Optical terahertz metamaterial switch controlled via high-stability CsPbBr₃ microcrystals

Area of Science:

• Materials Science
• Optoelectronics
• Terahertz Technology

Background:

• Dynamic control of terahertz metamaterials often relies on organic perovskites, which suffer from poor environmental stability and hydrolysis.
• Existing methods require stringent preparation conditions, limiting practical applications.

Purpose of the Study:

• To develop a highly stable and optically controlled terahertz metamaterial switch.
• To overcome the environmental instability issues associated with organic perovskite materials.

Main Methods:

• Synthesized CsPbBr3 microcrystals via precipitation from a water-dimethylformamide (DMF) mixed-solution.
• Integrated CsPbBr3 microcrystals with terahertz metamaterials to create a hybrid device.
• Investigated the optical control of terahertz waves using photoelectric and photothermal effects.

Main Results:

• Achieved a 24% modulation factor under light excitation due to CsPbBr3 microcrystal effects.
• Demonstrated exceptional device stability, with the modulation factor remaining unchanged after four months of air exposure.
• Observed a frequency shift in dipole resonance and switching of Fano resonance upon integration.

Conclusions:

• Hybridization with stable CsPbBr3 microcrystals offers a robust solution for dynamic terahertz metamaterial control.
• The developed system provides a novel and stable approach for optical switching of terahertz waves.
• This work paves the way for practical applications of stable, optically controlled terahertz devices.