Non-resonant exceptional points as enablers of noise-resilient sensors
Non-resonant exceptional points as enablers of noise-resilient sensors
复制标题
非谐振异常点作为抗噪声传感器的推动者
DOI：
10.1038/s42005-022-00973-5
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发表时间：
2022
影响因子：
5.5
通讯作者：
Kottos, Tsampikos
中科院分区：
文献类型：
--
作者：
Tuxbury, William;Kononchuk, Rodion;Kottos, Tsampikos
最近，由于微扰与传感器相互作用时共振分裂的次线性响应，非厄米系统主谐振谱中的例外点简并(EPD)被用于传感。次线性响应对小扰动和大动态范围具有很高的灵敏度。然而，基于谐振式的EPD传感遵守由谐振品质因数和由增益元件引起的信噪比降低所施加的分辨率限制。此外，它容易受到局部机械干扰和缺陷的影响。在这里，我们提出了一种被动非共振(NR)EPD传感器，它对损耗、局部空腔变化和噪声具有弹性。这种结合使得能够以次线性响应将横截面尖点分散到远离NR-EPD的小失谐位置。我们表明，这些尖点可以用于增强的抗噪感知。
Exceptional point degeneracies (EPDs) in the resonant spectrum of non-Hermitian systems have been recently employed for sensing due to the sublinear response of the resonance splitting when a perturbant interacts with the sensor. The sublinear response provides high sensitivity to small perturbations and a large dynamic range. However, the resonant-based EPD sensing abides to the resolution limit imposed by the resonant quality factors and by the signal-to-noise ratio reduction due to gain-elements. Moreover, it is susceptible to local mechanical disturbances and imperfections. Here, we propose a passive non-resonant (NR) EPD-sensor that is resilient to losses, local cavity variations, and noise. The NR-EPD describes the coalescence of Bloch eigenmodes associated with the spectrum of transfer matrices of periodic structures. This coalescence enables scattering cross-section cusps with a sublinear response to small detunings away from an NR-EPD. We show that these cusps can be utilized for enhanced noise-resilient sensing.
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影响因子：
13.6
作者：
Kononchuk R;Feinberg J;Knee J;Kottos T
通讯作者：
Kottos T
影响因子：
64.8
作者：
Chen, Weijian;Ozdemir, Sahin Kaya;Yang, Lan
通讯作者：
Yang, Lan
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作者：
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通讯作者：
Rotter, Stefan
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作者：
Chen, Pai-Yen;Sakhdari, Maryam;Alu, Andrea
通讯作者：
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