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Temporal coherence of surface plasmons in silver waveguides

TitleTemporal coherence of surface plasmons in silver waveguides
Publication TypeJournal Article
Year of Publication2021
AuthorsSur, S, Ghosh, A, Venkataraman, V
JournalJOSA B

Surface plasmon polaritons, in spite of being lossy, are known to preserve their coherence over long distances. In this paper, we investigate the coherence of surface plasmons propagating on a silver thin film surface using free-space optical Mach–Zehnder interferometry, where they are found to maintain their temporal coherence up to 80 µm, thus setting, for the first time to the best of our knowledge, a new limit. This can be important in applications integrating plasmonics with quantum information processing, where decoherence is a major challenge.