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RESEARCH PRODUCT

Reversible Strong Coupling in Silver Nanoparticle Arrays Using Photochromic Molecules

Alexandre BouhelierAlessandro VeltriRenaud BachelotPierre-michel AdamAnne-laure BaudrionAntoine Perron

subject

exciton−plasmon couplingPlasmonBioengineering02 engineering and technology010402 general chemistryPhotochemistry01 natural sciencesSilver nanoparticlePhotochromismchemistry.chemical_compoundactive plasmonicsGeneral Materials Science[SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/MicroelectronicsSurface plasmon resonancePlasmonRabi splittingSpiropyranChemistryMechanical EngineeringResonanceGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter Physicsspiropyran0104 chemical sciencesChemical physicsExcited state[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic0210 nano-technologyLocalized surface plasmon

description

International audience; In this Letter, we demonstrate a reversible strong coupling regime between a dipolar surface plasmon resonance and a molecular excited state. This reversible state is experimentally observed on silver nanoparticle arrays embedded in a polymer film containing photochromic molecules. Extinction measurements reveal a clear Rabi splitting of 294 meV, corresponding to ∼13% of the molecular transition energy. We derived an analytical model to confirm our observations, and we emphasize the importance of spectrally matching the polymer absorption with the plasmonic resonance to observe coupled states. Finally, the reversibility of this coupling is illustrated by cycling the photochromic molecules between their two isomeric forms.

https://doi.org/10.1021/nl3040948