Nonreciprocal cavities and the time-bandwidth limit: comment

Kosmas L. Tsakmakidis; Yun You; Tomasz Stefański; Linfang Shen

doi:10.1364/optica.384840

Nonreciprocal cavities and the time-bandwidth limit: comment

Abstract

In their paper in Optica 6, 104 (2019), Mann et al. claim that linear, time-invariant nonreciprocal structures cannot overcome the time-bandwidth limit and do not exhibit an advantage over their reciprocal counterparts, specifically with regard to their time-bandwidth performance. In this Comment, we argue that these conclusions are unfounded. On the basis of both rigorous full-wave simulations and insightful physical justifications, we explain that the temporal coupled-mode theory, on which Mann et al. base their main conclusions, is not suited for the study of nonreciprocal trapped states, and instead direct numerical solutions of Maxwell’s equations are required. Based on such an analysis, we show that a nonreciprocal terminated waveguide, resulting in a trapped state, clearly outperforms its reciprocal counterpart; i.e., both the extraordinary time-bandwidth performance and the large field enhancements observed in such modes are a direct consequence of nonreciprocity.

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Publication version: Accepted or Published Version
License: Copyright (2020 Optical Society of America)

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PHOTONICS

Details

Category:: Articles
Type:: artykuły w czasopismach
Published in:: Optica no. 7, pages 1097 - 1101,
ISSN: 2334-2536
Language:: English
Publication year:: 2020
Bibliographic description:: Tsakmakidis K., You Y., Stefański T., Shen L.: Nonreciprocal cavities and the time-bandwidth limit: comment// Optica -Vol. 7,iss. 9 (2020), s.1097-1101
DOI:: Digital Object Identifier (open in new tab) 10.1364/optica.384840
Verified by:: Gdańsk University of Technology