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Reflection-enhanced terahertz beam steering via a backside-driven metasurface enabled by dielectric-superstrate
Optics Express
|September 23, 2025
Summary
This study introduces a novel backside-driven active metasurface for terahertz beam steering. This simplified design enables enhanced reflection and phase modulation via vanadium dioxide switches, advancing THz applications.
Area of Science:
- Metasurfaces
- Terahertz (THz) technology
- Optoelectronics
Background:
- Actively tuned metasurfaces are crucial for THz beam steering.
- Existing metal-dielectric-metal configurations limit structural simplicity and active control integration.
Purpose of the Study:
- To propose a backside-driven active metasurface for reflected THz beam steering.
- To overcome limitations of conventional metasurface architectures.
- To enable simplified active control integration.
Main Methods:
- A novel metasurface design using a dielectric superstrate and rear-mounted meta-atoms with vanadium dioxide (VO2) switches.
- Analysis of interface impedances in ON and OFF states using transmission line theory.
- Matching dielectric superstrate thickness for phase shift optimization.
Main Results:
- Achieved a 1-bit phase shift of 180° around 0.34 THz by toggling VO2 switches.
- Demonstrated accurate THz beam steering towards designated angles using 1-bit coding sequences.
- Successfully redirected THz beam to specular reflection when all VO2 switches were in the ON state.
Conclusions:
- The proposed backside-driven metasurface offers a simplified architecture for THz beam steering.
- This design allows for backside control integration without front-side disturbance.
- Presents a significant advancement for THz metasurface applications in communications, detection, and imaging.
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