All-dielectric refractive index sensor based on Fano resonance with high sensitivity in the mid-infrared region

Results in Physics

Yandong Fan¹  Xiaoyan Shi²  Zheng Qin³  Zhongzhu Liang³  Yuhao Zhang⁴  David R. Smith⁴  Dejia Meng⁴  Enzhu Hou⁴ 

[1] Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, College of Physics, Northeast Normal University, Changchun 130024, China;Corresponding author at: State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China.;University of the Chinese Academy of Sciences, Beijing 100049, China;State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130033, China;

关键词: Refractive index sensor;    All-dielectric;    Fano resonance;    Mid-infrared region;   

DOI  :  

来源: DOAJ

【 摘 要 】

We design and numerically analyze a Fano resonance device based on periodical all-dielectric “lucky knot” shaped nanostructure in the mid-infrared region with high sensitivity, which is insensitive to polarization and incident angle. The proposed nanostructure is sensitive to the change of the refractive index of the substance to be tested. We established the correspondence between the change of the refractive index and the peak position of the reflection spectrum. And then we propose an optical refractive index sensor with a sensitivity of 986 nm/RIU, and a maximum figure of merit of 32.7, which is much higher compared to the sensor based on metallic materials. The maximum Q-factor can reach 520. This study may provide a further step in optical sensing, biosensing and environmental monitoring.

【 授权许可】

Unknown