We demonstrate an optical magnetometer based on a microfabricated 87Rb vapor cell in a micromachined silicon sensor head. The alkali atom density in the vapor cell is increased by heating the cell with light brought to the sensor through an optical fiber, and absorbed by colored filters attached to the cell windows. A second fiber-optically coupled beam optically pumps and interrogates the atoms. The magnetometer operates on 140 mW of heating power and achieves a sensitivity below 20 fT/√Hz throughout most of the frequency band from 15 Hz to 100 Hz. Such a sensor can measure magnetic fields from the human heart and brain.
Skip Nav Destination
Research Article| December 11 2012
A low-power, high-sensitivity micromachined optical magnetometer
R. Mhaskar, S. Knappe, J. Kitching; A low-power, high-sensitivity micromachined optical magnetometer. Appl. Phys. Lett. 10 December 2012; 101 (24): 241105. https://doi.org/10.1063/1.4770361
Download citation file:
Don't already have an account? Register
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Could not validate captcha. Please try again.