Researchers find liquids can enable high-power terahertz radiation: Page 2 of 2

October 31, 2017 //By Jean-Pierre Joosting
Scientists at the Tata Institute of Fundamental Research (TIFR), Mumbai have devised a high power radiation source in the much sought after terahertz (THz) region of the electromagnetic spectrum. The study was done in collaboration with laboratories in Greece and France and is described in the journal Nature Communications.

Their careful characterization and systematic study showed that the experimental conditions were simpler than those needed for air. The mechanism that facilitates the large output (in spite of the deleterious absorption) has emerged from models used by their theoretical collaborators from the Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas, Greece and Ecole Polytechnique, Paris. The essence of this model is that the femtosecond laser pulse induces secondary emissions in the liquid which would then combine with the incident laser pulse to produce the observed terahertz radiation.

The TIFR researchers foresee many applications in terahertz imaging, material analysis, explosives detection and terahertz nonlinear optics.

 

Reference

[1] Kim, K. Y., Taylor, A. J., Glownia, J. H. & Rodriguez, G. "Coherent control of terahertz supercontinuum generation in ultrafast laser-gas interactions." Nat. Photonics 2, 605-609 (2008).