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Quantum-enhanced plasmonic sensing
Optica ( IF 10.4 ) Pub Date : 2018-05-16 , DOI: 10.1364/optica.5.000628
Mohammadjavad Dowran , Ashok Kumar , Benjamin J. Lawrie , Raphael C. Pooser , Alberto M. Marino

Quantum resources can enhance the sensitivity of a device beyond the classical shot noise limit and, as a result, revolutionize the field of metrology through the development of quantum-enhanced sensors. In particular, plasmonic sensors, which are widely used in biological and chemical sensing applications, offer a unique opportunity to bring such an enhancement to real-life devices. Here, we use bright entangled twin beams to enhance the sensitivity of a plasmonic sensor used to measure local changes in the refractive index. We demonstrate a 56% quantum enhancement in the sensitivity of a state-of-the-art plasmonic sensor when compared with the corresponding classical configuration and a 24% quantum enhancement when compared to an optimal single-beam classical configuration. We measure sensitivities on the order of 1010 RIU/Hz, nearly 5 orders of magnitude better than previous proof-of-principle implementations of quantum-enhanced plasmonic sensors. These results promise significant enhancements in ultratrace label-free plasmonic sensing and will find their way into areas ranging from biomedical applications to chemical detection.

中文翻译:

量子增强等离子体感测

量子资源可以提高设备的灵敏度,使其超出经典的散粒噪声限制,从而通过开发量子增强型传感器来革新计量领域。特别是,广泛用于生物和化学传感应用中的等离激元传感器为将这种增强功能应用于现实生活中的设备提供了独特的机会。在这里,我们使用明亮的纠缠双光束来增强用于测量折射率局部变化的等离激元传感器的灵敏度。与相应的经典配置相比,我们证明了最新等离子传感器的灵敏度提高了56%,与最佳单束经典配置相比,提高了24%。我们按以下顺序测量灵敏度:10-10 IU/赫兹,比以前的量子增强型等离激元传感器的原理证明实现要好近5个数量级。这些结果有望大大增强超痕量无标记等离激元传感,并将进入生物医学应用到化学检测等领域。
更新日期:2018-05-18
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