利用光子相关性的折射率传感量子等离子体模型
Quantum plasmonics model of refractive index sensing using photon correlations
AI总结：
本文提出一种由量子发射体和金属纳米颗粒组成的纳米传感器系统，利用高阶光子相关性进行折射率传感，发现在特定条件下可将噪声降至散粒噪声极限以下，实现传感性能的量子增强。
摘要：
量子发射体与金属纳米颗粒电偶极矩之间的相互作用产生了独特的光学性质，例如干涉诱导的光子相关性，这可能对基于强度的增强型传感很有用。利用光探测的量子理论，我们提出了一个由量子发射体和金属纳米颗粒组成的纳米传感器系统，探索了利用高阶光子相关性进行折射率传感的可能性。预测了该纳米传感器的折射率灵敏度和分辨率，其散射光谱位于可见光区域。该传感器由基底支撑，并由相干场弱驱动。通过计算系统散射场产生的平均光子计数及其第二阶阶乘矩，在最佳驱动波长下比较了强度和强度-强度相关性的传感性能。发现平均光子计数本质上很低，抑制了干涉诱导的光子反聚束在最小化传感器强度散粒噪声中的作用。然而，确定了一个可将噪声降低至散粒噪声极限以下的区域，从而在传感性能上实现量子增强。
英文摘要：
The interaction between the electric dipole moments of a quantum emitter and a metal nanoparticle gives rise to unique optical properties, such as interference-induced photon correlations, that could be useful for enhanced intensity-based sensing. Using the quantum theory of photodetection, we propose a nanosensor system comprising a quantum emitter and a metal nanoparticle that explores the possibility of utilizing higher-order photon correlations for refractive index sensing. Both the refractive index sensitivity and resolution of the nanosensor, whose scattering spectrum lies within the visible region, are predicted. The sensor is supported by a substrate and driven weakly by a coherent field. By calculating the mean photocount and its second factorial moment resulting from the scattered field of the system, the sensing performance of the intensity and intensity-intensity correlation, are compared at optimal driving wavelengths. The mean photocount was found to be inherently low, inhibiting the role of interference-induced photon antibunching in minimizing the sensor's intensity shot noise. However, a regime in which the noise could be reduced below the shot noise limit is identified, leading to a quantum enhancement in the sensing performance.
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