From Infrared to Visible
Why the next generation of chips may depend on light we can finally see
We Built on Invisible Light
Look at the screen in front of you. The images are visible, sharp, immediate. But the path they travelled was completely dark. For decades, we have built a global nervous system on a spectrum our eyes cannot perceive. The internet, data centers and modern chips all rely on infrared light—silent, efficient and invisible. It has been the foundation of the digital world. That foundation is now beginning to shift.
Most of what we call “digital” is, in reality, optical. Data moves as pulses of light through fiber. Inside advanced chips, photonic structures guide those signals with increasing precision. But almost all of it happens in infrared wavelengths, far beyond human perception.
“Infrastructures are like languages: once everyone speaks one, it’s hard to switch, even if a better one comes along.”
Brian Arthur, economist and technologist
Infrared became dominant for a simple reason: it works. It travels long distances with minimal loss. It scales efficiently. And once the infrastructure was in place, everything—from telecom networks to chip design—aligned around it.
Technology rarely chooses the perfect solution. It scales the one that works first.
Infrared was about distance. Blue light is about detail.
The Limits of an Invisible System
For a long time, that was enough. The role of chips and networks was clear: move data as fast and as reliably as possible. And infrared light did that exceptionally well. But the role of technology is changing.
Today’s systems are no longer just transporting information. They are expected to sense, interpret and interact with the physical world. Precision matters as much as speed. And this is where infrared begins to show its limits. It is light designed to travel—not to observe.
Enter Blue Light
Blue light introduces a different set of possibilities. Its shorter wavelength allows for smaller structures, finer control and higher resolution. It interacts with matter in ways infrared cannot.
A simple analogy helps. Infrared is like a thick marker—ideal for covering large surfaces quickly. Blue light is a precision pen—capable of drawing lines at microscopic scale.
“Blue light is not just a different color; it’s a different scale of precision. Its shorter wavelength allows us to manipulate matter where infrared simply cannot reach.”
Kevin Williams, Director, Institute for Photonic Integration (TU/e)
Where infrared built infrastructure, blue light begins to build instruments.
From Data to Reality
This marks a deeper transition. From
moving data to understanding the physical world
“We are moving from an era where we used light to connect computers, to an era where we use light to sense the world.”
Ton Backx, CEO, PhotonDelta
This shift is already visible in emerging applications:
- biosensors that detect molecules with extreme sensitivity
- systems that measure and respond in real time
- interfaces that move closer to human perception
“The internet gave us a brain for the planet; photonics is now giving it eyes.”
Eelko Brinkhoff, CEO, Tyndall National Institute
The first generation of photonics connected systems. The next may allow them to see.
A Different Kind of Craft
This transition demands something different from technology. Not just scale. But precision. Not just speed. But control over light at the nanoscale. It also highlights a different kind of technological culture.
Where much of the digital world has been driven by platforms and scale, photonics is shaped by materials, structures and engineering craft.
This is where Europe holds a distinctive position. Rather than dominating consumer platforms, it has historically built the systems and machines that make them possible—from advanced lithography to high-precision engineering. Blue light photonics fits that tradition.
“The next revolution in chips won’t be won by those who make them faster, but by those who make them smarter using light. This is Europe’s window of opportunity.”
Lucilla Sioli, Director for AI and Digital Industry, European Commission
Not a sudden disruption. But a shift in the underlying layer.
Closing
The first phase of the digital world was about connection. Everything had to move faster, further, and more efficiently.
The next phase changes the question. Not just: how do we move data? But: how do we understand the world?
You don’t change a chip only by making it faster. Sometimes, you change it by changing the light.
In the next article, we explore how this blue light is captured and controlled on a chip smaller than a speck of dust.
This article is part of The Color of the Next Chip, a series on how photonics is shifting chips from data transport to interaction with the physical world.
📸 Credit
Image generated with AI
✍️ Caption
Minimalist illustration of the transition from infrared to visible light on chip-level architecture, highlighting precision and control in next-generation photonics.
