Enhancing the Sensitivity of Frequency and Energy Splitting Detection by Using Exceptional Points: Application to Microcavity Sensors for Single-Particle Detection
Enhancing the Sensitivity of Frequency and Energy Splitting Detection by Using Exceptional Points: Application to Microcavity Sensors for Single-Particle Detection
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DOI：
10.1103/physrevlett.112.203901
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发表时间：
2014-05-20
影响因子：
8.6
通讯作者：
Wiersig, Jan
中科院分区：
文献类型：
--
作者：
Wiersig, Jan
物理学中使用的几种类型的传感器是基于谐振频率或能级分裂的检测。我们建议在这里操作这样的传感器在所谓的例外点，这是简并在开放的波和量子系统中，至少有两个谐振频率或能级和相应的本征态合并。我们认为，这有很大的潜力，提高灵敏度提供一个是能够测量的频率分裂以及线宽分裂。我们将这一概念应用于单粒子检测的微腔传感器。分析理论和数值模拟证明了超过三倍的灵敏度增强。我们讨论了使用有源光学微腔解决单个线宽的可能性。
Several types of sensors used in physics are based on the detection of splittings of resonant frequencies or energy levels. We propose here to operate such sensors at so-called exceptional points, which are degeneracies in open wave and quantum systems where at least two resonant frequencies or energy levels and the corresponding eigenstates coalesce. We argue that this has great potential for enhanced sensitivity provided that one is able to measure both the frequency splitting as well as the linewidth splitting. We apply this concept to a microcavity sensor for single-particle detection. An analytical theory and numerical simulations prove a more than threefold enhanced sensitivity. We discuss the possibility to resolve individual linewidths using active optical microcavities.