Emerging material systems for integrated optical Kerr frequency combs

TL;DR

This paper reviews recent advances in material systems and device architectures for integrated optical Kerr frequency combs, highlighting emerging materials and designs that enhance comb performance and discussing future challenges.

Contribution

It provides a comprehensive overview of emerging materials and device architectures for Kerr frequency combs, expanding beyond traditional approaches.

Findings

Emerging materials enable tailored dispersion profiles.

New device architectures improve comb performance.

Challenges remain in integration and scalability.

Abstract

The experimental realization of a Kerr frequency comb represented the convergence of research in materials, physics, and engineering, and this symbiotic relationship continues to underpin efforts in comb innovation today. While the initial focus developing cavity-based frequency combs relied on existing microresonator architectures and classic optical materials, in recent years, this trend has been disrupted. This paper reviews the latest achievements in frequency comb generation using resonant cavities, placing them within the broader historical context of the field. After presenting well-established material systems and device designs, the emerging materials and device architectures are examined. Specifically, the unconventional material systems as well as atypical device designs that have enabled tailored dispersion profiles and improved comb performance are compared to the current state of art. The remaining challenges and future outlook for the field of cavity-based frequency combs is evaluated.