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11 November 2014 THz wave generation from micro-plasma
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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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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