Abstract
We investigated the near-field enhancement of a localized surface plasmon resonance (LSPR) structure based on gold nanograting pairs with a nanosized gap. The results calculated by finite-difference time-domain and rigorous coupled-wave analysis methods presented that the nanogap enclosed by two neighboring nanogratings produced significant confinement and enhancement of electromagnetic fields and allowed a sensitive detection in sensing of surface binding events. Gold gratings with a narrow gap distance less than 10 nm showed enhanced refractive index sensitivity due to the intensified optical field at the nanogap, outperforming the LSPR structure with noninteracting nanogratings. Also, we analyzed the effectiveness of using an overlap integral (OI) between analyte and local plasmon field to estimate the detection sensitivity. We found a strong correlation of field–analyte OI with far-field sensor sensitivity.
© 2012 Optical Society of America
Full Article | PDF ArticleMore Like This
Nak-Hyeon Kim, Woo Kyung Jung, and Kyung Min Byun
Appl. Opt. 50(25) 4982-4988 (2011)
Seong Min Jang, Donghyun Kim, Seung Ho Choi, Kyung Min Byun, and Sung June Kim
Appl. Opt. 50(18) 2846-2854 (2011)
Sherif H. El-Gohary, Jong Min Choi, Nak-Hyeon Kim, and Kyung Min Byun
Appl. Opt. 53(10) 2152-2157 (2014)