Single-Cavity Bi-Color Laser Enabled by Optical Anti-Parity-Time Symmetry

TL;DR

This paper demonstrates a novel bi-color laser in a single micro-ring resonator enabled by anti-parity-time symmetry, offering stable, tunable multi-color emission for integrated photonics.

Contribution

It introduces a new approach to achieve stable bi-color lasing using anti-parity-time symmetry in a single resonator with spatiotemporal modulation.

Findings

Stable bi-color lasing demonstrated theoretically and numerically.

The laser exhibits tunable, demultiplexed multi-color output.

Potential for compact on-chip multi-color light sources.

Abstract

The exploration of quantum-inspired symmetries in optical systems has spawned promising physics and provided fertile ground for developing devices exhibiting exotic functionalities. Founded on the anti-parity-time (APT) symmetry that is enabled by both spatial and temporal interplay between gain and loss, we demonstrate theoretically and numerically bi-color lasing in a single micro-ring resonator with spatiotemporal modulation along its azimuthal direction. In contrast to conventional multi-mode lasers that have mixed-frequency output, our laser exhibits stable, demultiplexed, tunable bi-color emission at different output ports. Our APT-symmetry-based laser may point out a new route for realizing compact on-chip coherent multi-color light sources.