Surface Plasmon Assisted Control of Hot-Electron
Relaxation Time
Posted on 2020-05-27 - 00:49
Surface plasmon mediated hot carrier generation is widely utilized for the manipulation of the
electron-photon interactions in many types of optoelectronic devices including solar cells, photodiodes,
and optical modulators. A diversity of plasmonic systems such as nanoparticles, resonators,
and waveguides have been introduced to enhance hot carrier generation; however, the
impact of the propagating surface plasmons on hot carrier lifetime has not been clearly demonstrated.
Here, we systematically study the hot carrier relaxation in thin film gold (Au) samples
under surface plasmon coupling with the Kretschmann configuration. We observe that the locally
confined electric field at the surface of the metal significantly affects the hot carrier distribution
and electron temperature, which results in a slowing of the hot electrons relaxation
time, regardless of the average value of the absorbed power in the Au thin film. This result
could be extended to other plasmonic nanostructures, enabling the control of hot carrier lifetimes
throughout the optical frequency range.
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Memarzadeh, Sarvenaz; Kim, Jongbum; Aytac, Yigit; Munday, Jeremy; Murphy, Thomas (2020). Surface Plasmon Assisted Control of Hot-Electron
Relaxation Time. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4954361.v1
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AUTHORS (5)
SM
Sarvenaz Memarzadeh
JK
Jongbum Kim
YA
Yigit Aytac
JM
Jeremy Munday
TM
Thomas Murphy