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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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Published on: May 29, 2018

Electrically tunable diffraction of light from 2D nematic colloidal crystals.

M Humar¹, M Skarabot, M Ravnik

¹J. Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.

The European Physical Journal. E, Soft Matter

|February 21, 2009

Summary

This summary is machine-generated.

Researchers demonstrate electrical tuning of light diffraction in 2D dipolar nematic colloidal crystals. An applied electric field induces anisotropic strain, significantly altering inter-colloidal spacing for potential photonic applications.

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Area of Science:

Materials Science
Condensed Matter Physics
Optics

Background:

Colloidal crystals exhibit unique optical properties.
Dipolar nematic phases in 2D colloidal systems are of scientific interest.
Controlling these properties with external stimuli is crucial for applications.

Purpose of the Study:

To investigate the electrical tunability of visible light diffraction.
To explore the effect of electric fields on 2D dipolar nematic colloidal crystals.
To assess the potential for photonic applications.

Main Methods:

Fabrication of 2D dipolar nematic colloidal crystals.
Application of external electric fields perpendicular to the crystal plane.
Measurement of changes in inter-colloidal spacing via diffraction.

Main Results:

Electrical tuning of visible light diffraction was achieved.
An applied electric field (approx. 1 V/microm) induced highly anisotropic strain.
Inter-colloidal spacing changed by up to 20% in one direction and 2% in the perpendicular direction.

Conclusions:

A novel mechanism for electrical control of colloidal crystal structure was demonstrated.
The anisotropic strain response offers possibilities for tunable photonic devices.
Despite response times of several seconds, the findings suggest promising photonic applications.