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Coupling Bright and Dark Plasmonic Lattice Resonances

S. R. K. Rodriguez1,*, A. Abass2, B. Maes3, O. T. A. Janssen4, G. Vecchi1, and J. Gómez Rivas1,5

  • 1Center for Nanophotonics, FOM Institute AMOLF, c/o Philips Research Laboratories, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
  • 2Department of Electronic and Information Systems (ELIS), Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium
  • 3Micro- and Nanophotonic Materials Group, Institut de Physique, University of Mons, Place du Parc 20, B-7000 Mons, Belgium
  • 4Optics Research Group, Delft University of Technology, 2628 CJ Delft, The Netherlands
  • 5Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

  • *s.rodriguez@amolf.nl
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Phys. Rev. X 1, 021019 – Published 15 December, 2011

DOI: https://doi.org/10.1103/PhysRevX.1.021019

Abstract

We demonstrate the coupling of bright and dark surface lattice resonances (SLRs), which are collective Fano resonances in 2D plasmonic crystals. As a result of this coupling, a frequency stop gap in the dispersion relation of SLRs is observed. The different field symmetries of the low- and high-frequency SLR bands lead to pronounced differences in their coupling to free-space radiation. Standing waves of very narrow spectral width compared to localized surface-plasmon resonances are formed at the high-frequency band edge, while subradiant damping onsets at the low-frequency band edge, leading the resonance into darkness. We introduce a coupled-oscillator analog to the plasmonic crystal, which serves to elucidate the physics of the coupled plasmonic resonances and which is used to estimate very high quality factors for SLRs.

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Popular Summary

Metallic nanoparticles behave as tiny antennas for light. Light illuminating such a particle can drive its mobile electrons into a collective oscillation called localized surface-plasmon resonances. The oscillating electronic current then emits light in certain directions determined by the size and geometry of the particle. The possibility they offer for the manipulation of light at nanoscales has been explored and exploited in several applications such as light emitting devices, optical sensors, and solar cells. There is a major challenge in such applications: the high losses associated with the damping of the electronic current by the material resistance and by the emission of light. In this paper of combined experimental and theoretical work on periodic arrays of metallic nanorods, we report our finding, and understanding, of a class of plasmonic resonances with very low losses—the lowest reported so far–and with additional desirable properties.

The periodic arrays of metallic nanorods we have investigated diffract light in a similar way as optical gratings do: Beautiful rainbows are reflected or transmitted under white-light illumination. Therefore, light shone on such an array not only excites localized surface-plasmon resonances on the individual nanorods, but also gets diffracted in an ordered fashion. The diffracted light, in fact, is able to couple the localized surface-plasmon modes on the individual nanorods to each other. This coupling leads to resonances at a higher level: collective ones among the modes on the nanorods, known already as surface lattice resonances. What we have discovered and understood are the following: (1) by varying the angle of incidence of the illuminating light, collective lattice resonances of different frequencies can be excited, depending on the order of the diffracted light that underlies their individual emergences; (2) these collective lattice resonances are, in turn, also coupled to each other; (3) as a result of that coupling, lattice resonances of certain frequencies become forbidden, in other words, a frequency stop gap appears; (4) these lattice plasmonic modes suffer very low losses.

These findings offer a new line of possibilities to tailor plasmonic resonances in a frequency-, angle-, and polarization-dependent manner in devices and also hold a promise for the development of low-loss plasmonic devices.

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Phys. Rev. X 1, 021019– Published 15 December, 2011
  • Received 25 March 2011
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This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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