Flip-chip bonding of an electronic IC to a PIC
Thermal phase shifter in an MZI interferometer
Spiral waveguide

CORNERSTONE is a license free, open source Silicon Photonics rapid prototyping foundry based in the UK. The prototyping platform utilises industrially-compatible deep-UV projection lithography to enable seamless scaling-up to production volumes via your favourite commercial foundry, but also retains device level innovation capability and flexibility in its process flows, making it ideal for researchers to try innovative designs, or to evaluate new photonic circuits. This process flexibility and license free, open access model is what differentiates CORNERSTONE from other foundries.


Currently CORNERSTONE offers 3 different silicon-on-insulator platforms via a multi-project-wafer service. However, in light of market demand for platforms that support additional wavelengths beyond traditional telecoms, CORNERSTONE is delighted to announce 3 exciting new silicon based technology platforms and 2 new integration platforms, all available from the summer of 2021. Find out more.


In addition, CORNERSTONE offers a DUV lithography service, which is currently free-of-charge for UK academics. 


The capabilities of the Silicon Photonics Group at the University of Southampton can be downloaded below.


Live Call Announcement

MPW 19th Call on 500 nm SOI

CORNERSTONE users are invited to submit designs to the nineteenth call with a platform of 500 nm SOI (passives with heaters).

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Future Calls

MPW Schedule Updated for 2020-2021

The MPW schedule for calls #19 through to #27 has been updated for 2020-2021*. *MPW schedule subject to change.

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Contact us


Optoelectronics Research Centre
B53, Highfield Campus
University of Southampton
SO17 1BJ,

We are based on the 3rd floor in the Mountbatten building (B53), Highfield Campus, University of Southampton.

The campus map is available here.