Enhancement of K{sub {alpha}} emission through efficient hot electron generation in carbon nanotubes on intense laser pulse irradiation

Near complete absorption of the energy of intense ultra-short laser pulses (45 fs, intensity {approx}1.6 Multiplication-Sign 10{sup 16} to 2.5 Multiplication-Sign 10{sup 17} W/cm{sup 2}) is observed in carbon nanotubes deposited on a planar molybdenum substrate. The hollow structure of the nanotube...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2012-09, Vol.112 (5)
Main Authors: Chakravarty, U., Arora, V., Naik, P. A., Chakera, J. A., Srivastava, H., Srivastava, A., Kumbhare, S. R., Gupta, P. D., Varma, G. D.
Format: Article
Language:English
Subjects:
CARBON NANOTUBES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DENSITY
ELECTRIC FIELDS
EMISSION
LASER RADIATION
LIGHT TRANSMISSION
MOLYBDENUM
NANOSCIENCE AND NANOTECHNOLOGY
PLASMA DENSITY
PULSED IRRADIATION
PULSES
SUBSTRATES
X RADIATION
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Near complete absorption of the energy of intense ultra-short laser pulses (45 fs, intensity {approx}1.6 Multiplication-Sign 10{sup 16} to 2.5 Multiplication-Sign 10{sup 17} W/cm{sup 2}) is observed in carbon nanotubes deposited on a planar molybdenum substrate. The hollow structure of the nanotube plasma facilitates resonant electric field enhancement during its ionization phase. This resonantly enhanced localized field at a density much larger than the critical density n{sub c} leads to efficient hot electron generation, which results in enhanced K{sub {alpha}} emission of Mo at 17.5 keV. It is observed that for nanotubes, depending on the degree of hollowness, there is an optimum laser intensity for maximum x-ray enhancement compared to a planar uncoated target.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4749575