70 citations · 121 across the 8 of their papers we have counts for
8 papers
Enantioselective optical trapping and characterization of all dielectric disorder-enabled chiral particles
Guilherme T. Moura, Tanja Schoger, Kainã G. Diniz +9
We trap submicroscopic silica spheres coated with randomly distributed titanium dioxide nanoparticles in optical tweezers with Laguerre-Gaussian modes and observe orbital dynamics…
Circular Dichroism without absorption in isolated chiral dielectric Mie particles
Rafael S. Dutra, Felipe A. Pinheiro, Diney S. Ether +3
We demonstrate that an effect phenomenologically analogous to circular dichroism can arise even for dielectric and isotropic chiral spherical particles. By analyzing the polarimetr…
Precise in situ radius measurement of individual optically trapped microspheres using negative optical torque exerted by focused vortex beams
Kainã Diniz, Tanja Schoger, Guilherme T. Moura +6
We demonstrate a new method for determining the radius of micron-sized particles trapped by a vortex laser beam. The technique is based on measuring the rotation experienced by the…
Tailoring bistability in optical tweezers with vortex beams and spherical aberration
Arthur Luna da Fonseca, Kainã Diniz, Paula Borges Monteiro +7
We demonstrate a bistable optical trap by tightly focusing a vortex laser beam. The optical potential has the form of a Mexican hat with an additional minimum at the center. The bi…
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…
Weighing an optically trapped microsphere in thermal equilibrium with air
L. E. Hillberry, Y. Xu, S. Miki-Silva +5
We report a weighing metrology experiment of a single silica microsphere optically trapped and immersed in air. Based on fluctuations about thermal equilibrium, three different mas…
Double-layer force suppression between charged microspheres
D. S. Ether, F. S. S. Rosa, D. M. Tibaduiza +3
In this paper we propose a protocol to suppress double-layer forces between two microspheres immersed in a dielectric medium, being one microsphere metallic at a controlled potenti…
Probing the Casimir force with optical tweezers
D. S. Ether, L. B. Pires, S. Umrath +10
We propose to use optical tweezers to probe the Casimir interaction between microspheres inside a liquid medium for geometric aspect ratios far beyond the validity of the widely em…