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

被引:28
作者
Qiu, Wentao [1 ]
Lu, Huihui [1 ]
Baida, Fadi Issam [2 ]
Bernal, Maria-Pilar [2 ]
机构
[1] Jinan Univ, Dept Optoelect Engn, Guangdong Prov Key Lab Opt Fiber Sensing & Commun, Guangzhou, Guangdong, Peoples R China
[2] Univ Bourgogne Franche Comte, Dept Opt PM Duffieux, CNRS, Inst FEMTO ST,UMR 6174, 15B Ave Montboucons, F-25030 Besancon, France
基金
中国国家自然科学基金;
关键词
PHOTONIC CRYSTAL; LITHIUM-NIOBATE; WAVE-GUIDE; CONFINING LIGHT; THIN-FILM; RESONATORS; CAVITY;
D O I
10.1364/PRJ.5.000212
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In this paper, we present an ultra-compact 1D photonic crystal (PhC) 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 PhC. 3D-FDTD simulations are carried out to model the real structure by varying different geometrical parameters such as SWG height and PhC size. A moderate resonance quality factor Q of about 300 is achieved with a PhC size of only 0.5 mu m x 0.7 mu m x 6 mu m. 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 mV/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. (C) 2017 Chinese Laser Press
引用
收藏
页码:212 / 218
页数:7
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