scientists demonstrate that liquid water can generate THz waves
scientists in the new study found that the THz radiation from water exhibits very different characteristics compared to the THz radiation from air plasma. For example, a longer laser pulse duration increases the amount of THz radiation energy generated from water, but for air plasma the opposite is true: a shorter pulse increases the THz radiation. The scientists also found that, when positioned away from the normal incident angle of optical excitation, the strength of the THz radiation from water depends on the polarization of the laser beam, whereas the THz radiation from the air plasma is polarization-independent.
The researchers explain that these observations cannot be fully explained by physicists’ current understanding of the mechanisms involved in THz wave generation.
scientists demonstrate that liquid water can generate THz waves
scientists in the new study found that the THz radiation from water exhibits very different characteristics compared to the THz radiation from air plasma. For example, a longer laser pulse duration increases the amount of THz radiation energy generated from water, but for air plasma the opposite is true: a shorter pulse increases the THz radiation. The scientists also found that, when positioned away from the normal incident angle of optical excitation, the strength of the THz radiation from water depends on the polarization of the laser beam, whereas the THz radiation from the air plasma is polarization-independent.
The researchers explain that these observations cannot be fully explained by physicists’ current understanding of the mechanisms involved in THz wave generation.
https://phys.org/news/2017-08-thought-impossible-scientists-liquid-thz.html
http://aip.scitation.org/doi/10.1063/1.4990824