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Nanoplasmonic structures: Designing electromagnetic fields

This comprehensive guide delves into the design and applications of nanoplasmonic structures, focusing on Surface Plasmon Polaritons (SPP). The content covers mathematical explanations, SPP excitation by electrons and photons, dispersion relations, and experimental applications. Learn about coherent electron oscillations, damping effects, SPP excitation mechanisms, and how defects in structures can impact radiation patterns. Discover the potential of nanoplasmonic gratings, lenses, and nanostructures in various applications such as molecular detection and surface defect analysis. Dive into the realm of nanophotonics and unlock the capabilities of manipulating electromagnetic fields at the nanoscale level for cutting-edge innovations.

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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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