Comparison of the ultrafast hot electron dynamics of titanium nitride and gold for plasmonic applications
| Autor: | Lesley F. Cohen, Andrei P. Mihai, Yi Li, Brock Doiron, Peter K. Petrov, Stefan A. Maier, Neil McN. Alford, Rupert F. Oulton |
|---|---|
| Přispěvatelé: | Tsai, DP, Tanaka, T, Engineering & Physical Science Research Council (EPSRC), Engineering & Physical Science Research Council (E |
| Rok vydání: | 2017 |
| Předmět: |
Technology
Materials science Materials Science chemistry.chemical_element Physics::Optics Nanotechnology Materials Science Multidisciplinary 02 engineering and technology Electron Titanium nitride 01 natural sciences plasmonics chemistry.chemical_compound Condensed Matter::Materials Science 0103 physical sciences Thin film Plasmon 010302 applied physics Science & Technology Scattering business.industry Chemistry Physical Optics 021001 nanoscience & nanotechnology Thermal conduction THERMALIZATION Chemistry chemistry electron dynamics Physical Sciences Optoelectronics 0210 nano-technology business Ultrashort pulse hot electrons Titanium |
| Zdroj: | SPIE Optics + Photonics Conference on Plasmonics-Design, Materials, Fabrication, Characterization, and Applications XV |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|