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Related Concept Videos

Reflection of Waves01:07

Reflection of Waves

4.7K
When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Related Experiment Video

Updated: Mar 14, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Dynamic Wavefront Manipulation Enabled with VO2-Based Reflective Terahertz Metasurfaces.

Ruifan Huang1, Shangchu Shi1, Mohan Sun1

  • 1Department of Electronic Science and Technology, School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China.

Nanomaterials (Basel, Switzerland)
|March 13, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel dynamic reflective terahertz (THz) metasurface for advanced wavefront control. The design enables multifunctional THz devices for applications in communication and imaging.

Keywords:
THz metasurfaceVO2dynamic controlfocused beamvortex beamwavefront

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Area of Science:

  • Terahertz (THz) technology
  • Metamaterials and Nanophotonics
  • Wavefront engineering

Background:

  • Dynamic wavefront control is essential for terahertz (THz) applications like non-destructive testing, wireless communication, and imaging.
  • Current THz wavefront control methods face limitations including complexity, narrow bandwidth, and single-functionality.

Purpose of the Study:

  • To develop a versatile dynamic reflective THz metasurface overcoming limitations of existing technologies.
  • To enable efficient and multifunctional wavefront control in the THz spectrum.

Main Methods:

  • Proposed a dynamic reflective THz metasurface utilizing nested split-ring unit cells with vanadium dioxide (VO2) and aluminum.
  • Achieved independent 2π phase coverage at 1.07 THz by rotating inner/outer rings in different VO2 states.
  • Demonstrated high polarization-conversion efficiency (PCR > 0.98).

Main Results:

  • Constructed three reflective metasurfaces demonstrating broadband focusing beams with tunable focal lengths.
  • Generated broadband vortex beams with variable topological charges.
  • Created a switchable beam capable of transitioning between focusing and vortex modes based on VO2 state.

Conclusions:

  • The proposed nested split-ring metasurface offers flexibility for compact, multifunctional THz devices.
  • This design shows significant potential for integrated THz systems, high-capacity communications, and high-resolution imaging.