Beyond Q: The Importance of the Resonance Amplitude for Photonic Sensors.
Beyond Q: The Importance of the Resonance Amplitude for Photonic Sensors.
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DOI：
10.1021/acsphotonics.2c00188
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发表时间：
2022-05-18
期刊：
影响因子：
7
通讯作者：
Martins, Emiliano R.
中科院分区：
文献类型：
--
作者：
Conteduca, Donato;Arruda, Guilherme S.;Barth, Isabel;Wang, Yue;Krauss, Thomas F.;Martins, Emiliano R.
关键词：
共振光子传感器正受到全球范围内对个性化医疗诊断和更好地监测环境的需要的广泛关注。最近开发的新概念，如超表面、连续体中的束缚态和拓扑传感，增加了对这一主题的兴趣。对越来越高的质量(Q)因素的驱动，加上对低成本的要求，使得理解现实限制（如光子传感器的损耗）的影响变得至关重要。传统上，假设q因子的降低足以说明损失的存在。在这里，我们强调这个假设过于简单，我们表明损耗对共振幅度的影响比对q因子的影响更大。我们注意到，在文献中共振幅度的影响在很大程度上被忽略了，并且没有物理模型清楚地描述检测限（LOD）、q因子和共振幅度之间的关系。因此，我们开发了一种新的从头算分析模型，在该模型中，我们推导出谐振光子传感器的完整优点图并确定其LOD。除了强调光学损耗和共振振幅的重要性外，我们还表明，与直觉相反，LOD的优化不是通过最大化q因子来实现的，而是通过平衡q因子和振幅来实现的。我们通过实验验证了该模型，并将其置于上下文中，并表明它对于在现实场景中应用新的传感概念至关重要。
Resonant photonic sensors are enjoying much attention based on the worldwide drive toward personalized healthcare diagnostics and the need to better monitor the environment. Recent developments exploiting novel concepts such as metasurfaces, bound states in the continuum, and topological sensing have added to the interest in this topic. The drive toward increasingly higher quality (Q)-factors, combined with the requirement for low costs, makes it critical to understand the impact of realistic limitations such as losses on photonic sensors. Traditionally, it is assumed that the reduction in the Q-factor sufficiently accounts for the presence of loss. Here, we highlight that this assumption is overly simplistic, and we show that losses have a stronger impact on the resonance amplitude than on the Q-factor. We note that the effect of the resonance amplitude has been largely ignored in the literature, and there is no physical model clearly describing the relationship between the limit of detection (LOD), Q-factor, and resonance amplitude. We have, therefore, developed a novel, ab initio analytical model, where we derive the complete figure of merit for resonant photonic sensors and determine their LOD. In addition to highlighting the importance of the optical losses and the resonance amplitude, we show that, counter-intuitively, optimization of the LOD is not achieved by maximization of the Q-factor but by counterbalancing the Q-factor and amplitude. We validate the model experimentally, put it into context, and show that it is essential for applying novel sensing concepts in realistic scenarios.
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