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Lasing-like Dynamics With Virtual Gain Driven By Complex-frequency Excitations.

Home
Lasing-like Dynamics With Virtual Gain Driven By Complex-frequency Excitations.

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Lasing-like dynamics with virtual gain driven by complex-frequency excitations.

Boyi Xue¹, Ruixiang Zhang¹, Yicheng Zhu¹

¹State Key Laboratory of Photonics and Communications Global College, Shanghai Jiao Tong University, Shanghai, China.

Nature Communications

|March 2, 2026

View abstract on PubMed

Summary

This summary is machine-generated.

Virtual gain in passive microcavities mimics laser dynamics without active media. This breakthrough enables enhanced light-matter interactions and perfect absorption, paving the way for advanced optical devices.

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Area of Science:

Non-Hermitian photonics
Quantum optics
Materials science

Background:

Complex-frequency excitation offers novel control over light-matter interactions.
Virtual loss has been explored for coherent perfect absorption.
Virtual gain in optical systems remains underexplored.

Purpose of the Study:

To theoretically and experimentally demonstrate lasing-like dynamics using virtual gain in passive microcavities.
To investigate the role of virtual gain in counteracting material and radiation losses.
To explore the coexistence of lasing-like behavior and perfect absorption.

Main Methods:

Utilizing complex-frequency excitations in passive whispering-gallery-mode microcavities.
Theoretical modeling and experimental validation of virtual gain effects.

Analyzing transmittance, response regimes, and threshold-like phenomena.

Main Results:

Demonstrated lasing-like dynamics in a passive microcavity via virtual gain.
Observed instantaneous transmittance exceeding unity, saturating at a quasi-steady value.
Identified a threshold-like point leading to a divergent, exponentially growing response, mimicking laser transient buildup.
Achieved robust coexistence of lasing-like behavior and perfect absorption, tunable by virtual gain.

Conclusions:

Virtual gain provides a versatile framework for manipulating non-Hermitian light-matter interactions in passive systems.
This approach bypasses the need for population inversion or active media, unlike traditional lasers.
Potential applications include advanced sensing, optical communications, and energy storage devices.