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Omnidirectional Gradient Force Optical Trapping in Dielectric Nanocavities by Inverse Design by Jokisch, Beñat Martinez de Aguirre; Gøtzsche, Benjamin Falkenberg; Kristensen, Philip Trøst; Wubs, Martijn; Sigmund, Ole; Christiansen, Rasmus Ellebæk is a scholarly article available to read on EtoBox.

What is Omnidirectional Gradient Force Optical Trapping in Dielectric Nanocavities by Inverse Design about?

Optical trapping enables precise control of individual particles of different sizes, such as atoms, molecules, or nanospheres. Optical tweezers provide free-space omnidirectional optical trapping of objects in laboratories around the world. As an alternative to standard macroscopic setups based on lenses, which are inherently bound by the diffraction limit, plasmonic and photonic nanostructures promise trapping by near-field optical effects on the extreme nanoscale. However, the practical design of lossless waveguide-coupled nanostructures capable of trapping sub-wavelength-sized particles in all spatial directions has until now proven insurmountable. In this work, we demonstrate an omnidirectional optical trap realized by inverse-designing fabrication-ready integrated dielectric nanocavities. The sub-wavelength optical trap is designed to rely solely on the gradient force and is thus particle-size agnostic. In particular, we show how a trapped particle with a radius of 15 nm experiences a force strong enough to overcome room-temperature thermal fluctuations. Furthermore, through the robust inverse design framework, we tailor manufacturable devices operating at short-wave infrared

Author

Jokisch, Beñat Martinez de Aguirre; Gøtzsche, Benjamin Falkenberg; Kristensen, Philip Trøst; Wubs, Martijn; Sigmund, Ole; Christiansen, Rasmus Ellebæk

Published

2024

Language

EN