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Related Experiment Video

Updated: Jun 23, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Observation of topological frequency combs.

Christopher J Flower¹, Mahmoud Jalali Mehrabad¹, Lida Xu¹

¹Joint Quantum Institute, National Institute of Standards and Technology, University of Maryland, College Park, MD, USA.

Science (New York, N.Y.)

|June 20, 2024

Summary

This summary is machine-generated.

Researchers created novel topological frequency combs on a chip using a lattice of ring resonators. This new method generates combs confined to the lattice edge, opening new avenues in nanophotonics.

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Area of Science:

Photonics
Topological Physics
Nonlinear Optics

Background:

On-chip optical frequency combs are typically generated using single-ring resonators.
Existing methods have limitations, restricting broader applications of frequency combs.
Mode-locked lasers were previously required for many frequency comb applications.

Purpose of the Study:

To experimentally demonstrate a new class of frequency combs: topological frequency combs.
To explore nonlinear frequency comb generation in a topological system.
To investigate combs generated in a two-dimensional lattice of ring resonators.

Main Methods:

Fabrication of a two-dimensional lattice of hundreds of ring resonators.
Excitation of fabrication-robust topological edge states with linear dispersion.
Pumping these topological edge states to generate frequency combs.

Main Results:

Demonstration of nested frequency comb generation.
Observation of multiple edge state resonances oscillating across approximately 40 longitudinal modes.
Spatial confinement of the generated frequency comb at the lattice edge.

Conclusions:

Successful generation of topological frequency combs in a scalable nanophotonic platform.
Highlighting the potential for exploring topological physics in nonlinear frequency comb generation.
Providing a novel platform for on-chip frequency comb generation with unique properties.