A portable LED-based diamond magnetometer for outreach and teaching labs
Hollis Williams, Alex Newman, Stuart Graham, Colin Stephen, and Gavin Morley
TL;DR
This paper introduces a low-cost, portable diamond magnetometer using an LED instead of a laser, making it safer and more accessible for educational and outreach purposes.
Contribution
It presents a simplified, affordable NV center diamond magnetometer design suitable for teaching labs and outreach, with demonstrated magnetic sensing capabilities.
Findings
Produces ODMR spectra reliably
Responds to nearby magnetic objects
Sensitivity around 1 μT/√Hz
Abstract
We present a compact, low-cost version of an NV center diamond magnetometer which replaces the standard green laser with a high-power LED. This modification improves safety, reduces cost, and allows the green excitation and red photoluminescence to be viewed directly during demonstrations. The device is simple to assemble and suitable for outreach activities and undergraduate laboratories. We show that it can produce ODMR spectra and respond to nearby magnetic objects, with a sensitivity on the order of 1 T/. Supplementary material provides details of the construction and suggestions for student investigations to support use in teaching laboratories.
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Taxonomy
TopicsDiamond and Carbon-based Materials Research · Experimental and Theoretical Physics Studies · Geophysics and Sensor Technology