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Multilayer microparticles with a liquid core and a polycompositelight-absorbing shell are important components of modern bio- and medicaltechnologies, in particular, as transport microcontainers in the system oftargeted delivery of therapeutic nanodoses to the desired region of thebiological tissues. For reliably opening the microcapsule shell by an opticalradiation and releasing the payload, it is necessary to dramatically increasethe light absorption of such a microcontainer. To this end, we proposesurrounding the microcapsule with specially added auxiliary nanoparticles,which can accumulate optical energy near its surface and direct a concentratedphotonic flux to the target microcapsule thus leading to its booster heating.Using numerical finite-difference time-domain (FDTD) calculations, we simulateand examine the absorption dynamics of the near-infrared optical radiation in aspherical microcapsule surrounded by solid nanoparticles of different opticalproperties (metal, biocompatible dielectric). We show that due to lightscattering on nanoparticles, the optical field superlocalization in the "hotregions" on the microcapsule surface occurs. The three-fold light absorptionenhancement can be achieved due to the addition of nanoparticles.

Boosting Light Absorption of a Therapeutic Microcapsule by Means of Auxiliary Solid Nanoparticles