Comparison of the ultrafast hot electron dynamics of titanium nitride and gold for plasmonic applications

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Title: Comparison of the ultrafast hot electron dynamics of titanium nitride and gold for plasmonic applications
Authors: Doiron, B
Li, Y
Mihai, AP
Cohen, LF
Pretrov, PK
Alford, NM
Oulton, RF
Maier, SA
Item Type: Conference 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.
Editors: Tsai, DP
Tanaka, T
Issue Date: 25-Aug-2017
Date of Acceptance: 1-Aug-2017
URI: http://hdl.handle.net/10044/1/56538
DOI: https://dx.doi.org/10.1117/12.2273941
ISSN: 0277-786X
Publisher: SPIE-INT SOC OPTICAL ENGINEERING
Journal / Book Title: PLASMONICS: DESIGN, MATERIALS, FABRICATION, CHARACTERIZATION, AND APPLICATIONS XV
Volume: 10346
Copyright Statement: © 2017 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/G060940/1
EP/M013812/1
Conference Name: SPIE Optics + Photonics Conference on Plasmonics - Design, Materials, Fabrication, Characterization, and Applications XV
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Optics
Chemistry
Materials Science
Titanium nitride
plasmonics
electron dynamics
hot electrons
THERMALIZATION
Publication Status: Published
Start Date: 2017-08-06
Finish Date: 2017-08-10
Conference Place: San Diego, CA
Appears in Collections:Faculty of Engineering
Materials
Physics
Experimental Solid State
Faculty of Natural Sciences



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