Hot-electron science and microscopic processes in plasmonics and catalysis: Faraday Discussion
Country: United Kingdom
Abstr. due: 04.06.2018
Dates: 18.02.19 — 20.02.19
Area Of Sciences: Chemistry;
Organizing comittee e-mail: http://www.rsc.org/events/detail/27637/hot-electron-science-and-microscopic-processes-in-plasmonics-
Organizers: Royal Society of Chemistry
Over the last 10 years, the field of plasmonic research has emerged as an extremely promising technology with several main fields of application: information technologies, energy, high-density data storage, photovoltaics, chemistry, biology, medicine and security. One of the most prominent applications, bridging the physical, chemical and biomedical sciences, has been in the area of sensing, where the intense nanoscale light fields around metallic nanostructures have been utilized for surface-enhanced spectroscopies of molecules.
While up to a few years ago the main focus has been on the ability of plasmonic nanostructures to generate such localized regions of highly concentrated electromagnetic fields, more recently it has been realized that also the electron part of plasmonic excitations can be exploited in the physical and chemical sciences: when a plasmon decays, its energy gets transferred to an electron/hole pair, and for a short period, below one picosecond, these carriers stay “hot” — they are in a non-equilibrium energy distribution, that can be exploited if these carriers can be extracted from the plasmonic nanostructures before thermalization to the lattice occurs. Proof-of-concept applications have over the last three years shown fascinating applications in areas such as surface-enhanced catalysis (water splitting), photodetectors without bandgaps (Schottky juntions), and nanoscale control over chemical reactions. At the same time, theoretical understanding about the generation, transport and extraction of plasmonic hot carriers has also advanced. The recent progress and the addressing of the main challenging questions in this dynamic field, spanning the experimental and theoretical sciences in physics and chemistry are the topic of this exciting Faraday Discussion.
Dynamics of hot electron generation in metallic nanostructures
This session will discuss different experimental approaches for the observation and study of hot electron generation, transport and extraction of hot carriers in plasmonic nanostructures, both colloidal and top-down fabricated. The key challenges are to develop ways to study the ultrafast time scales of these processes, occurring on the sub-picosecond scale and we anticipate strong discussion on how to efficiently excite and extract these carriers.
Theory of hot electrons
This session will address the highly challenging topic on how to model the generation, transport and extraction of hot electrons. Spanning ab-initio theories with transport models and electromagnetic modelling, it will provide a discussion forum led by both electronic structure theorists and theoreticians investigating the electromagnetic field aspects of plasmonics. Key challenges that will be discussed include how to bridge theoretical predictions with experimental observations. A special focus will lie on how theory can guide the more efficient extraction of hot electrons.
New materials for hot electron generation
This session will focus on materials and synthesis or fabrication protocols in order to optimize the generation and extraction of hot electrons from plasmonic nanostructures. Key challenges lie in developing systems that allow efficient hot electron generation throughout the visible and near-infrared part of the electromagnetic spectrum.
Applications in catalysis, photochemistry, and photodetection
This final session will cover the rich spectrum of applications of plasmonic hot electrons, from catalysis and control over chemical reactions on the nanoscale to the development of photodetectors with enhanced sensitivities, new approaches to imaging, and biomedical and energy applications. Key challenges lie in the efficient utilization of the extracted charge carriers for each particular applications. A specific focal point will be the efficiencies needed for the real-world applications of hot-electron science.