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Related Experiment Video

Updated: May 25, 2026

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Directed assembly of optically bound matter.

Michael D Summers¹, Richard D Dear, Jonathan M Taylor

¹Department of Chemistry, PTCL, University of Oxford, Oxford, UK.

|January 26, 2012

Summary

This summary is machine-generated.

Researchers studied optically bound matter formation using evanescent fields and optical tweezers. They observed a microscopic Newton

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Area of Science:

Optics and Photonics
Soft Matter Physics
Nanotechnology

Background:

Optically bound matter formation is crucial for micro-assembly.
Evanescent fields offer unique optical forces for particle manipulation.

Purpose of the Study:

To investigate optically bound matter formation in counter-propagating evanescent fields.
To analyze the structures and dynamics of optically bound colloidal chains.

Main Methods:

Utilizing total internal reflection on a prism surface.
Employing optical tweezers for controlled assembly of silica microspheres.
Simulating structures and dynamics with generalized Lorentz-Mie theory.

Main Results:

Observed controlled assembly of small silica microsphere ensembles.
Demonstrated enhancement of scattering force along the propagation direction.
Identified a microscopic analogue of a driven pendulum, resembling Newton's cradle.

Conclusions:

Evanescent fields enable controlled formation of optically bound colloidal chains.
The observed phenomena provide insights into light-matter interactions at the microscale.