updated 10:58 PM UTC, Nov 17, 2019
A spiral waveguide
A photonic chip integrated to a PCB
Coupling light into a spiral waveguide
A wide-band MMI

CORNERSTONE is an open access Silicon Photonics rapid prototyping foundry. The technology platform utilises industrially-compatible tools (e.g. deep-UV projection lithography), to enable seamless scaling-up of production volumes, whilst also retaining device level innovation capability using high-resolution lithography (e-beam) and versatile processes.


CORNERSTONE offers 3 different silicon-on-insulator platforms (220 nm Si / 2 µm BOX, 340 nm Si / 2 µm BOX and 500 nm Si / 3 µm BOX) via a multi-project-wafer (MPW) service, enabling a plethora of applications including datacom, LIDAR, mid-infrared sensing etc. The unique hybrid processing (DUV projection lithography and e-beam lithography) capability renders the CORNERSTONE platform attractive to both academia and industry, and is able to mimic advanced industrial processes.


The up to TRL 5 technology platform is a collaboration between the Universities of Southampton, Glasgow and Surrey in the UK, with the majority of the processing taking place in the Optoelectronics Research Centre’s cleanrooms at the University of Southampton, where a 248 nm Nikon Scanner is installed. Lower TRL opportunities are also available for researchers and innovators to test experimental designs.


Bespoke fabrication batches are available upon request. If you have any queries you can email us at This email address is being protected from spambots. You need JavaScript enabled to view it..


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


Live Call Announcement


CORNERSTONE users are invited to submit designs to the sixteenth call with a platform of 340 nm SOI ...

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Future Calls

MPW Schedule Updated for 2020

The MPW schedule for calls #16 through to #20 has been updated for 2020*. *MPW schedule subject to change.

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OCP Future Technologies Symposium Award

CORNERSTONE win Future Technologies Symposium award at OCP Regional Summit...

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