Two-way enhancement of sensitivity by tailoring higher-order exceptional points

• URL: http://arxiv.org/abs/2202.07972v2
• Date: Mon, 8 Aug 2022 22:14:48 GMT
• Title: Two-way enhancement of sensitivity by tailoring higher-order exceptional points
• Abstract summary: Higher-order exceptional points in non-Hermitian systems have recently been used as a tool to engineer high-sensitivity devices. We present a simple yet effective scheme to enhance the device sensitivity by slightly deviating the gain-neutral-loss linear configuration to a triangular one. Our analysis demonstrates that the exceptional points can be tailored by a judicious tuning of the coupling parameters of the system.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Higher-order exceptional points in non-Hermitian systems have recently been used as a tool to engineer high-sensitivity devices, attracting tremendous attention from multidisciplinary fields. Here, we present a simple yet effective scheme to enhance the device sensitivity by slightly deviating the gain-neutral-loss linear configuration to a triangular one, resulting in an abrupt phase transition from third-order to second-order exceptional points. Our analysis demonstrates that the exceptional points can be tailored by a judicious tuning of the coupling parameters of the system, resulting in enhanced sensitivity to a small perturbation. The tunable coupling also leads to a sharp change in the sensitivity slope, enabling the perturbation to be measured precisely as a function of coupling. This two-way detection of the perturbation opens up a rich landscape toward ultra-sensitive measurements, which could be applicable to a wide range of non-Hermitian ternary platforms.

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