Abstract-Terahertz radiation for medical application

Reenu Gill, Sheetal Punia, Hitendra K. Malik,

http://iopscience.iop.org/article/10.1209/0295-5075/123/65003

Terahertz (THz) radiations focused at multiple positions are quite useful for their medical application. For this, we propose to employ beating of dark hollow Gaussian laser beams (DHGBs) of different beam orders in plasma. In view of realistic situations, we also include the collisions between the electrons and the neutrals. Because of a special intensity gradient distribution in DHGBs, the emitted THz radiation is found to have a unique field profile with multiple focii. The dependence of plasma density, order of the beams and collision frequency on the THz field amplitude is discussed. The important feature to consider hollow Gaussian laser beams is having the same power at different beam orders. It is found that the amplitude of the emitted radiation is highly sensitive to the beam order of the incident lasers. An optimization of the plasma parameters and the lasers characteristics can lead to the enhancement in the THz intensity and the efficiency of the mechanism.