AI Article Synopsis
- Exceptional points (EPs) can significantly improve the sensitivity of optical sensors, and higher-order EP systems offer even greater enhancements.
- This study focuses on high-order non-Hermitian systems and presents a design guideline for creating sensors with increased response order.
- The proposed optical sensor demonstrates a fourth-order response at a high-order EP, resulting in over 100 times more sensitivity compared to traditional single resonator sensors under minor changes.
Article Abstract
Exceptional points (EPs) could potentially enhance the sensitivity of an optical sensing system by orders of magnitude. Higher-order EP systems, having more complex physics, can further boost this parameter. In this paper, we investigate the response order of high-order non-Hermitian systems and provide a guideline for designing a sensor with high response order. Based on this design rule, we propose and demonstrate an optical sensor with a fourth-order response, and analyze its associated properties. The four resonant wavelengths of our optical sensor simultaneously collapse at a high-order exceptional point in the parameter space, providing a fourth root relation between the amount of wavelength splitting and the amplitude of the perturbation. A large sensitivity enhancement factor over 100, is observed when the wavelength splitting is compared with traditional single resonator-based sensors under small perturbation conditions.
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| http://dx.doi.org/10.1364/OE.418644 | DOI Listing |
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