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Updated: Jan 11, 2026
08:19
Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
2.7K
Optical levitation of Janus particles within focused cylindrical vector beams
Alessandro Magazzù1, Iryna Kasianiuk2,3, Denis Kasyanyuk2,3
1CNR-IPCF, Istituto per i Processi Chimico-Fisici, I-98158, Messina, Italy.
Nanophotonics (Berlin, Germany)
|November 17, 2025
Summary
Researchers developed a new method for precisely controlling Janus particles using light. This technique offers advanced manipulation for nanotechnology and biophysics applications.
Area of Science:
- Optical manipulation
- Nanotechnology
- Biophysics
Background:
- Janus particles are of interest for microengines and drug delivery.
- Current manipulation methods rely on chemical reactions or thermal gradients, limiting precision.
Purpose of the Study:
- To propose and investigate a novel 3D manipulation technique for Janus particles using focused cylindrical vector beams.
- To overcome limitations of existing methods by enabling precise control.
Main Methods:
- Utilized focused cylindrical vector beams with a doughnut-shaped intensity profile.
- Studied the behavior, orientation, and manipulation of silica and polystyrene Janus particles with gold caps.
- Exploited optical potentials and radiation pressure acting on the gold cap.
Main Results:
- Demonstrated 3D manipulation and precise control of Janus particles.
- Showcased the technique's effectiveness on highly reflective Janus particles.
- Confirmed radiation pressure predominantly affects the gold cap.
Conclusions:
- The proposed levitation technique offers precise control over Janus particles.
- This method has potential for manipulating various Janus particles and complex reflective objects.
- Enables advanced applications in nanotechnology and biophysics.
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