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Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

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3D microlasers from self-assembled cholesteric liquid-crystal microdroplets.

M Humar¹, I Musevic

¹J. Stefan Institute, Ljubljana, Slovenia.

|January 4, 2011

Summary

This summary is machine-generated.

Researchers created tunable, omnidirectional microlasers using dye-doped liquid crystals. These microdroplet lasers offer a simple method for producing millions of photonic devices for soft-matter applications.

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Area of Science:

Photonics
Materials Science
Optics

Background:

Cholesteric liquid crystals exhibit unique optical properties due to their helical structure.
Microcavities are essential for laser operation, confining light to enhance stimulated emission.
Developing efficient and tunable microlasers is crucial for advanced photonic devices.

Purpose of the Study:

To demonstrate a novel tunable and omnidirectional microlaser.
To utilize a dye-doped cholesteric liquid crystal microdroplet as an optical microcavity.
To explore the potential of these microlasers for soft-matter photonic applications.

Main Methods:

Formation of microdroplets containing dye-doped cholesteric liquid crystal in a carrier fluid.
Utilizing the cholesteric liquid crystal's Bragg-onion structure as a 3D optical microcavity.
Stimulated emission from dye molecules within the liquid crystal host.

Main Results:

Achieved tunable and omnidirectional lasing from the microdroplet system.
Demonstrated that the lasing wavelength is dependent on the cholesteric's helical period.
Showcased temperature-tunability of the lasing wavelength.
Successfully produced millions of microlasers through simple mixing.

Conclusions:

A novel, tunable, and omnidirectional microlaser based on liquid crystal microdroplets has been successfully demonstrated.
The Bragg-onion optical microcavity within the microdroplet enables efficient 3D lasing.
This method provides a scalable approach for fabricating microlasers for soft-matter photonic devices.