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Title: X-ray enhancement in a nanohole target irradiated by intense ultrashort laser pulses

Abstract

In this paper, we present a comparative study of the laser energy absorption, soft x-ray emission (in the water window region: 2.3-4.4 nm) and hard x-ray emission (in the 2-20 keV range) from planar aluminum and nanohole alumina of 40 nm average diameter, when irradiated by Ti:sapphire laser pulses. The laser pulse duration was varied from 45 to 500 fs, and the focused intensity on the target ranged from {approx}3 x 10{sup 16} W/cm{sup 2} to 3x10{sup 17} W/cm{sup 2}. The x-ray yield enhancement from the nanoholes shows an increased coupling of the laser energy to the target. The effect of laser pulse duration on the x-ray emission was also studied, where a resonance like phenomenon was observed. The laser energy absorption measurements in the nanoholes showed a marginal enhancement in absorption as compared to planar Al. The integrated keV x-ray yield, from nanohole alumina and planar Al, at an intensity of 3 x 10{sup 17} W/cm{sup 2}, was 25 and 3.5 {mu}J, respectively. The results can be explained by considering the hydrodynamic expansion of the laser irradiated structure and field enhancement in the nanoholes.

Authors:
; ; ; ; ; ; ;  [1]
  1. Raja Ramanna Centre for Advanced Technology, Indore 452013 (India)
Publication Date:
OSTI Identifier:
21538136
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 109; Journal Issue: 5; Other Information: DOI: 10.1063/1.3554407; (c) 2011 American Institute of Physics; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALUMINIUM OXIDES; CYCLIZATION; DISTANCE; EMISSION SPECTRA; ENERGY ABSORPTION; EXPANSION; HARD X RADIATION; KEV RANGE; LASER RADIATION; NANOSTRUCTURES; PULSES; SAPPHIRE; SOFT X RADIATION; SPONTANEOUS MUTATIONS; X-RAY SPECTRA; ABSORPTION; ALUMINIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; CORUNDUM; ELECTROMAGNETIC RADIATION; ENERGY RANGE; IONIZING RADIATIONS; MINERALS; MUTATIONS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; SORPTION; SPECTRA; X RADIATION

Citation Formats

Chakravarty, U, Arora, V, Chakera, J A, Naik, P A, Srivastava, H, Tiwari, P, Srivastava, A, and Gupta, P D. X-ray enhancement in a nanohole target irradiated by intense ultrashort laser pulses. United States: N. p., 2011. Web. doi:10.1063/1.3554407.
Chakravarty, U, Arora, V, Chakera, J A, Naik, P A, Srivastava, H, Tiwari, P, Srivastava, A, & Gupta, P D. X-ray enhancement in a nanohole target irradiated by intense ultrashort laser pulses. United States. https://doi.org/10.1063/1.3554407
Chakravarty, U, Arora, V, Chakera, J A, Naik, P A, Srivastava, H, Tiwari, P, Srivastava, A, and Gupta, P D. 2011. "X-ray enhancement in a nanohole target irradiated by intense ultrashort laser pulses". United States. https://doi.org/10.1063/1.3554407.
@article{osti_21538136,
title = {X-ray enhancement in a nanohole target irradiated by intense ultrashort laser pulses},
author = {Chakravarty, U and Arora, V and Chakera, J A and Naik, P A and Srivastava, H and Tiwari, P and Srivastava, A and Gupta, P D},
abstractNote = {In this paper, we present a comparative study of the laser energy absorption, soft x-ray emission (in the water window region: 2.3-4.4 nm) and hard x-ray emission (in the 2-20 keV range) from planar aluminum and nanohole alumina of 40 nm average diameter, when irradiated by Ti:sapphire laser pulses. The laser pulse duration was varied from 45 to 500 fs, and the focused intensity on the target ranged from {approx}3 x 10{sup 16} W/cm{sup 2} to 3x10{sup 17} W/cm{sup 2}. The x-ray yield enhancement from the nanoholes shows an increased coupling of the laser energy to the target. The effect of laser pulse duration on the x-ray emission was also studied, where a resonance like phenomenon was observed. The laser energy absorption measurements in the nanoholes showed a marginal enhancement in absorption as compared to planar Al. The integrated keV x-ray yield, from nanohole alumina and planar Al, at an intensity of 3 x 10{sup 17} W/cm{sup 2}, was 25 and 3.5 {mu}J, respectively. The results can be explained by considering the hydrodynamic expansion of the laser irradiated structure and field enhancement in the nanoholes.},
doi = {10.1063/1.3554407},
url = {https://www.osti.gov/biblio/21538136}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 5,
volume = 109,
place = {United States},
year = {Tue Mar 01 00:00:00 EST 2011},
month = {Tue Mar 01 00:00:00 EST 2011}
}