Abstract
We propose and numerically investigate a refractive index sensor based on a one-dimensional slotted photonic crystal nanobeam cavity with sidewall gratings for refractive index sensing in a gaseous environment. By using the three-dimensional finite-difference time-domain method, we demonstrate that our proposed sensor simultaneously possesses a high quality factor of $ 3.71 \times {10^6} $ and a high sensitivity of 508 nm/RIU (refractive index unit) at the resonant wavelength near 1583 nm, yielding a detection limit as low as $ 1.97 \times {10^{ - 6}} $ RIU. Moreover, the mode volume of the cavity’s fundamental resonant mode is found to be as small as $ 0.022(\lambda /n)^3 $, resulting in a very compact effective sensing area. We finally study and assess the effect of fabrication disorder on the performances of our proposed sensor. We believe our proposed sensor will be a promising candidate for applications not only in multiplexed biochemical sensing and multielement mixture detection, but also in optical trapping of single biomolecules or nanoparticles.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Chao-Sheng Deng, Ming-Jun Li, Jie Peng, Wen-Liang Liu, and Jian-Xin Zhong
J. Opt. Soc. Am. B 34(8) 1624-1631 (2017)
Xiang Hu, Yanchao Hu, Wenhao Zhang, Jing Hu, Feng Li, Wei Su, and Hong Wu
Appl. Opt. 62(32) 8593-8599 (2023)
Daquan Yang, Huiping Tian, and Yuefeng Ji
Appl. Opt. 54(1) 1-5 (2015)