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Yang Y, Chikkaraddy R, Lin Q, Clarke DDA, Wigger D, Baumberg JJ, Hess O. Electrochemically Switchable Multimode Strong Coupling in Plasmonic Nanocavities. NANO LETTERS 2024; 24:238-244. [PMID: 38164905 PMCID: PMC10786147 DOI: 10.1021/acs.nanolett.3c03814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/27/2023] [Accepted: 12/27/2023] [Indexed: 01/03/2024]
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.
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Affiliation(s)
- Yanji Yang
- School
of Physics, Trinity College Dublin, Dublin 2, D02 PN40, Ireland
| | - Rohit Chikkaraddy
- NanoPhotonics
Centre, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
- School
of Physics and Astronomy, University of
Birmingham, Birmingham B152TT, England, U.K.
| | - Qianqi Lin
- NanoPhotonics
Centre, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
- Hybrid
Materials for Optoelectronics Group, Department of Molecules and Materials,
MESA+ Institute for Nanotechnology, Molecules Center and Center for
Brain-Inspired Nano Systems, Faculty of Science and Technology, University of Twente, 7500AE Enschede, The Netherlands
| | | | - Daniel Wigger
- School
of Physics, Trinity College Dublin, Dublin 2, D02 PN40, Ireland
| | - Jeremy J. Baumberg
- NanoPhotonics
Centre, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, U.K.
| | - Ortwin Hess
- School
of Physics, Trinity College Dublin, Dublin 2, D02 PN40, Ireland
- CRANN
Institute and Advanced Materials and Bioengineering Research Centre, Trinity College Dublin, Dublin 2, D02 PN40, Ireland
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Gettapola K, Hapuarachchi H, Stockman MI, Premaratne M. Control of quantum emitter-plasmon strong coupling and energy transport with external electrostatic fields. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:125301. [PMID: 31770745 DOI: 10.1088/1361-648x/ab5bd3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We investigate a system comprised of a constellation quantum emitters interacting with a localized surface plasmon mode of a metal nanoparticle subject to an externally applied electrostatic field. Due to the strong interactions among the electric field and the plasmonic setup, we show that system enters collective strong coupling regime generating polariton states when the intensity of the applied electrostatic field is increased. This in turn enhances the exciton energy transport rates between two emitters in the system when a single emitter is incoherently pumped. We further analyze how the placement of quantum emitter dipole moment orientation affects the observed collective strong coupling and how the electrostatic field can be used to put our setup to either weak or strong coupling regimes via the interacting electrostatic field.
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Affiliation(s)
- Kamani Gettapola
- Advanced Computing and Simulation Laboratory (AχL), Department of Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria 3800, Australia
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