期刊
OPTICS COMMUNICATIONS
卷 335, 期 -, 页码 73-77出版社
ELSEVIER
DOI: 10.1016/j.optcom.2014.09.014
关键词
Optical sensing and sensors; Ring-slot structure; Coupled resonators; Resonators; Photonic crystals
类别
资金
- NSFC [61372038]
- National 973 Program [2012CB315705]
- National 863 Program [2011AA010306]
- Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), P. R. China
We propose a label-free refractive index (RI) sensor based on a high-Q photonic crystal (PhC) ring-slot resonator. The proposed device consists of a ring-slot cavity, in which light is coupled input and output by using a PhC line defect waveguide (W-1). By using two dimensional finite-difference time-domain (2D -FDTD) simulation, we show that a Q-factor as high as 107 is achieved when the width (w) of ring-slot equals to 0.20a and the radius of center air hole inner ring-slot equals to 0.34a. Even though the refractive index (RI) equals to 1.330 (water surroundings) at telecom wavelength range, Q of similar to 11477.3 can also be achieved when the width of ring-slot equals to 0.28a. The RI sensitivity (S) equals to 160 nm/RID (refractive index unit) and the detect limit (DL) of 8.75 x 10(-5) RID is obtained. These suggest that the design is a promising candidate for label-free biosensing in medical diagnosis, life science and environmental monitoring. (C) 2014 Elsevier B.V. All rights reserved.
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