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Bifunctional Spatiotemporal Metasurfaces for Incident Angle-Tunable and Ultrafast Optically Switchable
Yuze Hu1, Mingyu Tong1, Zhongjie Xu1
1College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China.
Small (Weinheim an Der Bergstrasse, Germany)
|April 10, 2021
Summary
Researchers developed versatile ultrafast terahertz (THz) switching using tunable metamaterials. Incident angle and photon injection control resonant states, enabling THz wave manipulation for advanced photonic devices.
Area of Science:
- Optics and Photonics
- Materials Science
- Condensed Matter Physics
Background:
- Tunable metamaterials and metasurfaces enable novel optical components and light tailoring.
- Ultrafast modulation is crucial for terahertz (THz) photonics advancements in communication, sensing, and imaging.
- Current research often focuses on single functionalities, limiting innovative features.
Purpose of the Study:
- To demonstrate versatile, ultrafast THz switching behaviors.
- To explore multidimensional THz wave manipulation using incident angle-induced symmetry breaking and photon injection.
- To achieve continuously alterable resonant states in metamaterials.
Main Methods:
- Utilizing incident angle-induced C2 symmetry breaking of split ring pairs.
- Employing direction-controlled resonance hybridization for THz wave routing.
- Implementing photon injection to switch off LC mode and EIT-like resonances.
- Investigating transient dynamics in MoSe2 crystal.
Main Results:
- Experimentally demonstrated extremely versatile, ultrafast THz switching.
- Achieved continuously alterable resonant states through angle-induced symmetry breaking.
- Successfully switched off resonances using photon injection, with ultrafast recovery (<700 ps) due to MoSe2's short carrier lifetime.
- Showcased direction-controlled resonance hybridization for routing freedom.
Conclusions:
- The proposed strategy enables multidimensional THz wave manipulation.
- This approach is a viable pathway for diversified functionalities in metaphotonic devices.
- The technique offers robustness, simplicity, and wide tunability for THz applications.
