Topological\nSlow Light Enabled Huge Optical Force Enhancement

Slow light effect has led to startling advances in enhancing\nthe optical force of objects. However, slow light means high group\nindex, and it becomes increasingly sensitive to environmental disturbances.\nEven weak disturbances can lead to significant backscattering, loss,\nand localization, which brings disaster to optical manipulation. Here,\nwe propose topological slow light to achieve optical force enhancement,\nwhere topological protection features are used to counter the effects\nof disturbances and defects, ensuring the particle moving along the\npre-established path over long range. Results show that the designed\ntopological structures support slow light modes with high group indices\nof nearly 3000. This results in an optical force amplification of\n13,010 times compared to the same object at the top of a traditional\nwaveguide. The method presented here provides an on-chip optical force\nenhancement scheme, paving the way for simultaneous and efficient\nmanipulation of multiple objects in on-chip optical systems.