Radiofrequency NMR signals can be upconverted to an optical regime using a nanomembrane transducer, where a mechanical oscillator made of a silicon nitride membrane plays a major role, bridging electrical and optical systems. In this what we call Electro-Mechano-Optical (EMO) NMR approach, an electrode and a mirror are built on the membrane, so that the former works as a capacitor of the probe circuit, while the latter serves for one of the mirrors of an optical cavity. Here, we report our recent works on EMO NMR and related topics, including the first proof-of-principle demonstration, fabrication of the EMO transducer module, and application to \(^{1}\) H- \(^{13}\) C double resonance experiments. Even though EMO NMR has witnessed remarkable progress in terms of sensitivity, applicability, and stability in the latest reports, it has yet to outperform the conventional, electrically detected NMR at the moment of writing this chapter. In principle, the sensitivity of EMO NMR can become better to such an extent that corresponds to using an ideal preamplifier with noise figure of 0 dB in the conventional scheme. A number of technical issues need to be overcome to improve the electro-mechanical coupling strength.