Ultrabroadband and sensitive cavity optomechanical magnetometry

作     者：Bei-Bei Li George Brawley Hamish Greenall Stefan Forstner Eoin Sheridan Halina Rubinsztein-Dunlop Warwick P.Bowen 

作者机构：Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Mathematics and PhysicsThe University of QueenslandSt LuciaQLD 4072Australia 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2020年第8卷第7期

页      面：1064-1071页

核心收录：

学科分类：0808[工学-电气工程] 080802[工学-电力系统及其自动化] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Defense Advanced Research Projects Agency(Qu ASAR Program) Australian Research Council(DP140100734,FT140100650) Defence Science and Technology Group(CERA49,CERA50) University of Queensland(2014001447) 

主　　题：cavity magnetometer magneto 

摘      要：Magnetostrictive optomechanical cavities provide a new optical readout approach to room-temperature *** we report ultrasensitive and ultrahigh bandwidth cavity optomechanical magnetometers constructed by embedding a grain of the magnetostrictive material Terfenol-D within a high quality(Q)optical microcavity on a silicon *** engineering their physical structure,we achieve a peak sensitivity of26 p T∕Hz1/2 p comparable to the best cryogenic microscale magnetometers,along with a 3 d B bandwidth as high as 11.3 *** classes of magnetic response are observed,which we postulate arise from the crystallinity of the *** allows single crystalline and polycrystalline grains to be distinguished at the level of a single *** results may enable applications such as lab-on-chip nuclear magnetic spectroscopy and magnetic navigation.