Single-mode emission by phase-delayed coupling between nanolasers
Author(s)
Type
Journal Article
Abstract
Near-field coupling between nanolasers enables collective high-power lasing but leads to complex spectral reshaping and multimode operation, limiting the emission brightness, spatial coherence, and temporal stability. Many lasing architectures have been proposed to circumvent this limitation based on symmetries, topology, or interference. We show that a much simpler and robust method exploiting phase-delayed coupling, where light exchanged by the lasers carries a phase, can enable stable single-mode operation. Phase-delayed coupling changes the modal amplification: for pump powers close to the anyonic parity-time (PT) symmetric exceptional point, a high phase delay completely separates the mode thresholds, leading to single-mode operation. This is shown by stability analysis with nonlinear coupled mode theory and stochastic differential equations for two coupled nanolasers and confirmed by a realistic semianalytical treatment of a dimer of lasing nanospheres. Finally, we extend the mode control to large arrays of nanolasers featuring lowered thresholds and higher power. Our work promises a novel solution to engineer bright and stable single-mode lasing from nanolaser arrays with important applications in photonic chips for communication and LIDAR.
Date Issued
2025-05-21
Date Acceptance
2025-04-23
Citation
ACS Photonics, 2025, 12 (5), pp.2337-2343
ISSN
2330-4022
Publisher
American Chemical Society (ACS)
Start Page
2337
End Page
2343
Journal / Book Title
ACS Photonics
Volume
12
Issue
5
Copyright Statement
Copyright © 2025 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0 (http://creativecommons.org/licenses/by/4.0/)
License URL
Identifier
10.1021/acsphotonics.4c01230
Subjects
single-mode laser
nanolaser
nonlinear dynamics
parity-time symmetry
exceptional point
Publication Status
Published
Date Publish Online
2025-05-05