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Extremely Narrow Band in Moiré Photonic Time Crystal
Zhaohui Dong1, Xianfeng Chen1,2, Luqi Yuan1
1State Key Laboratory of Photonics and Communications, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
Physical Review Letters
|August 4, 2025
Summary
Researchers created a moiré photonic time crystal (PTC) by combining two modulations. This novel PTC supports unique temporal localized modes and self-reconstructing pulses, opening new avenues for optical wave manipulation.
Area of Science:
- Photonics
- Condensed Matter Physics
- Wave Phenomena
Background:
- Moiré superlattices are gaining traction in optics and electromagnetics.
- Time-varying photonic systems offer novel ways to control light propagation.
Purpose of the Study:
- To introduce the concept of moiré patterns into photonic time crystals (PTCs).
- To investigate the unique properties and potential applications of moiré PTCs.
Main Methods:
- Superposing two binary modulations on refractive index with different periods.
- Analyzing band structure in momentum space and temporal localization behavior.
- Exploring Floquet mode-locking mechanisms.
Main Results:
- Formation of extremely narrow bands in momentum space.
- Observation of temporal localized modes and self-reconstructing pulses.
- Demonstration of tunable band structure and temporal localization via modulation parameters.
- Evidence of Floquet mode-locking.
Conclusions:
- Moiré PTCs exhibit unique band structures supporting temporal localized modes.
- Tunability of moiré PTCs allows for manipulation of temporal properties.
- Potential applications in mode-locked lasers and exceptional-point-enhanced sensing.
