FACILITIES

The facility, located at the first floor of the Physics department "Fermi building" room 112, hosts  the instruments to cover THz and sub-THz in a time-domain regime. 

A first Time-Domain Spectrometer, based on photoconductive antennas (Batop and Hamamatsu system) pumped by a Toptica FemtosecondFiber pro NIR laser, is used for linear THz spectroscopy in transmission, reflection and ATR configurations. This TDS system has also imaging performances through a raster scanning. 

Sub-wavelength THz spectroscopy can be performed through a photoantenna-based tip providing spectra among 0.3-2 THz and a spatial resolution of 3 um.

In the same lab, a Coherent Legend Ti:Sa laser amplifier (7 mJ, 1 KHz, 35 fs) allows to perform pump-probe spectroscopy both in the visible, near-IR and terahertz range through the coupling with a OPA system and the presence of several optical schemes for producing high-intensity THz, like the two-colors plasma technique, and the optical rectification process in organic crystals.

The facility, located at the third floor of the Physics department "Fermi building" room 318, hosts various Michelson Bruker interferometers which can be coupled to a Hyperion 1000 infrared microscope. Through these instruments we are able to perform frequency resolved experiments covering the spectral region from 50 to 8000 cm-1 (6 meV - 0.992 eV) in reflection, transmission and ATR configuration. 

The infrared microscope working from 400 to 8000 cm-1 provides spectra with a cooled MCT detector.

Spectroscopy and microscopy are performed vs. temperature through a closed-cycle cryostat (8-400 K) and a Nitrogen cooled cryostat (77-500 K). Frequency resolved experiments are extended in the ultraviolet through the use of a spectrophotometer JASCO working from 0.4 eV to 8 eV both in reflection and in transmission. 

The lab also puts at disposal an acoustic isolated chamber and related instruments for the development of photoacoustic experiments.