Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1534178 | Optics Communications | 2015 | 5 Pages |
Abstract
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 (W1). 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 ~11477.3 can also be achieved when the width of ring-slot equals to 0.28a. The RI sensitivity (S) equals to 160Â nm/RIU (refractive index unit) and the detect limit (DL) of 8.75Ã10â5 RIU is obtained. These suggest that the design is a promising candidate for label-free biosensing in medical diagnosis, life science and environmental monitoring.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Lijun Huang, Huiping Tian, Jian Zhou, Qi Liu, Pan Zhang, Yuefeng Ji,