Ultra-compact on-chip slot Bragg grating structure for small electric field detection

作     者：WENTAO QIU HUIHUI LU FADI ISSAM BAIDA MARIA-PILAR BERNAL 

作者机构：Guangdong Provincial Key Laboratory of Optical Fiber Sensing and CommunicationsDepartment of Optoelectronic EngineeringJinan University Département d'Optique P.M.DuffieuxInstitut FEMTO-STUMR 6174 CNRS Université Bourgogne Franche-Comté 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2017年第5卷第3期

页      面：212-218页

核心收录：

学科分类：0808[工学-电气工程] 070207[理学-光学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China(NSFC)(61405075) Natural Science Foundation of Guangdong Province(2015A030306046) 

主　　题：of nm FDTD in PBG for 

摘      要：In this paper, we present an ultra-compact 1D photonic crystal(Ph C) Bragg grating design on a thin film lithium niobate slot waveguide(SWG) via 2D-and 3D-FDTD simulations. 2D-FDTD simulations are employed to tune the photonic bandgap(PBG) size, PBG center, cavity resonance wavelength, and the whole size of Ph C. 3DFDTD simulations are carried out to model the real structure by varying different geometrical parameters such as SWG height and Ph C size. A moderate resonance quality factor Q of about 300 is achieved with a Ph C size of only 0.5 μm× 0.7 μm× 6 μm. The proposed slot Bragg grating structure is then exploited as an electric field(E-field) sensor. The sensitivity is analyzed by 3D-FDTD simulations with a minimum detectable E-field as small as 23 m V∕m. The possible fabrication process of the proposed structure is also discussed. The compact size of the proposed slot Bragg grating structure may have applications in on-chip E-field sensing, optical filtering, etc.