Tera-Days: Attività INFN e prospettive per la radiazione THz e le sue applicazioni

Session

Fundamental Physics at THz and sub-THz

Apr 5, 2017, 4:30 PM

Sala Lauree (Sapienza Università di Roma e Sezione INFN di Roma)

Conveners

Fundamental Physics at THz and sub-THz

• Stefano Lupi (ROMA1)

13. THz response of innovative materials and metamaterials, metadevices and metasurfaces

Dr GianPaolo Papari (Physics Department, University of Naples "Federico II" and INFN Naples Unit)

4/5/17, 4:30 PM

Terahertz Time Domain Spectroscopy (THz-TDS) is a powerful tool for investigating the electrodynamic response of any kind of material and/or metamaterial. Using THz radiation (0.3-10 THz) one can retrieve in direct way essential information on material properties such as the refractive index and conductivity. These quantities are both described in terms of the complex dielectric function...

15. Nonlinear optical effects and third-harmonic generation in superconductors: Cooper pairs versus Higgs mode contribution

Dr Tommaso Cea (IIT)

4/5/17, 5:00 PM

The recent observation of a transmitted THz pulse oscillating at three times the frequency of the incident light paves the way to a powerful protocol to access resonant excitations in a superconductor. Here we show that this nonlinear optical process is dominated by light-induced excitation of Cooper pairs, while the collective amplitude (Higgs) fluctuations of the superconducting order...

7. STAX, a search for axion-like particles with sub-THz photons

Antonio Davide Polosa (ROMA1), Gianluca Cavoto (ROMA1)

4/5/17, 5:30 PM

An improved detection scheme for a light-shining-through-wall (LSW) experiment for axion-like particle searches is introduced. Extremely intense photon fluxes (from 100 kW to 1MW) from sources at frequencies in the sub-THz range are sent in an intense magnetic field where a photon to axion-like particle conversion is possible. A single photon detector in this frequency domain based on a...