Giant enhancement of elastic plasmon-polaritons scattering by nanosized objects
Mercredi 1er juin 2011
à 11h en salle C. Brot
Excitation of Surface plasmon-polaritons (SPPs) is powerful base for constructing sensible sensors for different applications. Elastic SPPs scattering opens new possibilities to detect reactions with and biointegrated nanomaterials and nanostructures based on them.
In this communication it was experimentally observed extremely high polarization enhancement factor due to elastic surface plasmon-polariton scattering by nanosized surface objects. We have observed strong diffraction of surface plasmon-polaritons by shallow diffraction grating of few grooves, while its illumination by evanescent or volume waves do not shows any traces of diffraction structure in space distribution of scattered light. Estimation of enhancement factor for such a system shows value in order of 10^4 – 10^6.
SPPs scattering by similar diffraction grating with period of 2.5 micrometers shows as well very high enhancement factor, which in this case can be measured. It was obtained that enhancement value is in order of 25 000.
Some theoretical calculations will be compared with experimental data
Such a significant enhancement can be used to detect very small changes of surface properties related to weak traces of the reactions with bioinspired and biointegrated nanomaterials.
Voir en ligne : Institute of Semiconductor Physics NAS of Ukraine,
Fluides & Matériaux Complexes
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