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Dynamics of Strong Coupling between J‐Aggregates and Surface Plasmon Polaritons in Subwavelength Hole Arrays
Author(s) -
Wang Hai,
Wang HaiYu,
Bozzola Angelo,
Toma Andrea,
Panaro Simone,
Raja Waseem,
Alabastri Alessandro,
Wang Lei,
Chen QiDai,
Xu HuaiLiang,
De Angelis Francesco,
Sun HongBo,
Zaccaria Remo Proietti
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201601452
Subject(s) - exciton , materials science , excitation , plasmon , coupling (piping) , surface plasmon polariton , polariton , molecular physics , absorption (acoustics) , ultrafast laser spectroscopy , resonance (particle physics) , spectral line , j aggregate , molecule , surface plasmon , optoelectronics , atomic physics , spectroscopy , condensed matter physics , physics , quantum mechanics , metallurgy , composite material
A prototypical hybrid system formed by strong coupled gold hole arrays and J‐aggregate molecules is investigated by using both steady‐state spectroscopic method and ultrafast pump‐probe approach. In particular, the plasmonic response of the device has been tuned by modifying its periodicity thus to achieve the strongest possible coupling regime. It is found that in the transient absorption spectra, under upper band excitation, the bleaching signal from uncoupled J‐aggregate molecules completely disappears. Instead, two distinctive period dependent bleaching bands are formed, clearly fingerprint of the hybrid exciton‐plasmon state. The dynamics of these bands is also directly analyzed. A remarkable long lifetime is found especially for the upper band, corresponding to the presence of a trap state in its transient absorption spectra under resonance excitation. Such unique feature should provide a new approach to control quantum‐mechanical states under coherent coupling.