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Signal reception of nuclear magnetic resonance (NMR) usually relies onelectrical amplification of the electromotive force caused by nuclearinduction. Here, we report up-conversion of a radio-frequency NMR signal to anoptical regime using a high-stress silicon nitride membrane that interfaces theelectrical detection circuit and an optical cavity through theelectro-mechanical and the opto-mechanical couplings. This enables optical NMRdetection without sacrificing the versatility of the traditional nuclearinduction approach. While the signal-to-noise ratio is currently limited by theBrownian motion of the membrane as well as additional technical noise, we findit can exceed that of the conventional electrical schemes by increasing theelectro-mechanical coupling strength. The electro-mechano-optical NMR detectionpresented here opens the possibility of mechanical parametric amplification ofNMR signals. Moreover, it can potentially be combined with the laser coolingtechnique applied to nuclear spins.

Electro-mechano-optical detection of nuclear magnetic resonance