Now showing items 1-9 of 9

    • Brownian Motion in a Speckle Light Field: Tunable Anomalous Diffusion and Selective Optical Manipulation 

      Volpe G.; Volpe G.; Gigan, S. (2014)
      The motion of particles in random potentials occurs in several natural phenomena ranging from the mobility of organelles within a biological cell to the diffusion of stars within a galaxy. A Brownian particle moving in the ...
    • Controlling active brownian particles in complex settings 

      Velu, Sabareesh K. P.; Pinçe, Erçağ; Callegari, Agnese; Elahi, Parviz; Gigan, S.; Volpe, Giovanni; Volpe, G. (OSA, 2017)
      We show active Brownian particles (passive Brownian particles in a bacterial bath) switches between two long-term behaviors, i.e. gathering and dispersal of individuals, in response to the statistical properties of the ...
    • Disorder-mediated crowd control in an active matter system 

      Pinçe, E.; Velu, S. K. P.; Callegari, A.; Elahi, P.; Gigan, S.; Volpe, G.; Volpe, G. (Nature Publishing Group, 2016)
      Living active matter systems such as bacterial colonies, schools of fish and human crowds, display a wealth of emerging collective and dynamic behaviours as a result of far-from-equilibrium interactions. The dynamics of ...
    • Engineering particle trajectories in microfluidic flows using speckle light fields 

      Volpe, G.; Volpe, Giovanni; Gigan, S. (SPIE, 2014)
      Optical tweezers have been widely used in physics, chemistry and biology to manipulate and trap microscopic and nanoscopic objects. Current optical trapping techniques rely on carefully engineered setups to manipulate ...
    • Optical manipulation with random light fields: from fundamental physics to applications 

      Volpe, G.; Gigan, S.; Volpe, Giovanni (OSA, 2015)
      Speckles are random light fields that share some universal statistical properties. Because of this, they can be used to perform deterministic optical manipulation tasks on a Brownian particle as well as control its diffusion ...
    • Simulation of active Brownian particles in optical potentials 

      Volpe, G.; Gigan, S.; Volpe, Giovanni (SPIE, 2014)
      Optical forces can affect the motion of a Brownian particle. For example, optical tweezers use optical forces to trap a particle at a desirable position. Unlike passive Brownian particles, active Brownian particles, also ...
    • Simulation of the active brownian motion of a microswimmer 

      Volpe, G.; Gigan, S.; Volpe, G. (American Association of Physics Teachers, 2014)
      Unlike passive Brownian particles, active Brownian particles, also known as microswimmers, propel themselves with directed motion and thus drive themselves out of equilibrium. Understanding their motion can provide insight ...
    • Speckle optical tweezers: micromanipulation with random light fields 

      Volpe, G.; Kurtz, L.; Callegari, A.; Volpe, G.; Gigan, S. (Optical Society of America, 2014-07-18)
      Current optical manipulation techniques rely on carefully engineered setups and samples. Although similar conditions are routinely met in research laboratories, it is still a challenge to manipulate microparticles when the ...
    • Step-by-step guide to the realization of advanced optical tweezers 

      Pesce, G.; Volpe, G.; Marago, M. O.; Jones, H. P.; Gigan, S.; Sasso, A.; Volpe, G. (Optical Society of America, 2015-05-05)
      ince the pioneering work of Arthur Ashkin, optical tweezers (OT) have become an indispensable tool for contactless manipulation of micro- and nanoparticles. Nowadays OT are employed in a myriad of applications demonstrating ...