Undercut (etching)

Undercuts from etching (microfabrication) are a side effect, not an intentional feature. Undercuts from etching can occur from two common causes. The first is over etching, which means the etchant was applied too long. The second is due to an isotropic etchant, which means the etchant etches in all directions equally. To overcome this problem an anisotropic etchant is used.[1]

  1. An isotropic etchant that creates an undercut
  2. An anisotropic etchant leaves no undercut

References
  1. Degarmo, Black & Kohser 2003, p. 897.

Bibliography
  • Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), Wiley, ISBN 0-471-65653-4.
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