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Topological hysteretic winding for temporal anti-lasing
Haoye Qin1, Zhe Zhang1, Junda Wang1
1Laboratory of Wave Engineering, School of Electrical Engineering, EPFL, Lausanne, Switzerland.
Nature Communications
|July 4, 2025
Summary
Researchers demonstrate fast temporal anti-lasing for pulsed light absorption. This breakthrough extends coherent perfect absorption (CPA) to dynamic systems, enabling applications in ultrafast optics and neuromorphic networks.
Area of Science:
- Physics
- Optics
- Materials Science
Background:
- Coherent perfect absorption (CPA), or anti-lasing, is typically limited to continuous wave (CW) systems.
- Dynamic light-matter interactions in pulsed systems are crucial for advanced technologies like ultrafast optics and neuromorphic networks.
Purpose of the Study:
- To extend the capabilities of anti-lasing to pulsed operation.
- To introduce the phenomenon of fast temporal anti-lasing for transient photon absorption.
Main Methods:
- Utilizing robust topological transitions in a hysteretic scattering system.
- Temporally modulating the system to loop near a CPA singularity.
- Investigating the interplay between intrinsic memory and topology in wave scattering via Floquet engineering.
Main Results:
- Demonstrated fast temporal anti-lasing, achieving perfect photon absorption over ultrashort time scales.
- Generated fast absorption pulses and broadband absorption frequency combs.
- Showcased the potential of topological switching in Floquet-engineered systems.
Conclusions:
- Fast temporal anti-lasing opens new avenues for pulsed light absorption.
- The findings highlight the role of topology and memory in wave scattering phenomena.
- Potential applications include robust emission, routing, and detection in spiking photonic networks for analog neuromorphic hardware.
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