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.
© 2011 Optical Society of America
Original Manuscript: July 8, 2011
Revised Manuscript: September 13, 2011
Manuscript Accepted: September 15, 2011
Published: October 6, 2011
Jianxiong Li, Shuqi Chen, Ping Yu, Hua Cheng, Wenyuan Zhou, and Jianguo Tian, "Large enhancement and uniform distribution of optical near field through combining periodic bowtie nanoantenna with rectangular nanoaperture array," Opt. Lett. 36, 4014-4016 (2011)