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Compact terahertz wave polarizing beam splitter.

Jiu-Sheng Li1, De-gang Xu, Jian-quan Yao

  • 1Centre for THz Research, China Jiliang University, Hangzhou 310018, China. lijsh2008@126.com

Applied Optics
|August 25, 2010
PubMed
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A compact terahertz (THz) polarizing beam splitter was developed using a periodic bilayer structure. This device efficiently separates THz wave polarized modes over a broad wavelength range with high accuracy.

Area of Science:

  • Optics and Photonics
  • Terahertz (THz) Technology
  • Metamaterials

Background:

  • Terahertz (THz) waves offer unique properties for various applications.
  • Efficient polarization control and separation of THz waves are crucial for THz systems.
  • Existing THz polarizing beam splitters often face limitations in size, bandwidth, or performance.

Purpose of the Study:

  • To design and demonstrate a compact terahertz (THz) wave polarizing beam splitter.
  • To achieve efficient separation of TE- and TM-polarized THz waves.
  • To operate over a wide THz wavelength range with high extinction ratios.

Main Methods:

  • Design of a compact polarizing beam splitter utilizing a periodic bilayer structure.
  • Numerical simulations employing the finite-element method (FEM) to analyze device performance.

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  • Tolerance analysis to assess the impact of fabrication errors.

    • Main Results:

    • The designed beam splitter operates effectively over a wide THz wavelength range.
    • Achieved high extinction ratios for both TE- (39.9 dB) and TM-polarized (23.7 dB) waves.
    • Demonstrated high polarization separation efficiency: 99.99% TE-wave deflection and 99.58% TM-wave transmission.
    • The device exhibits large tolerance to fabrication errors.

    Conclusions:

    • A compact and efficient THz wave polarizing beam splitter has been successfully designed.
    • The periodic bilayer structure enables high-performance polarization separation in a small footprint.
    • The device's robustness to fabrication errors suggests practical feasibility for real-world applications.