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Related Experiment Videos

Wet-etch optimization of free-standing terahertz frequency-selective structures.

Frank Baumann1, William A Bailey, Ahmer Naweed

  • 1Photonics and Optoelectronic Device Center, University of Massachusetts-Lowell, Lowell, Massachusetts 01854, USA.

Optics Letters
|June 21, 2003
PubMed
Summary

Frequency-selective surfaces (FSS) are tunable using wet chemical etching. This technique adjusts terahertz laser filters, enhancing performance by suppressing unwanted laser lines while maintaining high transmittance.

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Area of Science:

  • Terahertz (THz) technology
  • Materials science
  • Nanofabrication

Background:

  • Frequency-selective surfaces (FSS) are crucial components in THz applications.
  • Tuning FSS properties is essential for optimizing device performance.
  • Existing tuning methods may have limitations in precision or scalability.

Purpose of the Study:

  • To investigate the tunability of free-standing FSS using wet chemical etching.
  • To demonstrate the application of etched FSS as bandpass filters for THz lasers.
  • To evaluate the impact of etching on FSS performance parameters.

Main Methods:

  • Fabrication of free-standing FSS with cross-aperture arrays on ~10-microm copper films.
  • Utilizing wet chemical etching to precisely alter aperture dimensions.

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  • Characterization of FSS transmittance and filtering capabilities.

    • Main Results:

    • Achieved tunable center frequencies from 1.57 to 1.53 THz with high transmittance.
    • Demonstrated adjustment of bandwidth, peak transmittance, and sidelobe transmittance via etching.
    • Successfully employed etched FSS as bandpass filters for difluoromethane THz lasers.

    Conclusions:

    • Wet chemical etching offers a viable method for tuning FSS properties.
    • Etched FSS exhibit enhanced performance as bandpass filters for THz lasers.
    • The technique allows for precise control over spectral characteristics and suppression of competing laser lines.