6 papers
Optical forces on an oscillating dipole near VO phase transition
Daniela Szilard, Patrícia P. Abrantes, Felipe A. Pinheiro +3
We investigate optical forces on oscillating dipoles close to a phase-change vanadium dioxide (VO) film, which exhibits a metal-insulator transition around K and low ther…
Probing the screening of the Casimir interaction with optical tweezers
L. B. Pires, D. S. Ether, B. Spreng +13
We measure the colloidal interaction between two silica microspheres in aqueous solution in the distance range from m to m with the help of optical tweezers. When e…
Theory of optical tweezing of dielectric microspheres in chiral host media and its applications
Rfaqat Ali, R. S. Dutra, F. A. Pinheiro +2
We report for the first time the theory of optical tweezers of spherical dielectric particles embedded in a chiral medium. We develop a partial-wave (Mie) expansion to calculate th…
Enantioselective manipulation of chiral nanoparticles using optical tweezers
R. Ali, F. A. Pinheiro, F. S. S. Rosa +2
We put forward an enantioselective method for chiral nanoparticles using optical tweezers. We demonstrate that the optical trapping force in a typical, realistic optical tweezing s…
Optimizing optical tweezing with directional scattering in composite microspheres
R. Ali, F. A. Pinheiro, F. S. S. Rosa +2
Trapping of microspheres with a single focused laser beam is usually limited to materials with relative refractive indexes slightly larger than one. We show that directional light…
Rigorous analysis of Casimir and van der Waals forces on a silicon nano-optomechanical device actuated by optical forces
Janderson R. Rodrigues, Andre Gusso, Felipe S. S. Rosa +1
In this article, we rigorously analyze the effects of the dispersion forces (Casimir and van der Waals forces) on a nano-optomechanical device based on a silicon waveguide and a si…