Optical tweezers with enhanced efficiency based on laser-structured substrates
arXiv:1211.3104 · doi:10.1063/1.4728992
Abstract
We present an optical nanotrapping setup that exhibits enhanced efficiency, based on localized plasmonic fields around sharp metallic features. The substrates consist of laser-structured silicon wafers with quasi-ordered microspikes on the surface, coated with a thin silver layer. The resulting optical traps show orders of magnitude enhancement of the trapping force and the effective quality factor.