The project HI-TERA (High-intensity terahertz source for nonlinear spectroscopy at long wavelengths) is setting up a unique source of high-intensity pulses of radiation in the terahertz (THz) frequency range and develop precise simulation tools for the description of the interaction between intense THz radiation and crystalline materials (the THz region is identified in Figure 1).

Figure 1: Overview of the electromagnetic spectrum, with the THz range bordering the microwave and infrared regions

The THz source and the simulation tool together will comprise a new technology platform for the fast-rising field of nonlinear optics in the long-wavelength regime. We are generating THz signals with peak intensities comparable to or even higher than that of the far-infrared output of a free-electron laser, but with the convenience, stability and availability offered by modern table-top laser technology available in many femtosecond (indicating the typical pulse length of the laser sources – 1 fs = 10-15 s) laboratories. This shift of technology will enable a wealth of practical applications of nonlinear optics in the THz range.

With upcoming application areas of THz radiation such as wireless communications, stand-off detection and non-destructive testing, we anticipate the future impact to be comparable to the impact of nonlinear optics on optical communication technology and spectroscopic techniques. With the HI-TERA source we are capable of performing nonlinear THz spectroscopy of molecular crystals outside the international free-electron laser facilities. To demonstrate the potential of the proposed project we will apply the HI-TERA source to the first demonstration of nonlinear, two-dimensional spectroscopy in the THz range and assess the performance and validity of the technique.

The HI-TERA project is funded by the Danish Council for Independent Research|Technology and Production Sciences, and started on March 1st, 2012. The project will run for a period of three years. Currently the project employs Ph.D. student Pernille Klarskov Pedersen and Postdoc Andrew Strikwerda. On this page we will bring updates as new results and publications emerge.

Klarskov Thesis results:

Molecular dynamics simulation of 50 MV/cm THz pulse interaction with a single unit cell of cesium iodide (CsI)

MD simulation of 20 MV/cm THz pulse interaction with a 2x2x2 supercell of CsI

Phonon eigenmode motion at 1.74 THz in a single crystal of sucrose

O-H stretch mode in sucrose at approximately 95 THz

Scan through the focal plane of a focused 2-color air plasma THz beam

3D visualization of the focusing of a 2-color air plasma THz beam



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© 2012 Terahertz.dk Our research is carried out at DTU Fotonik - Department of Photonics Engineering, Technical University of Denmark. Suffusion theme by Sayontan Sinha