A polymer THz fiber made of Topas and having a Photonic Crystal Fiber structure is demonstrated. It has low broadband loss and the dispersion of the fiber can be tailored by adjusting the structural parameters.

This paper demonstrates broadband THZ near-field measurements performed on different types of antennas and meta materials structures, all having sub-wavelength dimensions. The time and frequency dependence of the electric near-field are presented and compared with numerical calculations. Using terahertz time-domain spectroscopy (THz-TDS), the electric near-field components Ex(t), Ey(t) and Ez(t) in the vicinity of antenna structures for wave vectors k corresponding to kaLt1, kaap1 and ka >1, where a is the typical dimension of the structure. The measurements reveal how the extremity of the wire generates propagating fields resembling a Sommerfeld wave on a cylindrical wire.

Sub-wavelength, metallic circular aperture arrays were studied in the near-field at terahertz frequencies, using terahertz time-domain spectroscopy (THz-TDS). Two different periodicities were investigated and array subsections were imaged in both the time- and frequency-domain.

We present measurements and calculations of the THz electric field in the nearfield of sub-wavelength metal structures.

We have developed a terahertz near-field imaging system detecting both amplitude and phase of the electric field spatiotemporally. Imaging one-dimensional slits on metal substrate reveals both propagating and surface-bound waves, strongly dependent on the frequency.

A terahertz near-field imaging has been developed, spatiotemporally imaging both the amplitude and phase of the horizontal and vertical components of the electric field vector over the spectral range from 50 GHz to 1.5 THz.

We compare the near-field imaging of a free standing perforated metal film and a PMMAgraphite composite film with arrays of periodic holes at the terahertz frequency range of from 0.05 THz to 1.65 THz region.