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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Steerable terahertz beams using surface waves on an active metasurface.

Yaseman Shiri1, Jeffrey Lei2, Yasith Amarasinghe3

  • 1School of Engineering, Brown University, Providence, USA. yaseman_shiri@brown.edu.

Scientific Reports
|December 26, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method for beam steering in the sub-terahertz range using active metasurfaces within a waveguide. This approach dynamically controls wave fronts by altering guided mode wave vectors, enabling new possibilities for sensing and communication applications.

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Area of Science:

  • Electromagnetism
  • Materials Science

Background:

  • Controlling wave fronts in the sub-terahertz spectrum is crucial for advanced sensing and communication.
  • Active metasurfaces offer tunable electromagnetic properties but are typically used in transmission or reflection modes.

Purpose of the Study:

  • To explore the exploitation of surface waves for enhanced metasurface functionality.
  • To develop a novel beam steering mechanism in the sub-terahertz range.

Main Methods:

  • Integrating an active metasurface within a parallel-plate waveguide.
  • Utilizing surface-wave geometry for wave manipulation.
  • Analyzing the effect of electrical property changes on the guided mode wave vector.

Main Results:

  • Demonstrated that altering metasurface electrical properties modifies the guided mode wave vector.
  • Showcased broadband beam steering by controlling radiation out-coupled through a leaky-wave slot.
  • Validated results through numerical simulations.

Conclusions:

  • The study presents a new configuration for active metasurfaces exploiting surface waves within a waveguide.
  • This approach enables effective broadband beam steering for sub-terahertz applications.
  • The findings offer a promising direction for future dynamic wave front control technologies.