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Title: Ultrafast dynamics of metal plasmons induced by 2D semiconductor excitons in hybrid nanostructure arrays

Journal Article · · ACS Photonics

With the advanced progress achieved in the field of nanotechnology, localized surface plasmons resonances (LSPRs) are actively considered to improve the efficiency of metal-based photocatalysis, photodetection, and photovoltaics. Here, we report on the exchange of energy and electric charges in a hybrid composed of a two-dimensional tungsten disulfide (2D-WS2) monolayer and an array of aluminum (Al) nanodisks. Femtosecond pump-probe spectroscopy results indicate that within ~830 fs after photoexcitation of the 2D-WS2 semiconductor, energy transfer from the 2D-WS2 excitons excites the plasmons of the Al array. Then, upon the radiative and/or nonradiative damping of these excited plasmons, energy and/or electron transfer back to the 2D-WS2 semiconductor takes place as indicated by an increase in the reflected probe at the 2D exciton transition energies at later time-delays. This simultaneous exchange of energy and charges between the metal and the 2D-WS2 semiconductor resulted in an extension of the average lifetime of the 2D-excitons from ~15 to ~58 ps in absence and presence of the Al array, respectively. Furthermore, the indirectly excited plasmons were found to live as long as the 2D-WS2 excitons exist. Furthermore, the demonstrated ability to generate exciton-plasmons coupling in a hybrid nanostructure may open new opportunities for optoelectronic applications such as plasmonic-based photodetection and photocatalysis.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1337500
Journal Information:
ACS Photonics, Vol. 3, Issue 12; ISSN 2330-4022
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Environmental engineering of transition metal dichalcogenide optoelectronics journal June 2018
Strong-coupling of WSe2 in ultra-compact plasmonic nanocavities at room temperature journal November 2017
Band Structure Engineering of Interfacial Semiconductors Based on Atomically Thin Lead Iodide Crystals journal March 2019
Interplay and coupling of electric and magnetic multipole resonances in plasmonic nanoparticle lattices journal June 2018
Laser Synthesis, Processing, and Spectroscopy of Atomically-Thin Two Dimensional Materials book January 2018
Lattice Kerker effect in the array of hexagonal boron nitride antennas journal January 2018
Transition Metal Dichalcogenide Nanoantennas Lattice journal January 2019
Directional scattering by the hyperbolic-medium antennas and silicon particles journal January 2018
Lattice Resonances in Transdimensional WS2 Nanoantenna Arrays journal May 2019
Strong-coupling of WSe2 in ultra-compact plasmonic nanocavities at room temperature text January 2017