ИСТИНА

Bloch surface waves (BSWs) are propagating modes supported by all-dielectric multilayer structures with the energy concentrated at the surface. The field of these modes penetrates into the surrounding medium, which makes it possible to use them for optical manipulation of micro- and nanoparticles. In this talk, I will review our experimental studies of optical forces induced by BSWs in dielectric multilayers and discuss their potential for optomechanical applications. We started with a single polystyrene microparticle in water and showed that it can be trapped in the BSW evanescent field and propelled in the direction of the BSW propagation. The forces acting on such a particle were measured using photonic force microscopy. Then, we replaced single microbeads with a concentrated suspension of 50-nm dielectric particles. This made it possible to observe nonlinear self-action of BSWs governed by the optically induced spatial redistribution of particles. Finally, we explore the possibility of tailoring the BSW field using prefabricated dielectric structures on the surface of the multilayers. This could make BSWs a promising platform suitable for trapping, sorting, and transport of particles in microfluidic environment.