Not yet.
Data taken from Web of Science. I compare the publication rate of papers on topological photonics with some other hot topics in photonics during my graduate studies. Of course, the number of publications measures interest in a topic and does not necessarily correlate with real progress.
Whether topological photonics was close to reaching a plateau was a topic of discussion during a workshop I attended in 2019. Close to half of all papers on topological photonics have been published since 2019! During this period the main emerging research directions have been nonlinear effects, non-Hermitian topological structures (i.e. with gain and/or loss), higher order topological phases, and bulk topological defects. Ongoing experimental efforts in all of these directions is likely to sustain interest for the next few years, at least. Will the peak be followed by a sustained plateau or an immediate decline?
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