Polarization Dependent Optical Binding Force Between Plasmonic, Dielectric Homodimer and Hybrid dimer

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2020
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Controlling the optical binding force in the near field is a relatively new area of optical manipulation. There is no specific method for plasmonic or dielectric nano-dimers to control the optical binding force by varying the angle of the light. In this report, we have demonstrated an optical setup that, it’s possible to control the optical binding force by changing the polarization where we varied the angle of the light from 0-180 degree. Also, we have shown a potential optical system lit by a linearly polarized plane wave in this work. For setup, plasmonic- plasmonic homodimer over a dielectric (glass) substrate, where we could control the optical binding force in the near field region by changing the polarization. At first, by varying the angle of the light (from 0-180 degree), we have shown that the optical binding force can’t be controlled for either the dielectric homodimer set, plasmonic homodimer set or the plasmonic and dielectric hybrid dimer set. After that, we have changed the polarization of the light for all sets. Surprisingly, only for the plasmonic-plasmonic homodimer set, we found a strong attractive force (for X polarization) and repulsive force (for Y polarization). These attractive and repulsive forces are occurring due to the Coulomb charge theory.
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Electrical and Computer Engineering
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North South University
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