2021/11/29 by Kiana Malmir, Malmir, Kiana, W. A. Okell +8
Engineering · Physics and Astronomy · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Mechanical and Optical Resonators #Microfluidic and Bio-sensing Technologies #Optics (physics.optics) #Orbital Angular Momentum in Optics #physics.flu-dyn #physics.optics
paper · pdf · doi:10.48550/arxiv.2111.14989
arxiv created 2021/11/29 · openalex publication_date 2021/11/29 · arxiv updated 2021/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We introduce a method for analyzing the physical properties of nanoparticles in fluids via the competition between viscous drag and optical forces. By flowing particles through a microfluidic device containing an optical microcavity which acts as a combined optical trap and sensor, the variation of the rate of trapping events with the different forces can be established. A clear threshold behaviour is observed which provides a measure of a parameter combining the dielectric polarizability and the hydrodynamic radius. This technique could be applied in combination with other analytic techniques to provide a detailed physical characterisation of particles in solution.