6533b828fe1ef96bd1287a74
RESEARCH PRODUCT
Wideband THz time domain spectroscopy based on optical rectification and electro-optic sampling
Alessandro TomasinoMarco PecciantiAlfonso Carmelo CinoAlessandro BusaccaRoberto MorandottiSalvatore StivalaAntonino ParisiPatrizia Livrerisubject
DiffractionTA1501Optical rectificationComputer scienceTerahertz radiationTerahertz radiationPhysics::OpticsSettore ING-INF/01 - ElettronicaArticleCrystalElectro-optic samplingOptical rectificationOpticsSampling (signal processing)Dispersion (optics)Thz time domain spectroscopyWidebandSpectroscopyAbsorption (electromagnetic radiation)Multidisciplinarybusiness.industrySettore ING-INF/02 - Campi ElettromagneticiQC0450Terahertz detectorsTerahertz sourcebusinessTelecommunicationsBeam (structure)description
We present an analytical model describing the full electromagnetic propagation in a THz time-domain spectroscopy (THz-TDS) system, from the THz pulses via Optical Rectification to the detection via Electro Optic-Sampling. While several investigations deal singularly with the many elements that constitute a THz-TDS, in our work we pay particular attention to the modelling of the time-frequency behaviour of all the stages which compose the experimental set-up. Therefore, our model considers the following main aspects: (i) pump beam focusing into the generation crystal; (ii) phase-matching inside both the generation and detection crystals; (iii) chromatic dispersion and absorption inside the crystals; (iv) Fabry-Perot effect; (v) diffraction outside, i.e. along the propagation, (vi) focalization and overlapping between THz and probe beams, (vii) electro-optic sampling. In order to validate our model, we report on the comparison between the simulations and the experimental data obtained from the same set-up, showing their good agreement.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-10-01 |