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Extremely confined gap surface-plasmon modes excited by electrons

Author

Listed:
  • Søren Raza

    (Technical University of Denmark
    Center for Electron Nanoscopy, Technical University of Denmark)

  • Nicolas Stenger

    (Technical University of Denmark
    Center for Nanostructured Graphene (CNG), Technical University of Denmark)

  • Anders Pors

    (University of Southern Denmark)

  • Tobias Holmgaard

    (Aalborg University)

  • Shima Kadkhodazadeh

    (Center for Electron Nanoscopy, Technical University of Denmark)

  • Jakob B. Wagner

    (Center for Electron Nanoscopy, Technical University of Denmark)

  • Kjeld Pedersen

    (Aalborg University)

  • Martijn Wubs

    (Technical University of Denmark
    Center for Nanostructured Graphene (CNG), Technical University of Denmark)

  • Sergey I. Bozhevolnyi

    (University of Southern Denmark)

  • N. Asger Mortensen

    (Technical University of Denmark
    Center for Nanostructured Graphene (CNG), Technical University of Denmark)

Abstract

High-spatial and energy resolution electron energy-loss spectroscopy (EELS) can be used for detailed characterization of localized and propagating surface-plasmon excitations in metal nanostructures, giving insight into fundamental physical phenomena and various plasmonic effects. Here, applying EELS to ultra-sharp convex grooves in gold, we directly probe extremely confined gap surface-plasmon (GSP) modes excited by swift electrons in nanometre-wide gaps. We reveal the resonance behaviour associated with the excitation of the antisymmetric GSP mode for extremely small gap widths, down to ~5 nm. We argue that excitation of this mode, featuring very strong absorption, has a crucial role in experimental realizations of non-resonant light absorption by ultra-sharp convex grooves with fabrication-induced asymmetry. The occurrence of the antisymmetric GSP mode along with the fundamental GSP mode exploited in plasmonic waveguides with extreme light confinement is a very important factor that should be taken into account in the design of nanoplasmonic circuits and devices.

Suggested Citation

  • Søren Raza & Nicolas Stenger & Anders Pors & Tobias Holmgaard & Shima Kadkhodazadeh & Jakob B. Wagner & Kjeld Pedersen & Martijn Wubs & Sergey I. Bozhevolnyi & N. Asger Mortensen, 2014. "Extremely confined gap surface-plasmon modes excited by electrons," Nature Communications, Nature, vol. 5(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5125
    DOI: 10.1038/ncomms5125
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    Cited by:

    1. Natarajan Shanmugam & Rishi Pugazhendhi & Rajvikram Madurai Elavarasan & Pitchandi Kasiviswanathan & Narottam Das, 2020. "Anti-Reflective Coating Materials: A Holistic Review from PV Perspective," Energies, MDPI, vol. 13(10), pages 1-93, May.

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