While metallic, hot-electron-based photoelectric conversion has been drawing much attention in the past few years, hot-electron carrier transport in periodically nanostructured metal in the presence of surface plasmons (SPs) or an applied electric field remains in negligence from the experimental standpoint. On the basis of what we have developed in theoretical formalism and experimental demonstrations, the proposed research will explore the time-resolved carrier dynamics in nanostructured metal in multilayered metal-insulator-metal configuration using ultrashort laser pulses. Key areas to be investigated are field/light intensity effects in transient absorptance, transition from the localized surface plasmon (LSP) to the interference of SP waves, electron relaxation time, and polarization dependence of hot electron generations. Carrier transport theory based on quantum treatment using three-dimensional, realistic energy bandstructure and k-/energy-resolved group velocity in the presence of perturbed Hamiltonian will be developed and modified using empirical data acquired from time-resolved pump-probe measurements. In addition, opto-electro-thermal interactions in photoelectric conversion will also be investigated in order to reveal the potential limitation of the conversion efficiency. All the effort leads to extend the knowledge of non-ballistic transport of hot electrons in metallic, hot-electron-based devices and optimum device designs in favor of minimum inelastic collision losses. The research results will also provide sufficient data for assessing the potential application of such devices in ultra-high-speed optical communications.
|Effective start/end date||1/08/18 → 31/10/19|
UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):
- photoelectric conversion
- surface plasmon polariton
- hot electrons
- ultrafast optics
- carrier dynamics
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