1.Centre for THz Research, China Jiliang University, Hangzhou 310018, China 2.Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 61871355, 61831012, 51704267) and the Natural Science Foundation of Zhejiang Province, China (Grant Nos. LY18F010016, LY17E04002)
Received Date:04 July 2019
Accepted Date:15 August 2019
Available Online:01 October 2019
Published Online:20 October 2019
Abstract:Refractive index sensing is attracting extensive attention in biochemical sensing using terahertz technology. Various structures with strong confinements have been used to design sensors for improving the interaction between the terahertz wave field and the analytes, such as photonic crystals, nanowires, plasmonic structures, and metamaterials. Terahertz wave sensors based on two-dimensional photonic crystal have been used in various areas ranging from disease diagnostics to environmental pollution detection. For improving the performance of terahertz sensor, a sensing scheme based on high-density polyethylene sunflower-typecircular photonic crystal structure is proposed. The designed sensor contains two symmetrical sample cells surrounding a cavity in a circular photonic crystal. The transmission properties of the terahertz wave sensor are analyzed based on COMSOL Multiphysics when the central sample cells are filled with analyte with different refractive indices. The sensor characteristics depending on the structure parameters are analyzed. The choice of these parameters is discussed. Finally, a sensitivity of 10.4 μm/RIU, Q-factor of 62.21, and figure-of-merit of 1.46 are realized. The results in this work are expected to be able to extend the circular photonic crystal-based sensor to terahertz wave region. Keywords:treahertz wave/ refractive index sensor/ circular photonic crystal/ high sensitivity
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2.模型和理论研究图1给出本文所设计的基于向日葵型圆形光子晶体太赫兹传感器结构图. 在o-xy平面上的散射体(HDPE基板中的气孔)的空间晶格位置由下面公式描述[29]: 图 1 圆形光子晶体太赫兹波传感器 (a)二维结构; (b)三维结构 Figure1. (a) 2D structure of the terahertz wave sensor based on the circular photonic crystal; (b) 3D structure of the sensor.