核磁共振的机电光探测
Electro-mechano-optical detection of nuclear magnetic resonance
摘要：
核磁共振（NMR）的信号接收通常依赖于由核感应引起的电动势的电放大。在这里，我们报告上转换的射频NMR信号的光学制度，使用高应力氮化硅膜，接口的电气检测电路和光学腔通过机电和光机械耦合。这使得光学NMR检测，而不牺牲传统的核感应方法的多功能性。虽然信噪比目前受到膜的布朗运动以及附加技术噪声的限制，但我们发现通过增加机电耦合强度，它可以超过传统的电方案。本文提出的机电光核磁共振检测方法为核磁共振信号的机械参量放大提供了可能性。此外，它可以潜在地与应用于核自旋的激光冷却技术相结合。
英文摘要：
Signal reception of nuclear magnetic resonance (NMR) usually relies on electrical amplification of the electromotive force caused by nuclear induction. Here, we report up-conversion of a radio-frequency NMR signal to an optical regime using a high-stress silicon nitride membrane that interfaces the electrical detection circuit and an optical cavity through the electro-mechanical and the opto-mechanical couplings. This enables optical NMR detection without sacrificing the versatility of the traditional nuclear induction approach. While the signal-to-noise ratio is currently limited by the Brownian motion of the membrane as well as additional technical noise, we find it can exceed that of the conventional electrical schemes by increasing the electro-mechanical coupling strength. The electro-mechano-optical NMR detection presented here opens the possibility of mechanical parametric amplification of NMR signals. Moreover, it can potentially be combined with the laser cooling technique applied to nuclear spins.
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