Are you working hard to finish your design for the Square Peg Challenge? We are giving you two additional weeks to refine, test, and submit your optical system.
Happy designing, and may the best design shine through!
Extended Deadline: June 15th, 2026
The preliminary program for Nonimaging Optics: Efficient Design for Illumination and Concentration XXI in San Diego is now available.
The schedule includes sessions on nonimaging theory, solar concentration and receivers, thermophotovoltaics, radiative cooling, LED optics, illumination applications, and the 2026 optical design competition.
If you want to participate in this program, we will consider post-deadline abstracts through 29 June 2026. These submissions will be considered for the poster session, or for an oral session if space becomes available.
Browse the 2026 conference program.
Did you want to prepare an abstract for the conference but didn’t have enough time? Great news! The abstract submission deadline has been extended to February 17th, 2026.
This gives you a few extra days to finalize and submit your work. Don’t miss this opportunity to be part of our twenty-first Nonimaging Optics conference. Check out the call for papers for full details.
We look forward to receiving your abstract and seeing you in San Diego this August!
Thank you to everyone who joined us for the online minisymposium on December 8, 2025!
All recordings and presentation slides from the symposium are now available on the symposium page. You can watch the invited talks from Martijn Anthonissen, Julius Muschaweck, and Henning Rehn, as well as the introduction to this year’s design competition.
We are excited to announce the launch of our Nonimaging Optics Design Competition 2026 - The Square Peg Challenge! Can you fit a square peg through a round hole?
Your task is to design a reflective optical system that takes all light emitted from a cube-shaped source and guides it into a circular opening. The étendue is perfectly matched, so in theory it’s possible. The only question is: How?
Go to the competition page and start designing today. The submission deadline is June 1st, 2026.
May the best design shine through!
