Probing plasmonic breathing modes optically

Journal Article · Mon Oct 27 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4900615· OSTI ID:22310638

Reisecker, Michael; Hohenau, Andreas; Ditlbacher, Harald; Trügler, Andreas; Hohenester, Ulrich; Krenn, Joachim R. ^[1]

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1. Institute of Physics, Karl-Franzens-University, Universitätsplatz 5, 8010 Graz (Austria)

The confinement of surface plasmon modes in flat nanoparticles gives rise to plasmonic breathing modes. With a vanishing net dipole moment, breathing modes do not radiate, i.e., they are optically dark. Having thus escaped optical detection, breathing modes were only recently revealed in silver nanodisks with electron energy loss spectroscopy in an electron microscope. We show that for disk diameters >200 nm, retardation induced by oblique optical illumination relaxes the optically dark character. This makes breathing modes and thus the full plasmonic mode spectrum accessible to optical spectroscopy. The experimental spectroscopy data are in excellent agreement with numerical simulations.

• OSTI ID: 22310638
• Journal Information: Applied Physics Letters, Vol. 105, Issue 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
COMPUTERIZED SIMULATION
CONFINEMENT
DETECTION
DIPOLE MOMENTS
ELECTRON MICROSCOPES
ENERGY-LOSS SPECTROSCOPY
NANOPARTICLES
SILVER
SPECTRA
SURFACES