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Area of Science:

  • Terahertz (THz) Spectroscopy
  • Optical Metrology
  • Materials Science

Background:

  • Terahertz time-domain spectroscopy (THz-TDS) requires precise monitoring of radiation patterns.
  • Existing methods may lack versatility or require complex setups.
  • Lensless sensors offer potential for simplified THz-TDS systems.

Purpose of the Study:

  • To demonstrate the capability of lensless titanium-based antenna-coupled microbolometers (Ti-μbolometers) for precise radiation pattern monitoring in THz-TDS.
  • To evaluate Ti-μbolometers with different antennas across various THz-TDS configurations.
  • To investigate the spatial and polarization-sensitive properties of THz beams.

Main Methods:

  • Experiments were conducted using two distinct THz-TDS systems.
  • Ti-μbolometers were coupled with narrowband dipole antennas (0.3 THz, 0.7 THz) and a wideband log-periodic antenna.
  • Radiation patterns, spatial beam profiles, beam evolution, and polarization sensitivity were analyzed.

Main Results:

  • Ti-μbolometers demonstrated precise monitoring of radiation patterns in THz-TDS.
  • The sensors effectively characterized spatial beam profiles and evolution along the propagation axis.
  • Polarization-sensitive properties were revealed under varying THz emitter power.

Conclusions:

  • Lensless Ti-μbolometers are effective, convenient sensors for THz-TDS.
  • These microbolometers can discriminate and control THz radiation pattern features.
  • The technology is suitable for various wideband THz-TDS applications.