All-dielectric Nanoantenna for Low Power Optical Trapping of Nanoscale Objects with Ultra-low Heat Generation

Abstract

We report a dielectric nanoantenna system for the low-power optical trapping of nanoscale objects with ultra-low photothermal heating effect and enhanced trapping stability.

Anapole-Assisted Low-Power Optical Trapping of Nanoscale Extracellular Vesicles and Particles

“…We note that optical anapoles are actively investigated for optoelectronic applications such as anapole lasers and for second-harmonic generation due to their highly enhanced fields. While near-field optical trapping using anapole states have been theoretically proposed by us and others, no experimental demonstration has been reported to date. − The electromagnetic energy inside the anapole disk is not accessible because most of the light field is trapped within the dielectric nanodisk antenna supporting the anapole states. To make the field accessible to nearby biological molecules for near-field trapping, we introduced a double-nanohole slot at the center of the anapole disk.…”