High-sensitivity magnetic sensor based on the evanescent scattering by a magnetorheological film

被引：8

作者：

Li, Binghui ^{[1
]}

Chan, Hau Ping ^{[1
]}

Ahmmed, Kazi Tanvir ^{[1
,2
]}

He, Liangjun ^{[1
]}

Zhu, Shuyan ^{[1
]}

Wu, Qiang ^{[3
]}

机构：

[1] City Univ Hong Kong, Dept Elect Engn, Kowloon Tong, 83 Tat Chee Ave, Hong Kong, Peoples R China

[2] Univ Chittagong, Dept Elect & Elect Engn, Chittagong 4331, Bangladesh

[3] Northumbria Univ, Dept Math Phys & Elect Engn, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England

来源：

OPTICS LETTERS | 2020年 / 45卷 / 24期

关键词：

FIELD SENSOR;

D O I：

10.1364/OL.411542

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present a simple concept to implement a magnetic sensor that uses evanescent scattering by a suspended magnetorheological (MR) film above a planar waveguide. The soft MR film embedded with ferromagnetic particles is to induce scattering on the evanescent field of a planar waveguide at a proximity distance. This distance can be controlled precisely by a magnetic field. Consequently, the waveguide output power changes in response to the magnetic intensity. Two sensor prototypes of different film thicknesses were designed and tested showing a trade-off between the sensitivity and dynamic sensing range. A maximum sensitivity of similar to 2.62 dB/mT was obtained. Compared to optical micro-electromechanical systems, the presented sensors feature a simple design, easy fabrication, low cost, and the potential for large-scale production and miniaturization to be integrated into portable devices. (C) 2020 Optical Society of America

引用

页码：6643 / 6646

页数：4

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