THz wave generation from micro-plasma

F. Buccheri; X.-C. Zhang

doi:10.1117/12.2075539

11 November 2014 THz wave generation from micro-plasma

F. Buccheri, X.-C. Zhang

Proceedings Volume 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III; 92750E (2014) https://doi.org/10.1117/12.2075539
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

We investigated the broadband terahertz (THz) emission from sub millimeter laser-induced plasmas. The angular dependent emission from the source was characterized with coherent detection, showing that the radiation pattern peak is located 80 degrees away the propagation direction of the excitation laser. Our findings support the laser ponderomotive force as the main driver for the generation of THz transients. We report the measurement of THz waveforms generated in ambient air with laser excitation energies as low as 660 nJ. The experimental results suggest the laser-induced microplasma as a promising approach to reduce the laser threshold typical of THz air photonics systems of many orders of magnitude, with the result of scaling down the cost of broadband terahertz spectroscopy.

Citation Download Citation

F. Buccheri and X.-C. Zhang "THz wave generation from micro-plasma", Proc. SPIE 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III, 92750E (11 November 2014); https://doi.org/10.1117/12.2075539

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