Browsing by Author "MD. Fakrul Hassan"

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Open Access
    On Chip Optical Trapping and Sorting
    (North South University, 2019-05) Syeda Ramisa Masum; Muhammad Zayan Ahsan; Sayed Hasan Salim; MD. Fakrul Hassan; Dr. Mahdy Rahman Chowdhury; 1320584045; 1110905043; 1511806045; 1511034043
    In this paper we investigated the effects of Bessel Beam and plane wave separately on three different types of particle. Our research was mainly with particles of chiral, dielectric and plasmonic material on nanometer scale. The particles were observed to have exhibited different behavioral patterns under the effects of said waves when a slanted substrate was placed under each particle. The different behavior of particles were sufficient to sort these particles and also due to the slanted plasmonic sheet it was possible to trap certain types of particles. The incident light for both cases was projected from above with incident angle of 90 degrees. Our work accentuates the impact of tractor beam on optical chip thus sorting dipolar particles. Under the influence of plane wave, our study shows that all the particles behave similarly as all three di-pole objects are getting pulling force and therefore, they are being trapped. But for Bessel beam, which is a non-diffractive, high intensity light, with a cone angle of 20 degree and incident angle of 90 degree; the particles show different behavior. Chiral and Dielectric particles experiences pulling force therefore they are being trapped but plasmonic particle exerts pushing force. This phenomenon allows us to sort unknown particles. The inside physics can be defined with Poynting vector which represents the instantaneous power flow due to instantaneous electric and magnetic fields