Quantum Optics Colloquium by N. Asger Mortensen – Niels Bohr Institute - University of Copenhagen

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Quantum Optics Colloquium by N. Asger Mortensen

Abstract— Nanoplasmonic structures may exhibit nonlocal response when shrinking their characteristic dimensions to a regime where quantum phenomena are commonly expected to become important. This talk will address a semi-classical hydrodynamic description [1-4] as a first natural attempt that goes beyond the common description based on the local-response approximation, i.e., Ohm’s law. Including the hydrodynamic response of the Fermi gas adds an intrinsic length scale to the electrodynamics, thus smearing the possible development of singular response inherent to a local-response approximation. In contrast to insight from the local-response approximation, transverse-light excitation may also exhibit oscillations above the plasma frequency with a longitudinal nature, i.e., confined bulk-like plasmons [5]. Starting from a generalized nonlocal wave equation, consequences for plasmonic waveguide [3] and dimer [6] structures supporting enhanced light-matter interactions will be discussed.

References:

  1. S. Raza et al., Phys. Rev. B 84, 121412(R) (2011)
  2. G. Toscano et al., Opt. Express 20, 4176 (2012)
  3. G. Toscano et al., Nanophotonics 2, 161 (2013)
  4. N.A. Mortensen, Phot. Nanostr. 11, 303 (2013)
  5. T. Christensen et al., ACS Nano 8, 1745 (2014)

N.A. Mortensen et al., Nature Commun. 5, 3809 (2014)