussed.
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