Unconventional time-bandwidth performance of resonant cavities with nonreciprocal coupling
MetadataShow full item record
The time-bandwidth limit is a mathematical tenet that affects all reciprocal resonators, stating that the product of the spectral bandwidth that can couple into a resonant system and its characteristic energy decay time is always equal to 1. Here, we develop an analytical and numerical model to show that introducing nonreciprocal coupling to a generalized resonator changes the power balance between the reflected and intracavity fields, which consequently overcomes the time-bandwidth limit of the resonant system. By performing a full evaluation of the time-bandwidth product (TBP) of the modeled resonator, we show that it represents a measure of the increased delay imparted to a light wave, with respect to what the bandwidth of the reciprocal resonant structure would allow to the same amount of in-coupled power. No longer restricted to the value 1, we show that the TBP can instead be used as a figure of merit of the improvement in intracavity power enhancement due to the nonreciprocal coupling.
Cardea , I , Grassani , D , Upham , J , Schulz , S A , Tsakmakidis , K L & Bres , C-S 2021 , ' Unconventional time-bandwidth performance of resonant cavities with nonreciprocal coupling ' , Physical Review. A, Atomic, molecular, and optical physics , vol. 103 , no. 1 , 013716 . https://doi.org/10.1103/PhysRevA.103.013716
Physical Review. A, Atomic, molecular, and optical physics
Copyright © 2021 American Physical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevA.103.013716.
DescriptionFunding: Hellenic Foundation for Research and Innovation (HFRI), General Secretariat for Research and Technology (GSRT) (No. 1819) (KLT).
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.