Photoinduced Electron Transfer in the Strong Coupling Regime: Waveguide–Plasmon Polaritons
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2016-04-13
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Nano Letters
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AMER CHEMICAL SOC
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Electrical and Electronic Engineering
School of Chemistry
School of Mathematics and Statistics
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School of Chemistry
School of Mathematics and Statistics
School of Physics
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Zeng, P., Cadusch, J., Chakraborty, D., Smith, T. A., Roberts, A., Sader, J. E., Davis, T. J. & Gómez, D. E. (2016). Photoinduced Electron Transfer in the Strong Coupling Regime: Waveguide–Plasmon Polaritons. Nano Letters, 16 (4), pp.2651-2656. https://doi.org/10.1021/acs.nanolett.6b00310.
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Abstract
Reversible exchange of photons between a material and an optical cavity can lead to the formation of hybrid light-matter states where material properties such as the work function [ Hutchison et al. Adv. Mater. 2013 , 25 , 2481 - 2485 ], chemical reactivity [ Hutchison et al. Angew. Chem., Int. Ed. 2012 , 51 , 1592 - 1596 ], ultrafast energy relaxation [ Salomon et al. Angew. Chem., Int. Ed. 2009 , 48 , 8748 - 8751 ; Gomez et al. J. Phys. Chem. B 2013 , 117 , 4340 - 4346 ], and electrical conductivity [ Orgiu et al. Nat. Mater. 2015 , 14 , 1123 - 1129 ] of matter differ significantly to those of the same material in the absence of strong interactions with the electromagnetic fields. Here we show that strong light-matter coupling between confined photons on a semiconductor waveguide and localized plasmon resonances on metal nanowires modifies the efficiency of the photoinduced charge-transfer rate of plasmonic derived (hot) electrons into accepting states in the semiconductor material. Ultrafast spectroscopy measurements reveal a strong correlation between the amplitude of the transient signals, attributed to electrons residing in the semiconductor and the hybridization of waveguide and plasmon excitations.