Features of light absorption by spherical microcapsules with metal nanoinclusions
Yu.E. Geints, A.A. Zemlyanov, E.K. Panina
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: микрокапсула, наночастица, поглощение света, плазмонный резонанс, эффективная среда, microcapsule, nanoparticle, light absorption, plasmon resonance, effective medium
Abstract
The light absorption efficiency of a hollow spherical microparticle (microcapsule) doped with strongly absorbing gold nanoparticles of spherical and cylindrical spatial shapes is studied. By means of the FDTD numerical simulations, the absorption spectra of a doped microcapsule in the visible and near-IR spectral regions (from 0.5 to 0.9 mm) are calculated. It is found that the absorption efficiency of the capsule depends on the nanoinclusions morphology. In particular, there is a noticeable increase in capsule absorption in the regions of resonant excitation of surface plasmon modes of nanoparticles. The dispersion of absorption decreases with an increase in the volume content of nanoparticles in the microcapsule, as well as with the mixing of nanoinclusions of various shapes (spheres + rods). In this case, it becomes possible to obtain a capsule absorption spectrum close to uniform in the wavelength range under study.
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