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Related Experiment Video

Updated: May 10, 2026

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

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Antireflection coatings optimized for single-cycle THz pulses.

Fabian D J Brunner1, Thomas Feurer

  • 1Institute of Applied Physics, University of Bern, Bern, Switzerland. brunner@iap.unibe.ch

Applied Optics
|June 6, 2013
PubMed
Summary

Adding an antireflection coating to terahertz (THz) sources significantly boosts THz pulse transmission. The optimal coating thickness varies based on the desired THz waveform optimization for amplitude or energy.

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Area of Science:

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

Background:

  • Terahertz (THz) pulse generation is crucial for various scientific and technological applications.
  • Efficient transmission of THz radiation from high refractive index sources is often limited by Fresnel reflections.
  • Antireflection (AR) coatings are commonly used to minimize optical losses.

Purpose of the Study:

  • To investigate the impact of single-layer antireflection coatings on THz pulse transmission from high refractive index emitters.
  • To determine the influence of coating thickness on optimizing THz waveform characteristics.

Main Methods:

  • Theoretical calculations were performed to model the effect of AR coatings on THz waveforms.
  • Experimental measurements were conducted using a lithium niobate crystal as a THz source.

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Last Updated: May 10, 2026

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  • A fused silica AR coating of 100 μm thickness was applied and characterized.

    • Main Results:

    • A single-layer AR coating substantially increased THz pulse transmission.
    • The optimal coating thickness was found to be dependent on the specific THz waveform parameters to be optimized (peak amplitude, spectral amplitude, or energy).
    • Experimental results showed a 15% increase in peak amplitude, a 33% increase in peak spectral amplitude, and a 48% increase in energy.

    Conclusions:

    • Single-layer antireflection coatings are an effective method for enhancing THz transmission from high refractive index materials.
    • Tailoring AR coating thickness allows for optimization of specific THz pulse characteristics.
    • This approach offers a practical route to improve the performance of THz sources.