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This disparity in length scales between a molecule and the electromagnetic field limits light-matter interactions to common dipole-type processes. 1 Å), whereas the characteristic length scale of the electromagnetic field can be defined for a plane wave by its wavelength (ca.
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The characteristic length scale of such excitations is typically on the molecular size scale (ca.
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Light-Matter Interactions in the Near Field. The interaction of light with matter is primarily entailed by the excitation of electronic and vibrational modes by the electromagnetic field of light. Our lab is using single-molecule super-resolution imaging techniques borrowed from the the biophysics community, and high-resolution electron microscopy, to resolve individual active sites on a catalyst surface. By mapping the distribution, structural composition, and heterogeneity of active sites, we seek to enhance understanding of catalytic materials and processes. Particular focus is on catalysts for water-splitting and CO2 to methanol conversion. In most cases, the identity of the active site is still in question. This is primarily because of the involvement of surfaces that are often chemically complex and heterogeneous. Super-Resolution Imaging of Heterogeneous Catalysts. Catalytic processes, despite their importance in the chemical industry as well as in solar-to-fuel conversion, remain poorly understood. The systems we investigate range from artificial photosynthetic systems to nanophotonic switches. The tools we use include single-molecule spectroscopy, nanofabrication, high-resolution electron microscopy, and plasmonics. We are a diverse team with interest and expertise in spectroscopy, materials science, and condensed matter physics.
K PRASANTH HOW TO
In summary, we are learning how to control and harness light as a source of energy and as a means to control the attributes and function of advanced materials. Iii) We design materials and coax them into exhibiting non-natural optical or optoelectronic phenomena. Ii) We image with unprecedented resolution chemical reactions on surfaces or in nanoparticles and uncover their mechanistic pathways.
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I) We employ the rich interplay between visible light and metal catalysts for selective formation of energy-dense chemical bonds. There are three aspects of the light-matter interface that we study using spectroscopy, microscopy, and theory: Light-matter interactions are central in nature, life, and in technology.