Ultrashort Laser Pulses Slice Diamond Along {100} Crystal Planes for Next-Generation Electronics

Researchers at Chiba University have successfully sliced single-crystal diamond along the {100} crystal plane using ultrashort laser pulses. The breakthrough, announced on November 2, 2026, overcomes a fundamental material limitation that has long stalled diamond semiconductor manufacturing.[2][4]

Diamond is widely considered the ultimate semiconductor material, capable of operating at voltages and temperatures that would instantly destroy conventional silicon. However, building these advanced devices requires flat, large-area wafers cut precisely along specific atomic orientations.[2][3]

The fundamental problem lies in the crystal structure of diamond itself. The material naturally cleaves along the {111} plane, which is not ideal for most electronic applications. The {100} plane is highly preferred for fabricating power devices, but forcing a break along this axis typically shatters the crystal.[1][2]

The electrical properties of the {100} plane make it uniquely suited for managing high currents. Devices built on this orientation exhibit significantly lower electrical resistance and higher electron mobility than those constructed on the {111} plane, making the {100} surface mandatory for commercial power applications.[1][4]

"The {100} plane is the most important surface for diamond device applications, but cleaving along this plane has been considered nearly impossible," said lead researcher Hirofumi Hidai at Chiba University. His team's approach abandons mechanical force entirely, relying instead on highly focused light.[2][3]

The mechanism of laser slicing

The new technique utilizes ultrashort laser pulses, firing bursts of light that last only a few femtoseconds. When focused precisely inside the diamond, these pulses create a microscopic layer of amorphous carbon, fundamentally altering the crystal lattice at a specific depth.[1][2]

The researchers utilized a titanium-sapphire laser system emitting pulses at a wavelength of 800 nanometers. By tightly focusing these pulses through a specialized objective lens, they achieved the extreme optical intensity required to trigger multiphoton absorption, a non-linear process that modifies the diamond without heating the surrounding area.[1]

By scanning the laser across a predetermined depth, the researchers generate a continuous grid of these modified zones spaced just 15 micrometers apart. This grid acts as a highly controlled fault line, artificially weakening the diamond exactly where the cut needs to happen without propagating cracks.[1][2]

Once the modified layer is established, the team applies a specialized tungsten needle to the edge of the crystal. A slight mechanical pressure is all that is required to propagate a clean fracture along the laser-defined {100} plane, separating the wafer from the bulk substrate.[1][2]

The precision of this method is unprecedented in diamond processing. The resulting wafers exhibit a surface roughness of just 3 to 5 micrometers, requiring significantly less polishing than those produced by traditional mechanical sawing. This efficiency translates directly to lower manufacturing costs and higher yields.[1][5]

Overcoming synthetic growth limits

High-pressure high-temperature methods can grow high-quality synthetic diamonds, but they are typically limited to sizes of a few millimeters. Chemical vapor deposition allows for much larger crystals, but these larger blocks are notoriously difficult to cut without introducing fatal structural defects.[1][4]

Traditional mechanical cutting techniques, such as wire sawing, waste a massive amount of the precious material as dust. A standard wire saw can consume up to 100 micrometers of diamond per cut, which is often thicker than the desired wafer itself.[2][4]

The laser slicing method eliminates this kerf loss entirely. By converting a microscopic plane of diamond into amorphous carbon, the technique allows manufacturers to extract multiple thin wafers from a single synthetic diamond block with near-zero waste, maximizing the output from every growth cycle.[2][5]

"By minimizing material loss and reducing the need for extensive post-processing, this technique drastically lowers the cost of diamond substrates," the Chiba University research team noted in their publication. The process fundamentally changes the economics of diamond manufacturing.[1][2]

Applications in power and quantum devices

The immediate beneficiaries of this technology will be the developers of next-generation power grids. Diamond-based transformers could shrink the size of electrical substations by 90 percent while virtually eliminating the 5 to 10 percent of energy currently lost as heat during high-voltage conversion.[4][5]

Electric vehicles also stand to gain significantly from diamond power electronics. Replacing silicon carbide inverters with diamond components could reduce the cooling system requirements in an electric car by half, simultaneously extending the vehicle's driving range and reducing its overall weight.[4]

Beyond power electronics, large-area diamond wafers are critical for the emerging field of quantum computing. Nitrogen-vacancy centers in diamond crystals can operate as stable qubits at room temperature, bypassing the need for the massive cryogenic cooling systems required by current superconducting quantum processors.[3][4]

Scaling these quantum systems requires large, defect-free diamond surfaces to host millions of qubits in a precise array. The ability to reliably slice chemical vapor deposition diamond along the {100} plane provides the exact structural canvas quantum engineers have been waiting for to build scalable architectures.[1][3]

The research team is now working to automate the laser scanning process for industrial-scale production. They aim to demonstrate the continuous slicing of wafers up to 50 millimeters in diameter by the end of 2027, a critical threshold for integration into commercial semiconductor foundries.[2][4]

The successful commercialization of this slicing technology will shift diamond from a niche laboratory material to a foundational component of global infrastructure. The transition promises to unlock the full potential of wide-bandgap semiconductors, reshaping how the world generates, distributes, and processes electrical power.[2][5]