Electromagnetic Hyper-Lift: optical nano-tweezers with hyperbolic materials

TL;DR

This paper introduces electromagnetic hyper-lift, a novel optical nano-tweezing technique using hyperbolic materials that surpasses traditional optical tweezers in resolution and force efficiency due to hyperbolic media's unique auto-focusing properties.

Contribution

The study demonstrates how hyperbolic materials enable nanometer-precision control and significantly stronger forces in optical trapping, overcoming diffraction limits of conventional tweezers.

Findings

Hyperbolic materials enable auto-focusing for precise spatial control.

Electromagnetic forces exceed conventional optical tweezers by several orders.

Enhanced particle manipulation at lower illumination intensities.

Abstract

Optical tweezers, formed by tightly focused propagating laser beams, offer the unique capability to trap and control microscopic particles over a broad size range. However, the diffraction inherent to propagating optical fields, limits the resulting resolution and the accuracy of particle manipulation. Here we show that the phenomenon of ``auto-focusing'' inherent to hyperbolic materials in cylinder geometry, can be used for spatial control with nanometer accuracy. Furthermore, due to highly efficient light focusing in hyperbolic media that is not restricted by diffraction, the resulting electromagnetically induced forces exceed those of conventional optical tweezers by several orders of magnitude, which allows more efficient particle manipulation at reduced illumination intensity.