Self-sacrificial surface micromachining using poly(methyl methacrylate)

R. W. Johnstone, I. G. Foulds, M. Parameswaran

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


This paper explains the idea of self-sacrificial surface micromachining. In a self-sacrificial process, there is no distinction between structural and sacrificial layers. Instead, during patterning, an in situ chemical change converts a structural material into a sacrificial material, or vice versa. This greatly increases the design space of a self-sacrificial process when compared to a traditional process with the same number of layers, as all layers can be used simultaneously for both structural and sacrificial purposes. To show the possibility of self-sacrificial surface micromachining, a concrete implementation was developed using poly(methyl methacrylate) (PMMA) as the material. Unexposed PMMA, with a high average molecular weight, was used as the structural material. Exposed PMMA, with a lower average molecular weight, was used as the sacrificial material. The in situ chemical change was caused by deep-UV irradiation at 254 nm.

Original languageEnglish (US)
Article number115012
JournalJournal of Micromechanics and Microengineering
Issue number11
StatePublished - Nov 1 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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