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Chip-scale high Q-factor glassblown microspherical shells for magnetic sensing
Eugene Freeman1, Cheng-Yu Wang2, Vedant Sumaria3
1Honeywell International, Aerospace Advanced Technology, Plymouth, MN 55441, USA.
AIP Advances
|June 26, 2018
Summary
This study presents a chip-scale magnetometer utilizing whispering gallery mode resonators. The device achieves high sensitivity for magnetic field detection using a micro-magnet integrated with a glass microspherical shell.
Area of Science:
- Optics
- Nanotechnology
- Physics
Background:
- Whispering gallery mode (WGM) resonators offer high sensitivity for sensing applications.
- Miniaturized magnetometers are crucial for various scientific and technological fields.
- Integrating optical resonators with magnetic elements enables novel transduction mechanisms.
Purpose of the Study:
- To develop and characterize a chip-scale magnetometer based on whispering gallery mode resonators.
- To investigate the transduction of magnetic forces into optical resonance frequency shifts.
- To evaluate the sensitivity and limit of detection of the proposed magnetometer.
Main Methods:
- Fabrication of high quality factor (Q > 1.1 × 10^7) glass microspherical shell resonators.
- Elastic coupling and integration of a neodymium micro-magnet onto the resonator.
- Measurement of optical resonance frequency shift in response to external magnetic fields.
- Analysis of mechanical deformation and photoelastic effects for transduction.
Main Results:
- Demonstrated a sensitivity of 1.43 GHz/mT (4.0 pm/mT) at 760 nm wavelength.
- Achieved an experimental limit of detection of 60 nT Hz^-1/2 at 100 Hz.
- Calculated a theoretical thermorefractive limited detection limit of 52 pT Hz^-1/2 at 100 Hz.
Conclusions:
- The chip-scale whispering gallery mode resonator magnetometer exhibits promising performance for sensitive magnetic field measurements.
- The primary transduction mechanism is the mechanical deformation of the microbubble resonator.
- The device shows potential for further miniaturization and integration in various sensing platforms.
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