Magnetic field sensing using whispering-gallery modes in a cylindrical microresonator infiltrated with ferronematic liquid crystal

被引：35
作者：
Mahmood, Aseel [1 ,2 ]
Kavungal, Vishnu [1 ]
Ahmed, Sudad S. [2 ]
Kopcansky, Peter [3 ]
Zavisova, Vlasta [3 ]
Farrell, Gerald [1 ]
Semenova, Yuliya [1 ]
机构：
[1] Dublin Inst Technol, Photon Res Ctr, Kevin St, Dublin 8, Ireland
[2] Baghdad Univ, Coll Sci, Dept Phys, Baghdad, Iraq
[3] Inst Expt Phys SAS, Watsonova 47, Kosice 04001, Slovakia
来源：
OPTICS EXPRESS | 2017年 / 25卷 / 11期
关键词：
OPTICAL RESONATORS; SENSITIVITY;
D O I：
10.1364/OE.25.012195
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
An all-fiber magnetic field sensor based on whispering-gallery modes (WGM) in a fiber micro-resonator infiltrated with ferronematic liquid crystal is proposed and experimentally demonstrated. The cylindrical microresonator is formed by a 1 cm-long section of a photonic crystal fiber infiltrated with ferronematic materials. Both ferronematics suspensions are prepared based on the nematic liquid crystal 1-(trans-4-Hexylcyclohexyl)-4-isothiocyanatobenzene (6CHBT) doped with rod-like magnetic particles in the first case and with spherical magnetic particles in the second case. WGMs are excited in the fiber microresonator by evanescent light coupling using a tapered fiber with a micron-size diameter. The Q-factor of the microresonator determined from the experimentaly measured transmission spectrum of the tapered fiber was 1.975 x 10(3). Under the influence of an applied magnetic field the WGM resonances experience spectral shift towards shorter wavelengths. The experimentally demonstrated sensitivity of the proposed sensor was -39.6 pm/mT and -37.3 pm/mT for samples infiltrated with rod like and spherical like ferromagnetic suspensions respectively for a magnetic field range (0-47) mT. Reducing the diameter of the cylindrical micro-resonator by tapering leads to enhancement of the magnetic field sensitivity up to -61.86 pm/mT and -49.88 pm/mT for samples infiltrated with rod like and spherical like ferromagnetic suspensions respectively for the magnetic field range (0-44.7) mT. (C) 2017 Optical Society of America
引用
收藏
页码：12195 / 12202
页数：8
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