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Centre for Photonic Devices and Sensors


Transparent Conductors(TC) for Middle Infrared(Mid-IR) liquid crystal spatial light modulators(LC-SLM)


In the Mid-IR(λ = 2 to 5 μm) range, LC-SLMs can offer a low-cost, non-mechanical and compact alternative to the gimbaled mirrors used currently for Mid-IR laser beam-steering. Unfortunately typical indium tin oxide (ITO) TC layers have a transmittance < 20% for Mid-IR wavelengths. Ni UTMFs and CVD monolayer graphene are proposed as an alternative. Transmissive BL-037 LC cells with a maximum phase shift of 3π at λ=2.3 μm were assembled with both materials as TCs on sapphire, with the graphene performing considerably better: Transmittance of 81.1% and contrast ratio of 50.7. LCOS implementation and novel device architectures will be investigated.


Introduction of CPDS

Centre for Photonic Devices and Sensors (CPDS) is in the Photonics area of the Electrical Engineering Division, with a research focus embracing photonic and sensing devices, functional materials and their integration at system level.

We aim to address future societal needs with new system functionalities through invention of novel device architectures based on in-depth understanding of basic material properties.

There is a wide range of activities within the group, including phase-only holography and its applications, high brightness multi-stable colour reflective displays, tuneable dielectric materials and devices for radio frequencies, liquid crystal on silicon (LCOS) device development, and novel sensors.

As well as conducting highly focused studies, we also specialise in the development of demonstrators for business exploitation and commercialisation. This is facilitated by multi-disciplinary expertise within the group and by our highly experienced team approach. Some of the outcomes from the group have been successfully transferred to our industrial collaborators for production.