Terahertz pump-probe spectroscopy in YBCO thin films

Anna K. Kristoffersen; H. Tiedje; Robert A. Hughes; Harold K. Haugen; Thomas Timusk; John S. Preston

doi:10.1117/12.567580

16 November 2004 Terahertz pump-probe spectroscopy in YBCO thin films

Anna K. Kristoffersen, H. Tiedje, Robert A. Hughes, Harold K. Haugen, Thomas Timusk, John S. Preston

Proceedings Volume 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers; (2004) https://doi.org/10.1117/12.567580
Event: Photonics North, 2004, Ottawa, Ontario, Canada

Abstract

Terahertz (THz) radiation is ideal for probing many different materials and processes. Photons in the THz regime have energies on the order of an meV, which is an important energy scale for many electronic processes. In this paper we will describe the use of optical rectification of 50 fs IR pulses to generate THz pulses. Using this method, spectrally broad THz pulses with durations on the order of ps can be produced. This feature allows us to obtain time and frequency resolved information about the transmission of THz radiation during transient processes. A 50 fs IR pulse is used to optically excite a material and the relaxation as a function of time can be observed with the THz probe. We are developing a transient THz spectroscopy to study non-equilibrium processes in thin film superconducting YBa₂Cu₃O_7-δ (YBCO). We use ultrafast optical pulses to excite the sample, breaking a fraction of the Cooper pairs responsible for the film's superconductivity. This process produces highly energetic quasiparticles which thermalize and recombine on a picosecond timescale as the superconducting state recovers. Transient THz spectroscopy allows us to follow the evolution of this process with the required resolution, while simultaneously providing valuable spectroscopic information.

Citation Download Citation

Anna K. Kristoffersen, H. Tiedje, Robert A. Hughes, Harold K. Haugen, Thomas Timusk, and John S. Preston "Terahertz pump-probe spectroscopy in YBCO thin films", Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); https://doi.org/10.1117/12.567580

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KEYWORDS

Terahertz radiation

Superconductors

Crystals

Spectroscopy

Beam analyzers

Phonons

Picosecond phenomena

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