Diamagnetically levitating resonant weighing scale
Xianfeng Chen (TU Delft - Dynamics of Micro and Nano Systems)
Nimit Kothari (Student TU Delft)
Ata Keşkekler (TU Delft - Dynamics of Micro and Nano Systems)
Peter G. Steeneken (TU Delft - Dynamics of Micro and Nano Systems, TU Delft - QN/Steeneken Lab, Kavli institute of nanoscience Delft)
Farbod Alijani (TU Delft - Dynamics of Micro and Nano Systems)
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Abstract
Diamagnetic levitation offers stable confinement of an object from its environment at zero power, and thus is a promising technique for developing next generation unclamped resonant sensors. In this work, we realize a resonant weighing scale using a graphite plate that is diamagnetically levitating over a checkerboard arrangement of permanent magnets. We characterize the bending vibrations of the levitating object using laser Doppler vibrometry and use microgram glass beads to calibrate the responsivity of the sensor's resonance frequency to mass changes. The sensor is used for real-time measurement of the evaporation rate of nano-litre droplets with high-accuracy. By analyzing the resonator's frequency stability, we show that the millimeter graphite sensor can reach mass resolutions down to 4.0 ng, relevant to biological and chemical sensing concepts.
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