
Isotropic etching of Si substrate
Results of selective isotropic etching of the Si substrate by xenon fluoride (XeF₂) etching apparatus while leaving a circular silica film on top.
Photo courtesy of Keio University
Results of selective isotropic etching of the Si substrate by xenon fluoride (XeF₂) etching apparatus while leaving a circular silica film on top.
Photo courtesy of Keio University