A Remarkable Leap in Light Control
In a major breakthrough in photonics, researchers at the University of Warsaw have successfully trapped infrared light inside a layer just 40 nanometers thick—more than 1,000 times thinner than a human hair. This extraordinary achievement could pave the way for a new generation of faster, smaller, and more energy-efficient optical devices.
How Scientists Made It Possible
The team created a nanoscale structure known as a subwavelength grating, built from a special semiconductor material called molybdenum diselenide (MoSe₂). This material has a very high refractive index, meaning it slows down light far more effectively than conventional materials such as glass or silicon. Because of this unique property, the researchers were able to confine infrared light within an extremely thin layer without losing efficiency.
Turning Infrared Light Into Visible Blue Light
What makes this discovery even more impressive is its ability to significantly boost third harmonic generation—a process in which infrared light is converted into visible blue light. The trapped light intensifies this effect dramatically, making the conversion process more than 1,500 times stronger compared to a flat layer of the same material. This advancement may prove highly useful in optical communication systems, advanced sensors, and future photonic chips.
A Step Toward Real-World Applications
The researchers also addressed a major production challenge by using molecular beam epitaxy (MBE), a scalable semiconductor manufacturing technique. This allowed them to create large, uniform ultra-thin films suitable for practical technological use, bringing this innovation closer to commercial applications.
Why This Matters
As conventional electronics approach their physical limits, photonics is emerging as a promising alternative. By using light instead of electrons to carry information, future devices could become much faster and significantly smaller. This breakthrough from the University of Warsaw marks an important step in that direction.
