Tapered-optical fiber tip coupler for capillary whispering gallery mode

被引：0

作者：

Luo, Xinjian ^{[1
]}

Li, Hong ^{[1
]}

Wang, Wenjie ^{[1
]}

Song, Yanming ^{[2
]}

Zhu, Lianqing ^{[1
,2
,3
]}

机构：

[1] Beijing Informat Sci & Technol Univ, Minist Educ Optoelect Measurement Technol & Instr, Key Lab, Beijing, Peoples R China

[2] Beijing Informat Sci & Technol Univ, Beijing Lab Opt Fiber Sensing & Syst, Beijing, Peoples R China

[3] Guangzhou Nansha Intelligent Photon Sensing Res I, Guangzhou, Peoples R China

来源：

OPTICAL ENGINEERING | 2024年 / 63卷 / 02期

基金：

中国国家自然科学基金;

关键词：

fiber optics; whispering gallery mode; tapered-optical fiber tip; capillary; FANO RESONANCE; EXCITATION; RESONATORS;

D O I：

10.1117/1.OE.63.2.026103

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

. A tapered-optical fiber tip coupler for the excitation of capillary whispering gallery modes (WGMs) is proposed. The phase matching theory and spectral features are analyzed. The light transmission characteristics and cross-sectional mode fields of the coupler are simulated. The impact of fabrication tolerance on excited WGM is studied, and the structure is fabricated based on the simulation results. It has been experimentally verified that this structure can excite the WGM resonance of capillaries of various sizes, with the highest quality factor (Q factor) of 3.6x103 and refractive index sensitivity of 22.28nm/RIU. The resonant coupler is not fragile, large fabrication tolerance, and can excite WGM in capillaries of different sizes, which can provide a new means of detection in the field of capillary biochemical sensing.

引用

页数：9

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