Cambridge 7th to 9th September
article posted 21 Mar 2015
Stuart Reid is a Reader and Royal Society Industry Fellow at the University of the
West of Scotland and is a member of the RSE Young Academy of Scotland.
He obtained his PhD from the University of Glasgow in 2006, developing novel
mirror technology for use in gravitational wave detectors - instruments designed
to observe the most violent events in our Universe, such as black holes colliding.
He has transferred aspects of these precision measurement techniques from
astrophysics into the areas of biology and medicine. This includes co-leading a
breakthrough in promoting bone growth from mesenchymal stem cells and developing
optical filter technology for enhancing the world's fastest, low power CO2
sensors (from Scottish company, GSS Ltd) for capnography - specifically focusing on
monitoring exhaled CO2 during anesthesia.
Protective infrared antireflection coating for chalcogenide glass
Des Gibson, Shigeng Song, Stuart Reid*
SUPA, Institute of Thin Films, Sensors & Imaging,
University of the West of Scotland, Paisley, PA1 2BE, UK
This paper describes optical, durability and environmental performance of a durable
anti-reflection coating. The coating has been demonstrated on germanium, zinc selenide
and chalcogenide infrared material.
The material is deposited using a novel pulsed DC magnetron sputtering technique,
offering significant advantages over conventional evaporation processes for durable
infrared coatings such as plasma enhanced chemical vapour deposition. The sputtering
process is "cold", making it suitable for use on low temperature infrared materials such
as chalcogenide glass. Moreover, the drum format provides a more efficient loading for
high throughput production.
The sputtering process provides a combination of high current densities with ion energies
in the range ~30eV creating optimum thin film growth conditions. As a result the films
are dense, spectrally stable, super-smooth and low stress. Films incorporate low hydrogen
content resulting in minimal C-H absorption bands within critical infrared passbands such
as 3 to 5um and 8 to 12um.
Environmental and durability levels are shown to be suitable for use in harsh external