Excitations of precursor molecules by different laser powers in laser-assisted growth of diamond films

Zhi Qiang Xie, Xiang Nan He, Wei Hu, Thomas Guillemet, Jong Bok Park, Yun Shen Zhou, Jaeil Bai, Yi Gao, Xiao Cheng Zeng, Lan Jiang, Yong Feng Lu

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Excitations of precursor molecules by different laser powers in laser-assisted growth of diamond films using a wavelength-tunable CO2 laser were studied. The wavelength of the CO2 laser was tuned to 10.532 μm to match a vibration mode of a precursor molecule, ethylene. The density of the incident laser power was adjusted to modify diamond crystal orientation, optimize diamond quality, and achieve high-efficiency laser energy coupling. It was observed that at incident laser power densities between 5.0 × 103 and 1.0 × 104 W/cm2, (100)-faceted diamond crystals were grown uniformly in the center areas of the diamond films. Higher incident laser powers, although further promoted growth rate, suppressed the uniformity of the diamond (100) facets. Best diamond quality was obtained within a laser power density range of 5.0 × 10 3 to 6.7 × 103 W/cm2, whereas the highest energy efficiency was achieved within a laser power density range of 3.3 × 103 to 6.7 × 103 W/cm2. The effects of the resonant laser energy coupling were investigated using optical emission spectroscopy.

Original languageEnglish (US)
Pages (from-to)4928-4933
Number of pages6
JournalCrystal Growth and Design
Volume10
Issue number11
DOIs
StatePublished - Nov 3 2010

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Excitations of precursor molecules by different laser powers in laser-assisted growth of diamond films'. Together they form a unique fingerprint.

  • Cite this

    Xie, Z. Q., He, X. N., Hu, W., Guillemet, T., Park, J. B., Zhou, Y. S., Bai, J., Gao, Y., Zeng, X. C., Jiang, L., & Lu, Y. F. (2010). Excitations of precursor molecules by different laser powers in laser-assisted growth of diamond films. Crystal Growth and Design, 10(11), 4928-4933. https://doi.org/10.1021/cg1010083