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Nanoplasmonic structures: Designing electromagnetic fields

Nanoplasmonic structures: Designing electromagnetic fields. Benji Börner. Content. short revision Surface Plasmon Polariton (SPP) mathematical SPP excitation by electons SPP excitation by photons nanoplasmonic structures experimental applications. Revision.

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Nanoplasmonic structures: Designing electromagnetic fields

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  1. Nanoplasmonic structures: Designing electromagnetic fields Benji Börner

  2. Content • short revision • Surface Plasmon Polariton (SPP) mathematical • SPP excitation by electons • SPP excitation by photons • nanoplasmonic structures • experimental applications

  3. Revision • surfaceplasmons on metalsurface • coherentoscillationoffreeelectrons • canbeexcitedbyelectronsandphotons www.ucd.ie

  4. mathematical explanation – dispersion relation • boundary condition by Maxwell for em wave mysite.du.edu/~lconyers/SERDP/Figure5.htm

  5. mathematical explanation – dispersion relation

  6. mathematical explanation – dispersion relation real part imaginary part

  7. mathematical explanation – dispersion relation • damping due to ohmic losses and electron-core interactions • manifestation in imaginary part of dielectric function

  8. mathematical explanation • intensity decreased by absorption (E²) • propagation length: • intensity at distance x: • skin depth formula: http://erbium.ece.mcgill.ca/research/plasmonic-interconnects/

  9. SPP excitation by electrons • electron scattering on surface • parallel part creates surface plasmon polariton Yang Zhang et.al. “Edge scattering of surface plasmons excited by scanning tunneling microscopy”, Maier - Plasmonics

  10. SPP excitation by photons • need to match wavelength and momentum • tools like prisms or gratings needed http://pjmedia.com/lifestyle/files/2013/07/Dispersion_prism.jpg

  11. SPP excitation by photons - prism • prism in Kretschmann configuration • different dielectric functions match momentum • evanescent wave excites SPP Google.de -> Kretschmann configuration

  12. SPP excitation by photons - prism • prism in Otto configuration • SPP excited on top of metal film http://skullsinthestars.com/2010/09/21/optics-basics-surface-plasmons/ Minghui Hong et.al „ Masklessmultibeam laserirradiationenables large-area nanostructurefabrication“

  13. SPP excitation by photons - grating • excitation with grating • reciprocal grating vector gives imaginary part ByounghoLee et.al. „Shaping and focusing light beams with plasmonics”

  14. SPP excitation • SPP scatter on defects • defects provide free space radiation http://www.westga.edu/~chem/facultydocs/stuart.htm

  15. nanoplasmonic structures – gratings YongqiFu et. al. “Plasmonic Lenses”

  16. nanoplasmonic structures – flat gratings http://www.cs.huji.ac.il/~ulevy/facil.php

  17. nanoplasmonic structures – concave gratings ByounghoLee et.al. „Shaping and focusing light beams with plasmonics“

  18. nanoplasmonic structures – concentric gratings YongqiFu et. al. “Plasmonic Lenses”

  19. nanoplasmonic structures – nanoholes CarstenSönnichsen “Plasmons in metal nanostructures” Maier - Plasmonics

  20. experimental applications • investigation of surfaces to find defects • identify density changes • molecular detectors

  21. Thank you!

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