Issue |
EPL
Volume 137, Number 1, January 2022
|
|
---|---|---|
Article Number | 10001 | |
Number of page(s) | 6 | |
Section | General physics | |
DOI | https://doi.org/10.1209/0295-5075/ac483c | |
Published online | 05 April 2022 |
Fourth-order exceptional points with spinning resonators
1 Department of Electrical Engineering and Computer Sciences, University of California - Berkeley, CA 94720, USA
2 School of Microelectronics, Beihang University - Beijing 100191, China
3 Research Institute of Frontier Science, Beihang University - Beijing 100191, China
4 Beijing Academy of Quantum Information Sciences - Beijing 100193, China
(a) qinhaoye@gmail.com (corresponding author)
(b) mingding@buaa.edu.cn
Received: 5 October 2021
Accepted: 5 January 2022
Investigation of exceptional points mostly focuses on the second-order case and employs the gain-involved parity-time (PT) symmetric systems. Here, we propose an approach to implementing fourth-order exceptional points (FOEPs) using directly coupled optical resonators with rotation. On resonance, the system manifests FOEP through tuning the spinning velocity to targeted values. Eigenfrequency bifurcation and enhanced sensitivity for nanoparticle have been presented. Also, near FOEP, nonreciprocal light propagation exhibits great boost and dramatic change, which may be applied to high-efficiency isolators and circulators.
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