Topic: Technology

Researchers at XPANCEO Emerging Technologies Research Center discovered a new material that can be shaped and patterned using only light. They used this material to create a tiny portrait of Albert Einstein.

Nobel Laureate Prof. Konstantin Novoselov from the University of Manchester and the National University of Singapore worked with researchers at XPANCEO Emerging Technologies Research Center to find unusual optical behavior in arsenic trisulfide (As2S3). This material is a type of crystalline van der Waals semiconductor.

Their findings showed that As2S3 can be permanently altered by light and even shaped at the nanoscale using simple continuous-wave (CW) light. This approach avoids the need for costly cleanroom fabrication or advanced femtosecond laser systems.

The study reports an exceptionally large change in refractive index (up to Δn ≈ 0.3), which exceeds the values typically observed in well-known photorefractive materials such as BaTiO3 or LiNbO3.

Materials that respond strongly to light in this way are highly useful because they allow optical functions to be directly written into the material. Instead of relying on multiple mechanical or manufacturing steps, light itself can define how a device handles and directs light.

This capability is important for many everyday technologies. It supports the creation of tiny structures that guide signals in telecommunications systems, enables compact optical components used in sensors and imaging devices, and allows the formation of hologram-like features used in product authentication and security.

In As2S3, the effect is especially powerful at very small scales. The large change in refractive index allows the formation of extremely fine patterns that remain embedded in the transparent material.

These patterns act as unique optical identifiers that are difficult to replicate, making them useful for anti-counterfeiting and traceability applications.

Why It Matters

This technology can be used to create compact optical components for sensors and imaging devices. It also has potential applications in product authentication and security.

Key Facts

• Researchers discovered a new material that can be shaped and patterned using only light.
• The material, arsenic trisulfide (As2S3), is a type of crystalline van der Waals semiconductor.
• The study reports an exceptionally large change in refractive index (up to Δn ≈ 0.3).
• This technology can be used to create compact optical components for sensors and imaging devices.
• It also has potential applications in product authentication and security.

Key Terms

Refractive Index

The measure of how much a material bends or slows light

Implications

This technology can be used to create compact optical components for sensors and imaging devices. It also has potential applications in product authentication and security.