Browsing by Author "1620306043"

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    Dielectric and Plasmonic Dimers: Broadband Reversal of Optical Binding Force
    (North South University, 2020) Mahadul Islam; Mizanur Rahman; Mahdy Rahman Chowdhury; 1620871043; 1620306043
    The controlled broadband reversal of optical binding force is one of the latest and most promising areas of optical manipulation. Hardly any work has been done to control broadband reversal of the optical binding force of two heterodimers. Until now, optical manipulation has been used to find the reversal at the far-field optical binding force for plasmonic homodimers only. The behavior between the dielectric-plasmonic nanoparticles and their optical binding force in near and far fields has not been investigated in the literature yet, as the regulation of optical binding force by using only light in both far field and near field is a completely unexplored area. In this article, we have shown a very simple way of controlling the broadband reversal of optical binding force in both near field and far field for dielectric and plasmonic heterodimers. Through five different setups, we have shown that strong and stable reversal can be achieved for the near-field binding force for the dielectric-plasmonic heterodimers only if we put them on a substrate made of plasmonic material in an inhomogeneous background (air). This kind of reversal of binding force for dielectric-plasmonic heterodimers has been demonstrated based on the change in electric field and dipolar theory. Thus, we have proposed two generic ways to achieve strong reversal of optical binding force for dielectric-plasmonic heterodimers on a plasmonic-made substrate, where we can control the mutual attraction and repulsion by varying the wavelengths only. Keywords - broadband reversal, optical manipulation, dielectric, plasmonic, heterodimers, dipolar theory.