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On chip chiral and plasmonic hybrid dimer or tetramer:Generic way to reverse longitudinal and lateral optical binding forces

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Chinese Physics B 2022年第5期31卷 305-316页

作者： Sudipta Biswas roksana khanam rumi Tasnia Rahman Raima Saikat Chandra Das M R C Mahdy Department of Electrical&Computer Engineering North South UniversityBashundharaDhaka1229Bangladesh

For both the longitudinal binding force and the lateral binding force,a generic way of controlling the mutual attraction and repulsion(usually referred to as reversal of optical binding force)between chiral and plasmonic hybrid dimers or tetramers has not been reported so *** this paper,by using a simple plane wave and an onchip configuration,we propose a possible generic way to control the binding force for such hybrid objects in both the near-field region and the far-field *** also investigate different inter-particle distances while varying the wavelengths of light for each inter-particle distance throughout the *** of all,for the case of longitudinal binding force,we find that chiral-plasmonic hybrid dimer pairs do not exhibit any reversal of optical binding force in the near-field region nor in the far-field region when the wavelength of light is varied in an air ***,when the same hybrid system of nanoparticles is placed over a plasmonic substrate,a possible chip,it is possible to achieve a reversal of the longitudinal optical binding ***,for the case of lateral optical binding force,we investigate a setup where we place the chiral and plasmonic tetramers on a plasmonic substrate by using two chiral nanoparticles and two plasmonic nanoparticles,with the setup illuminated by a circularly polarized plane *** applying the left-handed and the right-handed circular polarization state of light,we also observe the near-field and the far-field reversal of lateral optical binding force for both *** far as we know,so far,no work has been reported in the literature on the generic way of reversing the longitudinal optical binding force and the lateral optical binding force of such hybrid *** a generic way of controlling optical binding forces can have important applications in different fields of science and technology in the near future.

关键词： longitudinal binding force plasmonics chirality optical force

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