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Updated: Aug 1, 2026
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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
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Directional terahertz holography with thermally active Janus metasurface
Benwen Chen1,2, Shengxin Yang1, Jian Chen3
1Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing, 210023, China.
Light, Science & Applications
|June 4, 2023
Summary
Thermally activated terahertz (THz) Janus metasurfaces enable directional holography by controlling THz wave transmission directionally. This breakthrough allows for temperature- and direction-dependent manipulation of THz waves for advanced applications.
Area of Science:
- Optics and Photonics
- Metamaterials
- Terahertz (THz) Technology
Background:
- Dynamic manipulation of electromagnetic (EM) waves is crucial for advanced information processing.
- Achieving directional terahertz (THz) holography remains a significant challenge in the field.
- Janus metasurfaces offer potential for distinct responses to EM waves from opposite directions.
Purpose of the Study:
- To demonstrate thermally activated THz Janus metasurfaces for directional holography.
- To achieve asymmetric transmission and focusing of THz waves using reconfigurable metasurfaces.
- To explore applications in THz optical information encryption, data storage, and smart windows.
Main Methods:
- Integration of phase change materials onto meta-atoms of THz Janus metasurfaces.
- Utilizing thermal activation to control the phase delays and transmission properties.
- Experimental demonstration of asymmetric focusing and directional THz holography.
Main Results:
- Successful creation of reconfigurable Janus metasurfaces exhibiting asymmetric THz wave transmission.
- Demonstration of temperature- and incident direction-dependent manipulation of THz wave information.
- Achieved directional THz holography with free-space image projections.
Conclusions:
- Thermally activated THz Janus metasurfaces provide a versatile strategy for reconfigurable metamaterial devices.
- This approach enables precise control over THz wave propagation for directional holography.
- Potential applications include THz optical information encryption, data storage, and smart windows.
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