  We report on the integration of small-scale optical components into silicon
wafers for use in atom chips. We present an on-chip fibre-optic atom detection
scheme that can probe clouds with small atom numbers. The fibres can also be
used to generate microscopic dipole traps. We describe our most recent results
with optical microcavities and show that single-atom detection can be realised
on an atom chip. The key components have been fabricated by etching directly
into the atom chip silicon substrate.
