Our Silicon Nitride platform will be launching in...

Coming soon

Mask upload form

Please fill out this form prior to submitting your .GDSII file. Once this form is completed, you will receive login details to the mask uploading module within 24 hours, where you can upload your file to be accessed by the CORNERSTONE team.

CORNERSTONE is a license free, open source Silicon Photonics rapid prototyping foundry based in the UK. Our open access and license free model differentiates us from other foundries. Our prototyping platform uses industry-compatible, deep-UV projection lithography meaning you can seamlessly scale up production volumes via your favourite commercial foundry .The platform retains device-level innovation capability and flexibility in its process flows, making it the perfect choice for researchers who want to try out innovative designs or evaluate new photonic circuits. 


We currently offer 3 different silicon-on-insulator platforms via a multi-project-wafer service with new platforms coming soon! 


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



CORNERSTONE are launching 3 exciting new silicon based technology platforms and 2 new integration platforms over the coming months. Full design rules for the SiN platform are live and if you would like to discuss any of the new platforms with the team please contact us


More information about the all the platforms coming to CORNERSTONE can be found in the file below.



The CORNERSTONE team have won ~£1.5M in funding from the UK Engineering and Physical Sciences Research Centre (EPSRC) to expand the capabilities offered by the service.

In CORNERSTONE 2, the team will develop 6 new silicon based technology platforms for researchers to design their photonic integrated circuits. The platforms extend the supported wavelength range into both the visible wavelengths and mid-infrared wavelengths, enabling a plethora of applications including LIDAR, lab-on-a-chip sensing and more. The 6 new platforms comprise:

  1. Flip-chip bonding of electronic circuits to photonics
  2. Pick and place of laser dies to facilitate on-chip light sources for multiple applications
  3. A high confinement Silicon Nitride photonics platform with thickness up to 1 µm
  4. An undercut Silicon Photonics platform to facilitate photonics circuits that operate at wavelengths up to 4 µm
  5. A Germanium-on-Silicon platform for photonics circuits that operate at wavelengths up to 12 µm
  6. Deep-UV projection lithography service

More information about the platforms can be found in the file below.

CORNERSTONE 2 is a collaborative project between teams led by Professor Graham Reed at the University of Southampton and Professor Marc Sorel at the University of Glasgow. The Glasgow team will be responsible for integrating light sources onto silicon photonics chips, a major step in the commercialisation of silicon photonics. The Southampton team will be responsible for the remaining platforms on 200 mm substrates, utilising the deep-UV projection lithography capability installed in the first CORNERSTONE project.

The project PI, Professor Graham Reed, Deputy Director of the ORC and Professor of Silicon Photonics said: “I'm delighted that the EPSRC are supporting the expansion of CORNERSTONE. I believe that it will enable researchers to have significant impact in a variety of silicon-based platforms.”

Professor Harold Chong, project co-investigator and Professor of Electronic Engineering in the Electronics and Computer Science department said: “The flexibility of the processes and the variety of the platforms available in CORNERSTONE 2 gives researchers numerous options when designing optoelectronics devices and systems.”

The project will officially commence on 1st March 2020 and run for 2-years. UK academics will have the opportunity to access the new platforms free-of-charge for the final 6 months of the project, with access opportunities for international researchers available for a charge during this final 6 month period and beyond. Throughout the CORNERSTONE 2 project, the team will be consulting the community to determine if they would like to see CORNERSTONE become an EPSRC National Research Facility (NRF).

The current SOI capability will continue to operate as it has done for the previous years. All users will be charged at the rates advertised on the Schedule & Cost page.

If you are interested in any of the above platforms, please email This email address is being protected from spambots. You need JavaScript enabled to view it. to find out more.


On this page you can download our standard Non-Disclosure Agreement (NDA) and Terms & Conditions. If you have any queries, contact This email address is being protected from spambots. You need JavaScript enabled to view it..

Non-Disclosure Agreement (NDA)

Note: An NDA is optional. CORNERSTONE does not require an NDA to be signed.

If you intend to submit commercially sensitive designs to CORNERSTONE then both parties are required to sign an NDA. This MUST be stated at the Expression of Interest (EoI) stage, at least 6 weeks before the mask submission deadline, so that the necessary procedures can be initiated. For an expedited process, it is essential that the NDA is accepted in its current form, which you can download below.

If any changes are required, we cannot guarantee that they will be complete before the mask submission deadline.

There are no deadlines for completion of the NDA (if applicable) for bespoke fabrication batches.

Terms & Conditions

Note: All CORNERSTONE partners MUST agree to the Terms & Conditions when submitting a mask design.

The CORNERSTONE Terms & Conditions can be downloaded below.