Electrochemically Switchable Multimode Strong Coupling in Plasmonic Nanocavities

Yanji Yang, Rohit Chikkaraddy, Qianqi Lin, Daniel D. A. Clarke, Daniel Wigger, Jeremy J. Baumberg*, Ortwin Hess*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
35 Downloads (Pure)

Abstract

The strong-coupling interaction between quantum emitters and cavities provides the archetypical platform for fundamental quantum electrodynamics. Here we show that methylene blue (MB) molecules interact coherently with subwavelength plasmonic nanocavity modes at room temperature. Experimental results show that the strong coupling can be switched on and off reversibly when MB molecules undergo redox reactions which transform them to leuco-methylene blue molecules. In simulations we demonstrate the strong coupling between the second excited plasmonic cavity mode and resonant emitters. However, we also show that other detuned modes simultaneously couple efficiently to the molecular transitions, creating unusual cascades of mode spectral shifts and polariton formation. This is possible due to the relatively large plasmonic particle size resulting in reduced mode splittings. The results open significant potential for device applications utilizing active control of strong coupling.
Original languageEnglish
Pages (from-to)238-244
Number of pages7
JournalNano letters
Volume24
Issue number1
Early online date2 Jan 2024
DOIs
Publication statusPublished - 10 Jan 2024

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