Etching of crystalline Si in Cl2 atmosphere by means of an optical fiber tip

G. Wysocki, S. T. Dai, T. Brandstetter, J. Heitz, D. Bäuerle

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


We report experiments on laser-induced chemical etching of silicon in chlorine atmosphere using a near-field optical configuration. Crystalline (100) Si surfaces were locally illuminated in 300 mbar Cl2 through a tapered fiber tip. In most of the experiments, we used UV argon ion laser lines around 350 nm for illumination. The etched samples were analyzed by means of atomic force microscopy. Patterns with a width of 140 nm at full width half maximum and a vertical etch rate of the order of 15 nm/s have been achieved. Comparison of etching with a visible wavelength at intensities that cannot cause surface melting shows that the etching is primarily a photophysical process.

Original languageEnglish (US)
Pages (from-to)159-161
Number of pages3
JournalApplied Physics Letters
Issue number2
StatePublished - Jul 9 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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