Probing the ultimate limits of plasmonic enhancement.
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2012-08-31
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Metals support surface plasmons at optical wavelengths and have the ability to localize light to subwavelength regions. The field enhancements that occur in these regions set the ultimate limitations on a wide range of nonlinear and quantum optical phenomena. We found that the dominant limiting factor is not the resistive loss of the metal, but rather the intrinsic nonlocality of its dielectric response. A semiclassical model of the electronic response of a metal places strict bounds on the ultimate field enhancement. To demonstrate the accuracy of this model, we studied optical scattering from gold nanoparticles spaced a few angstroms from a gold film. The bounds derived from the models and experiments impose limitations on all nanophotonic systems.
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Ciracì, C, RT Hill, JJ Mock, Y Urzhumov, AI Fernández-Domínguez, SA Maier, JB Pendry, A Chilkoti, et al. (2012). Probing the ultimate limits of plasmonic enhancement. Science, 337(6098). pp. 1072–1074. 10.1126/science.1224823 Retrieved from https://hdl.handle.net/10161/7576.
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Ashutosh Chilkoti
Ashutosh Chilkoti is the Alan L. Kaganov Professor of Biomedical Engineering and Chair of the Department of Biomedical Engineering at Duke University.
My research in biomolecular engineering and biointerface science focuses on the development of new molecular tools and technologies that borrow from molecular biology, protein engineering, polymer chemistry and surface science that we then exploit for the development of applications that span the range from bioseparations, plasmonic biosensors, low-cost clinical diagnostics, and drug delivery.
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