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Metal pattern-based planar sub-THz filter in coplanar waveguide on optically transparent substrate.

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Summary

Researchers developed a compact sub-terahertz band-stop filter on transparent quartz glass. This device integrates seamlessly with optical microscopy for advanced biophysics and material science applications.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Physics

Background:

  • Sub-terahertz and terahertz frequencies (0.1-10 THz) offer significant potential across telecommunications, diagnostics, and biology.
  • A key challenge is creating compact, high-performance devices on optically transparent substrates for integration with optical techniques.

Purpose of the Study:

  • To design, fabricate, and measure a compact band-stop filter unit for the sub-terahertz F-band (90-140 GHz).
  • To develop a device compatible with optically transparent substrates for integration with microscopy and spectroscopy.

Main Methods:

  • Utilized a λ/4 open-end folded stub resonator within a coplanar waveguide.
  • Analyzed coupling variants via frequency domain simulations.
  • Fabricated the device on optically transparent quartz glass.

Main Results:

  • Successfully designed and fabricated a compact sub-terahertz band-stop filter unit.
  • Demonstrated compatibility with optically transparent substrates, enabling integration with optical methods.
  • The filter unit can be cascaded for enhanced performance.

Conclusions:

  • The developed sub-terahertz filter addresses the need for compact devices on transparent substrates.
  • The device facilitates integration with optical microscopy and spectroscopy for biophysics and material science.
  • Future work may involve cascading units for higher-order filter designs.