AI data centers are running into a new constraint: copper. As clusters scale, the copper cables linking GPUs and switches are hitting limits on distance, bandwidth, heat and power.
To move past this “Copper Wall,” the industry is shifting to photonics — using light instead of electricity to move data. Silicon photonics, optical interconnects and co‑packaged optics are moving from niche to necessary in next‑generation AI infrastructure.
Almost none of that works without ultra‑high‑purity fused silica glass. This first article in our 4‑part “Photonics & Fused Silica Glass 101” series explains why that matters and where Homerun fits.
From Copper Wires to Light
In modern AI data centers, the question isn’t just “How fast is one chip?” It’s “How efficiently can thousands of chips talk to each other?”
Copper struggles because:
- High‑speed signals fade quickly over distance.
- Pushing more data increases power use and heat.
- Physical size and thermal issues limit how densely systems can be built.
Photonics addresses this by moving bits as light through glass or optical waveguides instead of as electrical signals through copper. That is why large technology companies are investing heavily in silicon photonics, optical interconnects and co‑packaged optics for AI networks.
The Quiet Foundation: Fused Silica Glass
When investors hear “photonics,” they usually think about chips and lasers. But these systems depend on a specific class of glass.
Ultra‑high‑purity fused silica is critical in:
- Semiconductors – lithography optics, precision windows, wafer handling.
- Photonics and optical interconnects – waveguides, fibers, certain substrates and optical assemblies.
- Advanced electronics – demanding environments where low loss and stability matter.
Fused silica stands out because it combines:
- Extreme purity and low optical loss.
- High transmission from deep UV to IR.
- Low thermal expansion and high thermal shock resistance.
Producing this material is difficult and often expensive. Traditional synthetic routes use chemical precursors and complex, energy‑intensive reactors, and supply is concentrated in a small number of large producers. As demand from chips, photonics and fiber grows, cost, ESG profile and security of supply are becoming more important questions.
Where Homerun Fits In
Homerun’s silica platform starts with the Santa Maria Eterna (SME) silica sand project in Bahia, Brazil — a high‑purity, low‑iron resource that independent testing has confirmed as suitable feedstock for fused silica production.
To unlock more value from this resource, Homerun has funded a research and development program with UC Davis, led by Professor Subhash H. Risbud, a long‑time pioneer in silica photonics. So far, this collaboration has delivered several key bench‑scale testing results and intellectual property:
- Femtosecond laser purification UC Davis used a femtosecond laser–based thermal process to purify raw SME silica sand to ultra‑high purity (+99.99% SiO₂) without chemical reagents and without traditional mechanical or chemical purification steps.
- Patent application for high‑purity silica sand Homerun and UC Davis have filed a patent application describing a femtosecond laser ablation process that raises purity from 99.75% to +99.99% by significantly reducing impurities such as Ti, Ca, Mg and Fe, again without hazardous chemicals.
- Fast Joule Heating (FJH) to silicon carbide Homerun and UC Davis Materials Science and Engineering have successfully synthesized Silicon Carbide (SiC) with proprietary methods involving electrically generated heat and energy using Homerun’s raw Belmonte silica sand and Bahia Graphite Corporations (BGC) raw graphite from Bahia, Brazil.
- Fast Joule Heating (FJH) to fused silica glass Most recently, UC Davis produced fused silica glass directly from SME silica sand using a one‑step thermoelectric Fast Joule Heating process. In a “tube‑within‑tube” setup with a conductive medium, the system reaches around 2,000 °C, above silica’s melting point and converts sand to fused silica glass in seconds, using only electric power and no reagents.
The plan now is to move from small‑scale experiments to larger‑scale testing using off‑the‑shelf equipment, to see if FJH can become a practical production route. These results are at the R&D stage and not yet independently verified, but they demonstrate a credible, IP‑backed path toward cleaner, potentially more flexible fused silica production from natural silica.
Why This Matters for Shareholders
Our goal with this series is to explain why we are doing this work, not to make near‑term promises.
If photonics continues to scale as a solution to AI’s copper bottleneck, demand for high‑purity fused silica and specialty optical glass is likely to grow. At the same time, customers are looking more closely at ESG performance, cost and resilience of their materials supply chains.
Homerun’s long‑term strategy is to:
- Use our high‑quality SME silica resource as a platform.
- Develop patent‑protected processes that transform that resource into ultra‑pure silica and fused silica glass without hazardous chemicals.
- Position this capability alongside our solar glass strategy in markets where silica‑based materials are central to the energy transition and advanced electronics.
There are still important technical, scaling and commercial steps ahead, and there is no guarantee our R&D will yield commercial processes or products. But we believe that building expertise at this materials level is one of the best ways to potentially create long‑term leverage for our shareholders.
What’s Next
In the remaining three parts of this series, we will cover:
- Part 2 – What Makes Fused Silica Glass So Special?
- Part 3 – Inside Homerun’s UC Davis R&D: From Sand to Fused Silica
- Part 4 – From R&D to Opportunity: What Fused Silica Could Mean for Homerun Shareholders
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