Observation of the exceptional-point-enhanced Sagnac effect.

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ID: 69679
2019
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Abstract
Exceptional points (EPs) are special spectral degeneracies of non-Hermitian Hamiltonians that govern the dynamics of open systems. At an EP, two or more eigenvalues, and the corresponding eigenstates, coalesce. Recently, it was predicted that operation of an optical gyroscope near an EP results in improved response to rotations. However, the performance of such a system has not been examined experimentally. Here we introduce a precisely controllable physical system for the study of non-Hermitian physics and nonlinear optics in high-quality-factor microresonators. Because this system dissipatively couples counter-propagating lightwaves within the resonator, it also functions as a sensitive gyroscope for the measurement of rotations. We use our system to investigate the predicted EP-enhanced Sagnac effect and observe a four-fold increase in the Sagnac scale factor by directly measuring rotations applied to the resonator. The level of enhancement can be controlled by adjusting the system bias relative to the EP, and modelling results confirm the observed enhancement. Moreover, we characterize the sensitivity of the gyroscope near the EP. Besides verifying EP physics, this work is important for the understanding of optical gyroscopes.
Reference Key
lai2019observationnature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lai, Yu-Hung;Lu, Yu-Kun;Suh, Myoung-Gyun;Yuan, Zhiquan;Vahala, Kerry;
Journal Nature
Year 2019
DOI
10.1038/s41586-019-1777-z
URL
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