Terahertz liquid crystal programmable metasurface based on resonance switching

Area of Science:

• Metamaterials and Nanophotonics
• Liquid Crystal Technology
• Electromagnetic Wave Manipulation

Background:

• Programmable metasurfaces are crucial for dynamic wave manipulation, including beamforming and steering.
• Current multi-bit programming schemes for liquid crystal metasurfaces face challenges with electrically addressable arrays, leading to symmetrical beam diffraction.
• Developing advanced metasurface programming is essential for next-generation optical and communication systems.

Purpose of the Study:

• To introduce a novel liquid crystal metasurface design utilizing a resonance switching mechanism.
• To achieve quasi-2-bit coding control for enhanced meta-unit manipulation.
• To overcome limitations of existing multi-bit programming schemes and reduce unwanted diffraction.

Main Methods:

• Implementation of a liquid crystal metasurface with interdigital structure electrodes.
• Utilizing a resonance switching mechanism for quasi-2-bit modulation.
• Employing a universal binary coding system for control.

Main Results:

• Demonstrated a quasi-2-bit modulation capability for the liquid crystal metasurface.
• Achieved suppression of the unwanted -1 diffraction order.
• Attained a maximum single-beam scanning angle of ±21° with active beam manipulation.

Conclusions:

• The proposed resonance switching mechanism offers a feasible and robust multi-bit coding scheme for liquid crystal metasurfaces.
• This advancement is highly promising for terahertz (THz) applications, including spatial light modulators and wireless communication.
• The developed technology enables more elaborate control and improved performance in dynamic wave manipulation.