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dc.contributor.authorCardea, Ivan
dc.contributor.authorGrassani, Davide
dc.contributor.authorFabbri, Simon
dc.contributor.authorUpham, Jeremy
dc.contributor.authorBoyd, Robert
dc.contributor.authorAltug, Hatice
dc.contributor.authorSchulz, Sebastian Andreas
dc.contributor.authorTsakmakidis, Kosmas
dc.contributor.authorBrès, Camille-Sophie
dc.identifier.citationCardea , I , Grassani , D , Fabbri , S , Upham , J , Boyd , R , Altug , H , Schulz , S A , Tsakmakidis , K & Brès , C-S 2020 , ' Arbitrarily high time bandwidth performance in a nonreciprocal optical resonator with broken time invariance ' , Scientific Reports , vol. 10 , 15752 .
dc.identifier.otherPURE: 270187979
dc.identifier.otherPURE UUID: 9dd8e15f-a2fd-4306-81d7-dc5fe56ec8f2
dc.identifier.otherORCID: /0000-0001-5169-0337/work/81797601
dc.identifier.otherScopus: 85091535743
dc.identifier.otherWOS: 000577248100027
dc.description.abstractMost present-day resonant systems, throughout physics and engineering, are characterized by a strict time-reversal symmetry between the rates of energy coupled in and out of the system, which leads to a trade-off between how long a wave can be stored in the system and the system’s bandwidth. Any attempt to reduce the losses of the resonant system, and hence store a (mechanical, acoustic, electronic, optical, or of any other nature) wave for more time, will inevitably also reduce the bandwidth of the system. Until recently, this time-bandwidth limit has been considered fundamental, arising from basic Fourier reciprocity. In this work, using a simple macroscopic, fiber-optic resonator where the nonreciprocity is induced by breaking its time-invariance, we report, in full agreement with accompanying numerical simulations, a time-bandwidth product (TBP) exceeding the ‘fundamental’ limit of ordinary resonant systems by a factor of 30. We show that, although in practice experimental constraints limit our scheme, the TBP can be arbitrarily large, simply dictated by the finesse of the cavity. Our results open the path for designing resonant systems, ubiquitous in physics and engineering, that can simultaneously be broadband and possessing long storage times, thereby offering a potential for new functionalities in wave-matter interactions.
dc.relation.ispartofScientific Reportsen
dc.rightsCopyright © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.titleArbitrarily high time bandwidth performance in a nonreciprocal optical resonator with broken time invarianceen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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