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Related Concept Videos

Transmission Electron Microscopy01:15

Transmission Electron Microscopy

In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400 keV in...

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Related Experiment Video

Updated: May 31, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

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Published on: December 27, 2012

Extreme-Thickness Meta-Membrane for Controlling Terahertz Vectorial Beams.

Yufei Song1, Yixiang Xu1, Yikai Xu1

  • 1State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Department of Physics, Fudan University, Shanghai, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 29, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed ultra-thin flexible metasurfaces (MSs) for terahertz (THz) beam manipulation. This novel design enables precise control over THz wave-fronts and polarization for advanced optical applications.

Keywords:
extreme‐thickness structuresmetasurfacesnear‐field couplingterahertzvectorial bessel beams

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Area of Science:

  • Terahertz (THz) optics
  • Metasurface (MS) engineering
  • Wave manipulation

Background:

  • Conventional terahertz (THz) beam manipulation devices are bulky and not suitable for optical integration.
  • Transmission-mode metasurfaces (MSs) typically require significant thickness for effective phase modulation.

Purpose of the Study:

  • To propose and demonstrate a new type of flexible metasurface (MS) for efficient transmission-mode manipulation of terahertz (THz) beams.
  • To achieve wide-range phase and polarization control of THz waves using an ultra-thin meta-system.

Main Methods:

  • Proposed a flexible metasurface (MS) composed of two metallic screens with tailored air slits.
  • Utilized near-field coupling of two slit resonances for wave manipulation, enabling an extremely thin structure (∼λ/30).
  • Employed leaky eigenmode theory for analysis and full-wave simulations for experimental validation.

Main Results:

  • Demonstrated that the phase and polarization of transmitted THz waves can be modulated by altering slit geometries and orientations.
  • Successfully constructed three THz MSs using coupled air-slits as meta-atoms.
  • Generated scalar and radially polarized vectorial Bessel beams at 0.39 THz illumination.

Conclusions:

  • The proposed ultra-thin, flexible metasurface (MS) offers a novel approach for transmissive terahertz (THz) beam manipulation.
  • This technology is suitable for integration into compact optical systems.
  • Potential applications include biosensing, communications, and advanced display technologies.