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Liquid-crystal-integrated metadevice: towards active multifunctional terahertz wave manipulations
Optics Letters
|October 2, 2018
Summary
This study introduces a novel terahertz metadevice with dual functions for transmitted and reflected waves. The active device offers tunable electromagnetically induced transparency and perfect absorption for advanced terahertz applications.
Area of Science:
- Terahertz (THz) technology
- Metamaterials and Metadevices
- Liquid Crystal Photonics
Background:
- Active terahertz elements are crucial for applications like security screening and wireless communications.
- Existing terahertz devices often lack multifunctionality and active tunability.
- There is a growing demand for versatile terahertz components.
Purpose of the Study:
- To propose and demonstrate an innovative terahertz metadevice with distinct transmission and reflection functionalities.
- To achieve active tunability of the metadevice using liquid crystals.
- To explore the potential for multifunctional terahertz apparatuses.
Main Methods:
- Fabrication of a terahertz metadevice comprising a liquid crystal layer sandwiched between Au comb electrodes and a dual-ring resonator array.
- Utilizing in-plane switching of liquid crystals actuated by comb electrodes for active tuning.
- Characterization of transmission and reflection properties in the terahertz frequency range.
Main Results:
- Demonstration of an electromagnetically induced transparency (EIT) analog in transmission mode.
- Achieved perfect absorption in reflection mode.
- Exhibited 60 GHz frequency tuning of the EIT analog and 15% modulation depth for absorption, with millisecond-scale response times.
Conclusions:
- The proposed terahertz metadevice successfully integrates distinct transmission (EIT analog) and reflection (perfect absorber) functionalities.
- Active tunability via in-plane liquid crystal switching enables dynamic control over terahertz wave manipulation.
- This work provides a promising platform for developing advanced, multifunctional active terahertz devices.
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