Photonic crystal sensor based on Fano resonances for simultaneous detection of refractive index and temperature

被引：16

作者：

Wang, Shutao ^{[1
]}

Cheng, Qi ^{[1
]}

Lv, Jiangtao ^{[2
]}

Wang, Junzhu ^{[1
]}

机构：

[1] Yanshan Univ, Measurement Technol & Instrumentat Key Lab Hebei, Qinhuangdao 066004, Hebei, Peoples R China

[2] Northeastern Univ Qinhuangdao, Sch Control Engn, Qinhuangdao 066004, Hebei, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2020年 / 128卷 / 03期

基金：

中国国家自然科学基金;

关键词：

HIGH-SENSITIVITY; LIQUID CONCENTRATION; SLAB;

D O I：

10.1063/5.0010586

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A structure for simultaneous measurement of refractive index (RI) and temperature (T) is proposed based on photonic crystal (PhC) beam structures. The sensor structure consists of three parallel 1D PhC cavities, in which the middle cavity 1 has a wide linewidth, and cavity 2 and cavity 3 on both sides have a narrow linewidth. By changing the RI of the analyte and the T of the ambient, we explored the linear relationship between the two parameters and resonant wavelengths, respectively. For cavity 2 with air mode, the RI and T sensitivities are 377.2nm/RIU and 101pm/K, respectively. For cavity 3 with dielectric mode, the RI and T sensitivities are 194nm/RIU and 261pm/K, respectively. In addition, we also discussed the crosstalk between two adjacent cavities at different RI and T, and all crosstalk values are lower than -7dB and -6dB for RI and T, respectively. Compared with previous sensor structures, the proposed sensor structure could be used in simultaneous RI and T sensing with higher sensitivity and lower crosstalk values.

引用

页数：7

共 35 条

[1] Ultra-high sensitive 1D porous silicon photonic crystal sensor based on the coupling of Tamm/Fano resonances in the mid-infrared region [J].