The central processing unit (CPU) is the brain of any smart device, but this extremely tiny chip cannot work alone; it needs a base or board to mount on in order to connect with the motherboard, which is known as "substrate." For decades, the industry has used substrates made from organic materials (similar to reinforced plastic), but with the increasing requirements of artificial intelligence and the massive miniaturization of transistors, these organic materials began to collapse and twist under high temperatures, limiting companies' ability to produce faster and more powerful processors. The radical solution that is upending this industry today is the use of "glass substrates."

In a report on the future of semiconductors by Wired magazine, it was explained that major tech companies are pouring billions of dollars into transitioning from organic materials to glass in processor packaging. Glass has exceptional mechanical and physical properties; it does not bend or twist when exposed to the extreme heat of the processor, and it is incredibly hard, allowing engineers to drill much thinner electrical pathways and wires than those found in current substrates. This innovation means that we can place a much larger number of tiny chips (Chiplets) very close together on one glass board, which increases the speed of communication between them and doubles overall performance.

Advanced Engineering Properties of Glass Substrates

The use of glass in the electronics industry requires extreme precision and complex manufacturing tools. The process involves the following engineering steps:
1- Micro laser processing: Highly advanced laser beams are used to create microscopic holes (Microvias) in the glass plates without causing cracks, which is a very difficult process due to the natural fragility of glass.

2- Integration of electrical and optical signals: Thanks to the purity and transparency of glass, electrical signals can pass through copper-filled holes while allowing optical signals (lasers) to pass through to exchange data at speeds that exceed metal wires.
3- High-Density Packaging: Processors, memory chips, and graphics cards are mounted side by side on this perfectly flat glass substrate, reducing the physical distance between them and minimizing wasted energy consumption.

The future impact on computers and artificial intelligence

This leap in materials engineering will directly affect the power of the devices we use. Glass pillars will allow for the manufacturing of giant AI chips that cannot be made today with organic materials, which will accelerate the development of deep learning models. For consumers, this means laptops and smartphones that don’t overheat as much, and batteries that last longer thanks to more efficient energy transfer. Glass, an ancient material that has accompanied humanity for thousands of years, is being reinvented today as a cornerstone of high-performance computing in the future.