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Related Experiment Video

Updated: Feb 10, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Ring quantum cascade lasers with twisted wavefronts.

Rolf Szedlak¹, Thomas Hisch², Benedikt Schwarz³

¹Institute of Solid State Electronics & Center for Micro- and Nanostructures, TU Wien, Floragasse 7, 1040, Vienna, Austria. rolf.szedlak@tuwien.ac.at.

Scientific Reports

|May 24, 2018

Summary

This summary is machine-generated.

Researchers generated twisted light beams using ring quantum cascade lasers and metamaterials. This method alters beam patterns and offers an alternative to exceptional point microlasers.

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Magnetic Tweezers for the Measurement of Twist and Torque

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Area of Science:

Optics and Photonics
Metamaterials
Semiconductor Lasers

Background:

Ring quantum cascade lasers are sources of coherent light.
Metamaterials offer unique light manipulation properties.
Twisted light beams possess orbital angular momentum.

Purpose of the Study:

To demonstrate on-chip generation of twisted light beams.
To investigate the influence of metamaterials on light wavefronts.
To explore an alternative to exceptional point microlasers.

Main Methods:

Fabrication of a monolithic gradient index metamaterial on a semiconductor chip.
Integration of the metamaterial with ring quantum cascade lasers.
Characterization of the generated light beam patterns.

Main Results:

Successfully generated twisted light beams on-chip.
Observed changes in beam patterns (intensity minimum to maximum) controlled by metamaterial discontinuity.
Demonstrated wavefront twisting induced by the gradient index metamaterial.

Conclusions:

On-chip generation of twisted light is feasible using quantum cascade lasers and metamaterials.
Metamaterial design offers control over beam characteristics.
This approach presents a novel alternative for microlaser applications.