25 citations · 67 across the 4 of their papers we have counts for
4 papers
Germanium microparticles as optically induced oscillators in optical tweezers
W. H. Campos, T. A. Moura, O. J. B. J. Marques +4
Oscillatory dynamics is a key tool in optical tweezers applications. It is usually implemented by mechanical interventions that cannot be optically controlled. In this work we show…
How light absorption modifies the radiative force on a microparticle in optical tweezers
W. H. Campos, J. M. Fonseca, J. B. S. Mendes +2
Reflection and refraction of light can be used to trap small dielectric particles in the geometrical optics regime. Absorption of light is usually neglected in theoretical calculat…
Topological insulator particles as optically induced oscillators: towards dynamical force measurements and optical rheology
W. H. Campos, J. M. Fonseca, V. E. de Carvalho +3
We report the first experimental study upon the optical trapping and manipulation of topological insulator (TI) particles. By virtue of the unique TI properties, which have a condu…
Geometrically induced reversion of Hall current in a topological insulator cavity
Warlley H. Campos, Winder A. Moura-Melo, Jakson M. Fonseca
An electric charge near the surface of a topological insulator induces an image magnetic monopole. Here, we show that if the topological insulator surface has a negative curvature,…