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Optically induced crossover from weak to strong coupling regime between surface plasmon polaritons and photochromic molecules

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Original languageEnglish
Pages (from-to)26509-26518
Number of pages10
JournalOptics Express
Issue number18
Publication statusPublished - 31 Aug 2020
Publication typeA1 Journal article-refereed


We demonstrate optically induced crossover from a weak to a strong coupling regime in a single photonic system consisting of propagating surface plasmon polaritons (SPPs) on a planar silver film and ultraviolet (UV)-switchable photochromic molecules. A gradual increase is observed in the vacuum Rabi splitting upon increasing UV exposure, along with intriguing behavior, where the reflectivity initially decreases due to increased losses at the weak coupling regime, and then increases due to the emergence of strongly coupled modes and the associated band gap formation at the resonance frequency of the uncoupled states. This work explicitly demonstrates the optical tunability of the degree of hybridization of the SPP and exciton modes, spanning the range from weak to intermediate and finally to the strong coupling regime.

Publication forum classification

Field of science, Statistics Finland