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Polymer encapsulated microcavity optomechanical magnetometer.

Jiangang Zhu1, Guangming Zhao2, Igor Savukov3

  • 1Los Alamos National Lab, Los Alamos, NM, 87544, USA. jzhu@lanl.gov.

Scientific Reports
|August 23, 2017
PubMed
Summary
This summary is machine-generated.

This study presents a novel micro-magnetometer. It uses a polymer-encapsulated microcavity to detect magnetic fields with high sensitivity, offering a robust and practical sensor solution.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Whispering-gallery-mode (WGM) microcavities are sensitive optical resonators.
  • Developing micro-scale magnetometers with high sensitivity and robustness is crucial for various applications.

Purpose of the Study:

  • To demonstrate a novel magnetometer based on a polymer-encapsulated WGM microcavity actuated by a micro-magnet.
  • To characterize the performance of this micro-magnetometer in terms of sensitivity and frequency range.

Main Methods:

  • Fabrication of a WGM microcavity encapsulated in a polymer matrix with an integrated micro-magnet.
  • Utilizing the magnetic field-induced deformation of the polymer to alter the microcavity's refractive index.
  • Optical detection of the refractive index change to measure the magnetic field.

Main Results:

  • The developed magnetometer operates in the hertz-to-kilohertz frequency range.
  • Achieved a magnetic field sensitivity of 880 pT/Hz1/2 at 200 Hz.
  • Demonstrated environmental robustness and practicality due to polymer encapsulation and fiber optical connection.

Conclusions:

  • The polymer-encapsulated WGM microcavity magnetometer is a promising technology for sensitive magnetic field detection.
  • The micro-scale sensor volume and robust design open possibilities for diverse applications.
  • This approach offers a practical and sensitive method for micro-scale magnetic field sensing.