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Proceedings Paper

Comparison of the ultrafast hot electron dynamics of titanium nitride and gold for plasmonic applications
Author(s): Brock Doiron; Yi Li; Andrei P. Mihai; Lesley F. Cohen; Peter K. Petrov; Neil M. Alford; Rupert F. Oulton; Stefan A. Maier
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Paper Abstract

With similar optical properties to gold and high thermal stability, titanium nitride continues to prove itself as a promising plasmonic material for high-temperature applications in the visible and near-infrared. In this work, we use transient pump probe differential reflection measurements to compare the electron energy decay channels in titanium nitride and gold thin films. Using an extended two temperature model to incorporate the photoexcited electrons, it is possible to separate the electron-electron and electron-phonon scattering contributions immediately following the arrival of the pump pulse. This model allows for incredibly accurate determination of the internal electronic properties using only optical measurements. As the electronic properties are key in hot electron applications, we show that titanium nitide has substantially longer electron thermalization and electron-phonon scattering times. With this, we were also able to resolve electron thermal conduction in the film using purely optical measurements.

Paper Details

Date Published: 25 August 2017
PDF: 5 pages
Proc. SPIE 10346, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV, 1034604 (25 August 2017); doi: 10.1117/12.2273941
Show Author Affiliations
Brock Doiron, Imperial College London (United Kingdom)
Yi Li, Imperial College London (United Kingdom)
Andrei P. Mihai, Imperial College London (United Kingdom)
Lesley F. Cohen, Imperial College London (United Kingdom)
Peter K. Petrov, Imperial College London (United Kingdom)
Neil M. Alford, Imperial College London (United Kingdom)
Rupert F. Oulton, Imperial College London (United Kingdom)
Stefan A. Maier, Imperial College London (United Kingdom)

Published in SPIE Proceedings Vol. 10346:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV
Din Ping Tsai; Takuo Tanaka, Editor(s)

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