Investigation on laser-induced effects in nanostructure fabrication with laser-irradiated scanning tunneling microscope tips in air ambient

Z. H. Mai, Y. F. Lu, W. D. Song, W. K. Chim

Research output: Contribution to journalConference article


In this paper, we report our investigation on the kinetics of nanostructure fabrication on gold films and on H-passivated Ge surfaces. The relationship between the current and the tip-sample distance of the STM junction was measured for both gold films and H-passivated Ge surfaces. The tip-sample distance for gold films under a electrochemically etched W tip is approximately 2 nm, while that for H-passivated Ge sufaces is more than 27 nm. The thermal expansion length of the tip under laser irradiation was calculated. From the comparison of the thermal expansion length and the tip-sample distance, we can reach the conclusion that for gold films, thermal mechanical indention is the primary reason of nanostructure formation, while for H-passivated Ge surfaces, optical enhancement is the only reason.

Original languageEnglish (US)
Pages (from-to)J381-J386
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - Dec 1 2000
EventLaser-Solid Interactions for Materials Processing - San Francisco, CA, United States
Duration: Apr 25 2000Apr 27 2000


ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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