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Transflective spatial terahertz wave modulator.

ShiNa Tao, ZhiXiong Shen, HongGuan Yu

|April 1, 2022

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We developed a novel spatial terahertz wave modulator using liquid-crystal-integrated metadevices. This pixelated device dynamically controls terahertz wavefronts for advanced applications.

Area of Science:

Optics and Photonics
Metamaterials
Terahertz Technology

Background:

Spatial light modulators (SLMs) are crucial for manipulating light properties like amplitude, phase, and polarization.
Terahertz (THz) counterparts to SLMs are in high demand for applications in wireless communications and biomedical detection.
Existing THz modulators often face limitations in dynamic control and tunability.

Purpose of the Study:

To propose and demonstrate a novel spatial terahertz wave modulator.
To achieve dynamic control over terahertz wavefronts using a liquid-crystal-integrated metadevice.
To enable continuous tuning of Fano resonance and absorption peaks for versatile THz modulation.

Main Methods:

Fabrication of an 8x8 pixel spatial terahertz wave modulator.

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Integration of a liquid crystal layer between an asymmetric split ring resonator array and pixelated interdigital electrodes.

Utilizing Fano resonance for transmitted waves and perfect absorption for reflected waves.

Pixelated electrical driving of the liquid crystal for environmental refractive index tuning.

Main Results:

Demonstration of a transflective spatial terahertz wave modulator.
Achieved continuous tuning of Fano resonance and absorption peaks by controlling the liquid crystal layer.
The device exhibits dynamic reconfiguration capabilities for terahertz wavefronts.
Simultaneous manipulation of transmitted and reflected terahertz waves.

Conclusions:

The proposed liquid-crystal-integrated metadevice offers a novel solution for spatial terahertz wave modulation.
This technology enables dynamic wavefront control and opens new avenues for THz applications.
The transflective nature and tunable resonance provide significant advantages over existing THz modulators.