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Plasmonic metamaterial time crystal
Tingwen Guo1, Jules Sueiro2, Gian Marcello Andolina2
1Laboratoire des Solides Irradiés, Ecole Polytechnique, CEA, CNRS, Institut Polytechnique de Paris, Palaiseau, France.
Nature
|July 29, 2026
Summary
Researchers demonstrate an all-optical photonic time crystal using plasmonic metamaterials. This breakthrough enables strong, ultrafast modulation for novel light-matter interactions and reduced losses in terahertz frequencies.
Area of Science:
- Photonics
- Metamaterials
- Optical Physics
Background:
- Spatial photonic crystals (SPCs) enable light-matter interactions via periodic dielectric contrast.
- Photonic time crystals (PTCs) offer similar advances by modulating optical properties in time, but require challenging ultrafast modulation.
- All-optical PTCs have remained elusive due to difficulties in achieving ultrafast modulation.
Purpose of the Study:
- To demonstrate the first all-optical realization of a photonic time crystal.
- To explore the use of surface plasmon cavity metamaterials for achieving PTCs.
- To investigate the dynamics and properties of light in the terahertz frequency regime.
Main Methods:
- Utilized a surface plasmon cavity metamaterial operating at terahertz frequencies.
- Achieved strong, coherent, sub-optical cycle periodic driving via field-induced modulation of carrier kinetic energy and effective mass.
- Employed spectroscopic measurements to observe the transition into the PTC regime.
Main Results:
- Demonstrated near-unity, coherent periodic driving of the plasmonic metamaterial.
- Observed a transition into the PTC regime mediated by an exceptional point where Floquet-driven optical eigenmodes coalesce.
- Showed emergent gain reducing plasmonic losses by over 50% and predicted plasmonic lasing.
Conclusions:
- Established a robust platform for time-domain photonics in plasmonic systems.
- The all-optical PTC opens new avenues for light-matter interaction studies.
- Potential for reduced losses and lasing in terahertz plasmonic devices.
