Optical Refractive Index Sensing Based on High-Q Bound States in the Continuum in Free-Space Coupled Photonic Crystal Slabs
Document Type
Article
Source Publication Title
Sensors
First Page
1
Last Page
12
DOI
http://dx.doi.org/10.1038/s41598-017-10653-y
Abstract
High sensitivity (S) and high quality factor (Q) are desirable to achieve low detection limit in label-free optical sensors. In this paper, we theoretically demonstrate that single-layer and coupled bi-layer photonic crystal slabs (PCS) possess simultaneously high S and high Q near the bound states in the continuum (BIC). We theoretically achieved S > 800 nm/RIU and Q > 107 in refractive index sensing in the 1400–1600 nm telecom optical wavelength bands. We experimentally demonstrated an S of 94 nm/RIU and a Q of 1.2 x 104, with a detection limit of 6 X10 -5 refractive index unit. These sensor designs can find applications in biochemical sensing, environmental monitoring, and healthcare.
Disciplines
Electrical and Computer Engineering | Engineering
Publication Date
8-11-2017
Language
English
License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Liu, Yonghao; Zhou, Weidong; and Sun, Yuze, "Optical Refractive Index Sensing Based on High-Q Bound States in the Continuum in Free-Space Coupled Photonic Crystal Slabs" (2017). Electrical Engineering Faculty Publications. 38.
https://mavmatrix.uta.edu/electricaleng_facpubs/38