THz generation by a periodic array of a photoconductive antenna of GaAs material in the presence of a magnetic field
الموضوعات : Journal of Theoretical and Applied Physics
Sandeep Sandeep
1
,
Hitendra K. Malik
2
1 - Department of Physics, Deen Dayal Upadhyaya College, University of Delhi, New Delhi, India.
2 - Plasma Science and Technology Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India.
الکلمات المفتاحية: Transient current, Antennae, power, THz radiation, GaAs,
ملخص المقالة :
Terahertz radiation finds applications in medical science, spectroscopy, security screening, communication, etc. There are several methods that focus on the interaction of lasers with plasma, and laser beating process is an effective scheme for the Terahertz radiation generation. In this scheme, a resonance between the beating frequency and plasma frequency needs to be achieved. In general, only the plasma electrons respond to the lasers field. However, achieving a Terahertz source with variable frequency and power is very difficult, even with the application of an external magnetic field. In this article, we give an analytical analysis of how employing an external magnetic field, a laser-induced transient current in an array of GaAs structures can be used to increase the power of the emitted radiation. The magnetic field has the benefit of not stopping the carriers since these gyrate before they reache the corner, which causes the frequency to affect the current and helps lasting this interaction for a longer time. As a result, 2-3 cycles of the higher frequency pulse are generated, increasing the power by 100 times.
