Optical absorption manipulation of spherical microcapsules mediated by buffer nanoparticles
Yu.E. Geints, E.K. Panina
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: microcapsule, absorbing nanoparticle, FDTD-calculations, microcapsule, absorbing nanoparticle, FDTD-calculations
Abstract
Using numerical finite-difference time-domain (FDTD) calculations, we simulate and examine the absorption dynamics of the near-infrared optical radiation in a spherical microcapsule surrounded by solid nanoparticles of different optical properties (metal, biocompatible dielectric). A model microcapsule resembles a microcontainer used in modern bio- and medical technologies for targeted delivery of therapeutic nanodoses of drugs to the desired region of the biological tissues. We show that due to light scattering on nanoparticles, the optical field superlocalization in the "hot regions" on the microcapsule surface take place. The three-fold light absorption enhancement can be achieved due to the addition of buffer nanoparticles.
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