Ultrasensitive measurement of gas refractive index using an optical nanofiber coupler

被引：68

作者：

Li, Kaiwei ^{[1
]}

Zhang, Nan ^{[1
,2
]}

Zhang, Nancy Meng Ying ^{[1
,2
]}

Liu, Guigen ^{[3
]}

Zhang, Ting ^{[1
]}

Wei, Lei ^{[1
,2
]}

机构：

[1] Nanyang Technol Univ, Sch Elect & Elect Engn, 50 Nanyang Ave, Singapore 639798, Singapore

[2] Nanyang Technol Univ, THALES, CNRS, CINTRA,UMI3288, Res Techno Plaza,50 Nanyang Dr, Singapore 637553, Singapore

[3] Univ Nebraska, Dept Elect & Comp Engn, Lincoln, NE 68588 USA

来源：

OPTICS LETTERS | 2018年 / 43卷 / 04期

关键词：

FABRY-PEROT-INTERFEROMETER; PHOTONIC CRYSTAL FIBER; AIR;

D O I：

10.1364/OL.43.000679

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report an ultrasensitive gas refractive index (RI) sensor based on optical nanofiber couplers (ONCs). Theoretical analysis reveals that a dispersion turning point (DTP) exists when the diameter of the coupler is below 1000 nm. Leveraging this DTP, the gas RI sensitivity can be significantly improved to infinity. Then we experimentally demonstrate a DTP and achieve ultrahigh sensitivities of 46,470 nm/refractive index unit (RIU) and -45,550 nm/RIU around the DTP using an ONC with a diameter of 700 nm. More importantly, the unique twin dips/peaks interference characteristics around the DTP offers further enhancement on the sensitivity to 92,020 nm/RIU. The demonstrated sensor not only shows vast potential in ultrasensitive pressure sensing, acoustic sensing, gas sensing, and gas phase biomarker detection, but also provides a new tool for nonlinear optics, ultrafast optics, quantum optics, and ultracold atom optics. (C) 2018 Optical Society of America

引用

页码：679 / 682

页数：4

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