title: Hyperspectral dark-field microscopy of gold nanodisks.
abstract: The light scattering properties of hexagonal and triangular gold nanodisks were investigated by means of Cytoviva hyperspectral dark-field microscopy, exploring the huge enhancement of the scattered waves associated with the surface plasmon resonance (SPR) effect. Thanks to the high resolution capability of the dark-field microscope, the SPR effect turned it possible to probe the individual nanoparticles directly from their hyperspectral images, extrapolating the classical optical resolution limit, and providing their corresponding extinction spectra. Blue spectral shifts involving the in-plane dipolar modes were observed for the hexagonal gold nanodisks in relation to the triangular ones, allowing their spectroscopic differentiation in the dark-field images.
authors.affiliation: Instituto de Química, Universidade de São Paulo, Zip Code 26077, CEP 05513-970, São Paulo, Brazil.
authors.forename: Daniel
authors.initials: D
authors.lastname: Grasseschi
authors.affiliation: Instituto de Química, Universidade de São Paulo, Zip Code 26077, CEP 05513-970, São Paulo, Brazil.
authors.forename: Filipe S
authors.initials: FS
authors.lastname: Lima
authors.affiliation: Instituto de Química, Universidade de São Paulo, Zip Code 26077, CEP 05513-970, São Paulo, Brazil.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Nakamura
authors.affiliation: Instituto de Química, Universidade de São Paulo, Zip Code 26077, CEP 05513-970, São Paulo, Brazil. Electronic address: henetoma@iq.usp.br.
authors.forename: Henrique E
authors.initials: HE
authors.lastname: Toma
keywords: Cytoviva microscopy; Dark-field microscopy; Gold nanodisks; Hyperspectral microscopy; SPR