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Parity-time symmetry breaking in coupled nanobeam cavities
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 24487Article in journal (Refereed) PublishedText
Abstract [en]

The concept of parity-time symmetry (PT symmetry) originates from the canonical quantum mechanics and has become a hot topic recently. As a versatile platform to investigate the intriguing concept, both theoretical and experimental works in optics have been implemented. In this paper, the PT symmetry breaking phenomenon is investigated in a coupled nanobeam cavity system. An exceptional point is observed during the tuning of the gain/loss level and the coupling strength of the closely placed nanobeam pair. Unidirectional light propagation is investigated, as well as enhanced sensitivity of single particle detection in the vicinity of the exceptional point. The proposed system is easy to be integrated with photonic integrated circuits and can be strongly coupled to optical waveguides.

Place, publisher, year, edition, pages
Nature Publishing Group, 2016. Vol. 6, 24487
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URN: urn:nbn:se:kth:diva-187071DOI: 10.1038/srep24487ISI: 000374040800003PubMedID: 27075817ScopusID: 2-s2.0-84963812136OAI: oai:DiVA.org:kth-187071DiVA: diva2:929200
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QC 20160518

Available from: 2016-05-18 Created: 2016-05-17 Last updated: 2016-05-18Bibliographically approved

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He, Sailing
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