17
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: not found
      • Article: not found

      Optical Properties of Hybrid Organic-Inorganic Materials and their Applications

      Read this article at

      ScienceOpenPublisher
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Related collections

          Most cited references466

          • Record: found
          • Abstract: not found
          • Book: not found

          Principles of Fluorescence Spectroscopy

            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Calculated absorption and scattering properties of gold nanoparticles of different size, shape, and composition: applications in biological imaging and biomedicine.

            The selection of nanoparticles for achieving efficient contrast for biological and cell imaging applications, as well as for photothermal therapeutic applications, is based on the optical properties of the nanoparticles. We use Mie theory and discrete dipole approximation method to calculate absorption and scattering efficiencies and optical resonance wavelengths for three commonly used classes of nanoparticles: gold nanospheres, silica-gold nanoshells, and gold nanorods. The calculated spectra clearly reflect the well-known dependence of nanoparticle optical properties viz. the resonance wavelength, the extinction cross-section, and the ratio of scattering to absorption, on the nanoparticle dimensions. A systematic quantitative study of the various trends is presented. By increasing the size of gold nanospheres from 20 to 80 nm, the magnitude of extinction as well as the relative contribution of scattering to the extinction rapidly increases. Gold nanospheres in the size range commonly employed ( approximately 40 nm) show an absorption cross-section 5 orders higher than conventional absorbing dyes, while the magnitude of light scattering by 80-nm gold nanospheres is 5 orders higher than the light emission from strongly fluorescing dyes. The variation in the plasmon wavelength maximum of nanospheres, i.e., from approximately 520 to 550 nm, is however too limited to be useful for in vivo applications. Gold nanoshells are found to have optical cross-sections comparable to and even higher than the nanospheres. Additionally, their optical resonances lie favorably in the near-infrared region. The resonance wavelength can be rapidly increased by either increasing the total nanoshell size or increasing the ratio of the core-to-shell radius. The total extinction of nanoshells shows a linear dependence on their total size, however, it is independent of the core/shell radius ratio. The relative scattering contribution to the extinction can be rapidly increased by increasing the nanoshell size or decreasing the ratio of the core/shell radius. Gold nanorods show optical cross-sections comparable to nanospheres and nanoshells, however, at much smaller effective size. Their optical resonance can be linearly tuned across the near-infrared region by changing either the effective size or the aspect ratio of the nanorods. The total extinction as well as the relative scattering contribution increases rapidly with the effective size, however, they are independent of the aspect ratio. To compare the effectiveness of nanoparticles of different sizes for real biomedical applications, size-normalized optical cross-sections or per micron coefficients are calculated. Gold nanorods show per micron absorption and scattering coefficients that are an order of magnitude higher than those for nanoshells and nanospheres. While nanorods with a higher aspect ratio along with a smaller effective radius are the best photoabsorbing nanoparticles, the highest scattering contrast for imaging applications is obtained from nanorods of high aspect ratio with a larger effective radius.
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Nonlinear plasmonics

                Bookmark

                Author and article information

                Journal
                Advanced Functional Materials
                Adv. Funct. Mater.
                Wiley
                1616301X
                September 2016
                September 2016
                August 22 2016
                : 26
                : 36
                : 6506-6544
                Affiliations
                [1 ]Laboratoire de Chimie ENS Lyon; Université de Lyon; Ecole Normale Supérieure de Lyon; Université Lyon 1; CNRS UMR 5182, 46 allée d'Italie 69364 Lyon France
                [2 ]Institute of Advanced Materials; Universitat Jaume I; Castellón de La Plana 12071 Spain
                [3 ]Univ Aveiro; Dept Phys; P-3810193 Aveiro Portugal
                [4 ]Univ Aveiro; CICECO - Aveiro Institute of Materials; P-3810193 Aveiro Portugal
                [5 ]Collège de France; UPMC Univ Paris 06; Laboratoire de Chimie de la Matière Condensée de Paris (CMCP UMR 7574); 11 place Marcelin Berthelot F-75005 Paris France
                Article
                10.1002/adfm.201602730
                800fe2a9-24d6-4cc8-853e-e43168000782
                © 2016

                http://doi.wiley.com/10.1002/tdm_license_1.1

                History

                Comments

                Comment on this article