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We present photonic crystals exhibiting a pronounced form birefringence at terahertz frequencies. These crystals can be employed as volumetric birefringent elements for a broad frequency range. Along with a theoretical discussion we demonstrate measurement results of a polymeric crystal.
The glass transition temperature Tg of polymers is identified by terahertz (THz) time-domain spectroscopy (TDS). The THz refractive index n of the investigated material changes significantly in the region of the glass transition. Hence, THz TDS offers the possibility for non-contact polymer analysis.
We present a THz time-domain spectrometer based on an 830 nm all semiconductor femtosecond laser system. Optical pulses with durations of less than 600 fs are used to gate standard LT-GaAs antennas. We achieve a signal to noise ratio of more than 40 dB in intensity and a bandwidth of 1.4 THz. Simulations based on the Drude-Lorentz model show a good agreement with the measured THz signals. Spectroscopic...
We present a new physical model for describing heterogeneous dielectric mixtures in the terahertz frequency range, which overcomes drawbacks of established models. The theory is confirmed by highly accurate data on polymeric compounds.
We demonstrate fully flexible, high performance terahertz Bragg reflectors and filters based on TiO2-loaded polymers. Broadband terahertz reflection measurements with corresponding transfer matrix simulations are shown and the effect of curvature is analyzed.
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