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Physics Colloquium, N. Asger Mortensen, "Quantum and nonlocal electrodynamics in plasmonic nanostructures"

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Physics Colloquium, N. Asger Mortensen, "Quantum and nonlocal electrodynamics in plasmonic nanostructures"
When Sep 11, 2019
from 04:00 PM to 05:00 PM
Where MR418N
Contact Name
Contact Phone 212-650-7443
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Physics Colloquium

Dr. techn. N. Asger Mortensen

Professor, University of Southern Denmark, Nano Optics and The Mads Clausen Institute
VILLUM Investigator
Danish Institute for Advanced Study Chair of Technical Science
Fellow of APS, OSA, SPIE & IOP

"Quantum and nonlocal electrodynamics in plasmonic nanostructures"

Plasmonics is commonly explored and interpreted within the framework of classical electrodynamics. On the other hand, with the increasing ability to explore plasmons in nanostructures with yet smaller characteristic dimensions, intrinsic length scales of the electron gas are anticipated to manifest in a nonlocal plasmonic response and other quantum corrections to the light-matter interactions. Efforts to make semi-classical hydrodynamic extensions of the Drude model [1,2] will be reviewed, as well as developments beyond these simplified models [3-5]. In nanoparticles, nonlocal response promotes frequency blueshifts and nonlocal damping of high-order modes, as has been observed in single-particle EELS [6]. As to the quantum mechanical origin of these effects, we quantify the degree of nonclassical effects from an energy perspective [7]. This provides a direct link between experimentally observed resonance blueshifts and the fraction of electromagnetic energy attributed to quantum degrees of freedom. Finally, implications of nonlocal dynamics for both classical and quantum optical problems in nanoplasmonics will be briefly discussed [8-10].

[1] N.A. Mortensen et al., "A generalized non-local optical response theory for plasmonic nanostructures", Nat. Commun. 5, 3809 (2014)
[2] G. Toscano et al., "Resonance shifts and spill-out effects in self-consistent hydrodynamic nanoplasmonics," Nat. Commun. 6, 7132, (2015)
[3] W. Yan et al., "Projected Dipole Model for Quantum Plasmonics", Phys. Rev. Lett. 115, 137403 (2015)
[4] T. Christensen et al., "Quantum corrections in nanoplasmonics: shape, scale, and material", Phys. Rev. Lett. 118, 157402 (2017)
[5] P.A.D. Gonçalves et al., "Plasmon-Emitter Interactions at the Nanoscale", arXiv:1904.09279
[6] S. Raza et al., "Multipole plasmons and their disappearance in few-nanometer silver nanoparticles", Nat. Commun. 6, 8788 (2015)
[7] W. Yan and N.A. Mortensen, "Nonclassical effects in plasmonics: An energy perspective to quantify nonclassical effects", Phys. Rev. B 93, 115439 (2016)
[8] A.I. Fernández-Domínguez, S.I. Bozhevolnyi, and N.A. Mortensen, "Plasmon-enhanced generation of non-classical light", ACS Photonics 5, 3447 (2018)
[9] N.A. Mortensen, S.I. Bozhevolnyi, and A. Alù, "Topological Nanophotonics", Nanophotonics 8, 1315 (2019)
[10] C. Tserkezis et al., "On the applicability of quantum-optical concepts in strong-coupling nanophotonics", arXiv:1907.02605

Biography: Mortensen is a full professor & VILLUM Investigator in the Center for Nano Optics and a Chair of Technical Science in the Danish Institute for Advanced Study, both at the University of Southern Denmark. Previously, he held a full professorship (faculty since 2004) at the Technical University of Denmark, from where he was also awarded his academic degrees [Dr. Techn. (2006), PhD (2001), MSc (1998)]. He is a fellow of APS, OSA, SPIE, and IOP.