Optical Chemical Sensor Systems

1
Optical Chemical Sensor Systems based on
Photosensitive Hybrid Sol-Gel Glass B.D.
MacCraith, S. Aubonnet, H. Barry, C. von
Bültzingslöwen, J.-M. Sabattié, C.S.
Burke Optical Sensors Laboratory - National
Centre for Sensor Research Dublin City University
- Ireland

• 5 Sensor Configurations
• Photosensitive sol-gel glass can be used to
  produce a range of useful sensing configurations,
  e.g. integrated optic structures and arrays of
  sensor spots

Photopatterned array of doped sensor spots
Average ridge thickness of 14.5?m
The fluorescence is captured in each waveguide
and can be observed at the channel output.

• 6 Microsystems (Lab-on-a-chip)
• Major developments in miniaturised sensor systems
  with high levels of integration and
  functionality, e.g. ?-TAS (micro-total-analysis
  systems)
• Key ?-TAS elements include microfluidic channels
  and patterned surfaces
• UV-photolithographic sol-gel materials can be
  used for rapid prototyping, templating of PDMS
  (poly-dimethyl siloxane), and patterning of
  surfaces.

• 7 Conclusions
• UV-curable sol-gel materials combine the
  versatility of the sol-gel process with the
  capabilities of photolithography.
• Tunable doped sensor materials, waveguide sensor
  structures and sensor arrays can be fabricated
  with this process.
• Future work micro-optical sensor chips and
  multi- analyte sensor systems

Silicon substrate
UV-cured sol-gel ridges (50 mm width)
PDMS drop
PDMS micro channels