Extraordinary Light-Induced Local Angular Momentum near Metallic Nanoparticles.
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The intense local field induced near metallic nanostructures provides strong enhancements for surface-enhanced spectroscopies, a major focus of plasmonics research over the past decade. Here we consider that plasmonic nanoparticles can also induce remarkably large electromagnetic field gradients near their surfaces. Sizeable field gradients can excite dipole-forbidden transitions in nearby atoms or molecules and provide unique spectroscopic fingerprinting for chemical and bimolecular sensing. Specifically, we investigate how the local field gradients near metallic nanostructures depend on geometry, polarization, and wavelength. We introduce the concept of the local angular momentum (LAM) vector as a useful figure of merit for the design of nanostructures that provide large field gradients. This quantity, based on integrated fields rather than field gradients, is particularly well-suited for optimization using numerical grid-based full wave electromagnetic simulations. The LAM vector has a more compact structure than the gradient matrix and can be straightforwardly associated with the angular momentum of the electromagnetic field incident on the plasmonic structures.
electric field gradient
local angular momentum
optical angular momentum
Published Version (Please cite this version)10.1021/acsnano.6b01851
Publication InfoAlabastri, A; Yang, X; Manjavacas, A; Everitt, Henry; & Nordlander, P (2016). Extraordinary Light-Induced Local Angular Momentum near Metallic Nanoparticles. ACS Nano, 10(4). pp. 4835-4846. 10.1021/acsnano.6b01851. Retrieved from http://hdl.handle.net/10161/13865.
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Adjunct Professor of Physics
Dr. Everitt is one of the Army's chief scientists. He works at the Army's Aviation and Missile RD&E Center at Redstone Arsenal, AL. Through his adjunct appointment in the Duke Physics Department, he leads an active experimental research group in condensed matter physics, nanophotonics, molecular physics, and novel terahertz imaging with colleagues on campus and through an international network of collaborators. Four principal research areas are being pursued: 1) Ultrafast Spectroscopy.