Chin-scale high Q-factor glassblown microspherical shells for magnetic sensnig

被引：14

作者：

Freeman, Eugene ^{[1
]}

Wang, Cheng-Yu ^{[2
]}

Sumaria, Vedant ^{[3
]}

Schiff, Steven J. ^{[4
,5
,6
]}

Liu, Zhiwen ^{[2
]}

Tadigadapa, Srinivas ^{[3
]}

机构：

[1] Aerosp Adv Technol, Honeywell Int, Plymouth, MN 55441 USA

[2] Penn State Univ, Sch Elect Engn & Comp Sci, University Pk, PA 16802 USA

[3] Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA

[4] Penn State Univ, Dept Engn Sci & Mech, Ctr Neural Engn, 227 Hammond Bldg, University Pk, PA 16802 USA

[5] Penn State Univ, Dept Neurosurg, University Pk, PA 16802 USA

[6] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

来源：

AIP ADVANCES | 2018年 / 8卷 / 06期

基金：

美国国家卫生研究院; 美国国家科学基金会;

关键词：

RESONATORS;

D O I：

10.1063/1.5030460

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A whispering gallery mode resonator based magnetometer using chip-scale glass microspherical shells is described. A neodynium micro-magnet is elastically coupled and integrated on top of the microspherical shell structure that enables transduction of the magnetic force experienced by the magnet in external magnetic fields into an optical resonance frequency shift. High quality factor optical microspherical shell resonators with ultra-smooth surfaces have been successfully fabricated and integrated with magnets to achieve Q-factors of greater than 1.1 x 10(7) and have shown a resonance shift of 1.43 GHz/mT (or 4.0 pm/mT) at 760 nm wavelength. The main mode of action is mechanical deformation of the microbubble with a minor contribution from the photoelastic effect. An experimental limit of detection of 60 nT Hz(-1/2) at 100 Hz is demonstrated. A theoretical thermorefractive limited detection limit of 52 pT Hz(-1/2) at 100 Hz is calculated from the experimentally derived sensitivity. The paper describes the mode of action, sensitivity and limit of detection is evaluated for the chip-scale whispering gallery mode magnetometer. (C) 2018 Author(s).

引用

页数：8

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