Enhancing Optical Repulsion in Nano-Dimers Through Tailored Background Media and Wave Engineering

The manipulation of optical forces at the nanoscale has significant implications for nanophotonics, optical trapping, and advanced material design. This study explores the enhancement of optical repulsion in nano-dimers by optimizing the surrounding background media and leveraging wave engineering techniques. By systematically tailoring the refractive index and electromagnetic properties of the medium, we demonstrate an increase in the repulsive optical forces between coupled nanoparticles. Additionally, we investigate the role of structured light fields, including phase and polarization engineering, in modulating these interactions. Our findings provide insights into the fundamental mechanisms governing optical repulsion and open new avenues for designing non-contact optical manipulation strategies with potential applications in optical tweezers, nanofabrication, and biomedical engineering.