Extraordinary transmission from high-gain nanoaperture antennas

Kinzel, Edward C.; Srisungsitthisunti, Pornsak; Yan Li; Raman, Arvind; Xianfan Xu
May 2010
Applied Physics Letters;5/24/2010, Vol. 96 Issue 21, p211116
Academic Journal
This letter describes a bowtie nanoaperture antenna for coupling light to a subdiffraction limited near-field spot (<λ/8). The gain of the antenna is increased using a concentric grating structure to coherently diffract normally incident light toward the aperture. We experimentally demonstrate that the addition of the grating structure enhances the far-field transmission through the aperture by 6.9 times while the intensity at the near-field is increased more than 15 times. The nanoantenna is useful for applications including nanolithography and data storage.


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