Ashim P Jain
Articles written in Pramana – Journal of Physics
Volume 61 Issue 3 September 2003 pp 625-631
Surface plasma waves over bismuth-vacuum interface
A surface plasma wave (SPW) over bismuth-vacuum interface has a signature of mass anisotropy of free electrons. For SPW propagation along the trigonal axis there is no birefringence. The frequency cutoff of SPW$$\omega _{cutoff} = \omega _p /\sqrt {2(\varepsilon _L + \varepsilon )} $$ lies in the far infrared region and can be accessed using free electron laser. The damping rate of waves at low temperatures is low. The surface plasma wave may be excited by an electron beam of current ∼100 mA propagating parallel to the interface in its close proximity.
Volume 65 Issue 2 August 2005 pp 311-321
Excitation of surface plasma waves over corrugated slow-wave structure
Ashim P Jain Jetendra Parashar
A microwave propagating along vacuum—dielectric—plasma interface excites surface plasma wave (SPW). A periodic slow-wave structure placed over dielectric slows down the SPW. The phase velocity of slow SPW is sensitive to height, periodicity, number of periods, thickness and the separation between dielectric and slow-wave structure. These slow SPW can couple the microwave energy to the plasma and can sustain the discharge. The efficiency of the power coupling is few per cent and is sensitive to separation between dielectric and slow-wave structure.
Volume 96, 2022
All articles
Continuous Article Publishing mode
Click here for Editorial Note on CAP Mode
© 2021-2022 Indian Academy of Sciences, Bengaluru.