Fluctuations and noise-limited sensing near the exceptional point of PT symmetric resonator systems

N. Asger Mortensen, P. A. D. Gonçalves, Mercedeh Khajavikhan, Demetrios N. Christodoulides, C. Tserkezis, Christian Wolff

Research output: Contribution to journalArticlepeer-review

Abstract

We theoretically explore the role of mesoscopic fluctuations and noise on the spectral and temporal properties of systems of PT-symmetric coupled gain-loss resonators operating near the exceptional point, where eigenvalues and eigenvectors coalesce. We show that the inevitable detuning in the frequencies of the uncoupled resonators leads to an unavoidable modification of the conditions for reaching the exceptional point, while, as this point is approached in ensembles of resonator pairs, statistical averaging significantly smears the spectral features. We also discuss how these fluctuations affect the sensitivity of sensors based on coupled PT-symmetric resonators. Finally, we show that temporal fluctuations in the detuning and gain of these sensors lead to a quadratic growth of the optical power in time, thus implying that maintaining operation at the exceptional point over a long period can be rather challenging. Our theoretical analysis clarifies issues central to the realization of PT-symmetric devices, and should facilitate future experimental work in the field.
Original languageEnglish
Pages (from-to)1342-1346
JournalOptica
Volume5
Issue number10
Publication statusPublished - 18 Oct 2018

Bibliographical note

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Funding: MSCA-COFUND-MULTIPLY - Grant number 713694 - H2020.

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