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Microsphere Assisted Super-resolution Optical Imaging of Plasmonic Interaction between Gold Nanoparticles

Conventional far-field microscopy cannot directly resolve the sub-diffraction spatial distribution of localized surface plasmons in metal nanostructures. Using BaTiO(3) microspheres as far-field superlenses by collecting the near-field signal, we can map the origin of enhanced two-photon photolumine...

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Detalles Bibliográficos
Autores principales: Hou, Beibei, Xie, Mengran, He, Ruoyu, Ji, Minbiao, Trummer, Sonja, Fink, Rainer H., Zhang, Luning
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5653755/
https://www.ncbi.nlm.nih.gov/pubmed/29062012
http://dx.doi.org/10.1038/s41598-017-14193-3
Descripción
Sumario:Conventional far-field microscopy cannot directly resolve the sub-diffraction spatial distribution of localized surface plasmons in metal nanostructures. Using BaTiO(3) microspheres as far-field superlenses by collecting the near-field signal, we can map the origin of enhanced two-photon photoluminescence signal from the gap region of gold nanosphere dimers and gold nanorod dimers beyond the diffraction limit, on a conventional far-field microscope. As the angle θ between dimer’s structural axis and laser polarisation changes, photoluminescence intensity varies with a cos(4)θ function, which agrees quantitatively with numerical simulations. An optical resolution of about λ/7 (λ: two-photon luminescence central wavelength) is demonstrated at dimer’s gap region.