Abstract-The effect of beam pre-bunching on the excitation of terahertz plasmons in a parallel plane guiding system

Suresh C. Sharma¹ and Pratibha Malik¹
 http://scitation.aip.org/content/aip/journal/pop/22/4/10.1063/1.4916765?TRACK=RSS
1 Department of Applied Physics, Delhi Technological University (DTU), Shahbad Daulatpur, Bawana Road, Delhi-110042, India
Phys. Plasmas 22, 043301 (2015); http://dx.doi.org/10.1063/1.4916765

The excitation of terahertz (THz) plasmons by a pre-bunched relativistic electron beam propagating in a parallel plane semiconducting guiding system is studied. It is found that the n-InSb semiconductor strongly supports the confined surface plasmons in the terahertz frequency range. The growth rate and efficiency of the THz surface plasmons increase linearly with modulation index and show the largest value as modulation index approaches unity. Moreover, the growth rate of the instability scales as one-third power of the beam density and inverse one-third power of the THz radiation frequency.