Optically Controlled Thermohyrodynamic Trapping of Single Nanoparticles

Martin Fränzl; Frank Cichos

doi:10.1117/12.2633324

3 October 2022 Optically Controlled Thermohyrodynamic Trapping of Single Nanoparticles

Martin Fränzl, Frank Cichos

Proceedings Volume PC12198, Optical Trapping and Optical Micromanipulation XIX; PC1219814 (2022) https://doi.org/10.1117/12.2633324
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

The manipulation of micro- and nano-objects is of great technological significance to construct new materials, manipulate tiny amounts of liquids in fluidic systems, or detect minute concentrations of analytes. It is commonly approached by the generation of potential energy landscapes, for example, with optical fields. Here we show that strong hydrodynamic boundary flows enable the trapping and manipulation of nano-objects near surfaces. These thermo-osmotic flows are induced by modulating the van der Waals interaction at a solid-liquid interface with optically induced temperature fields. We use a thin gold film on a glass substrate to provide localized but reconfigurable point-like optical heating. Convergent boundary flows with velocities of tens of micrometres per second are observed and substantiated by a quantitative physical model. The hydrodynamic forces acting on suspended nanoparticles and attractive van der Waals or depletion induced forces enable precise positioning and guiding of the nanoparticles. Fast multiplexing of flow fields further provides the means for parallel manipulation of many nano-objects. Our findings have direct consequences for the field of plasmonic nano-tweezers as well as other thermo-plasmonic trapping schemes and pave the way for a general scheme of nanoscopic manipulation with boundary flows. [1] Fränzl, M. & Cichos, F. Hydrodynamic manipulation of nano-objects by optically induced thermo-osmotic flows. Nat Commun 13, 656 (2022).

Conference Presentation

Citation Download Citation

Martin Fränzl and Frank Cichos "Optically Controlled Thermohyrodynamic Trapping of Single Nanoparticles", Proc. SPIE PC12198, Optical Trapping and Optical Micromanipulation XIX, PC1219814 (3 October 2022); https://doi.org/10.1117/12.2633324

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available