Sensitive detection of molecules

Hanieh Fattahi is a research group leader at the Max Planck Institute for the Science of Light. In a research project with her team from the Max Planck Institute of Quantum Optics in Garching, Germany, she has succeeded to develop a sensitive instrument to measure concentration of molecules.

When near-infrared light interacts with molecules, it causes them to vibrate. The vibrating molecules emit coherent light at highly characteristic wavelengths. The new technology uses femtosecond pulses (an inconceivably short time unit of 10⁻¹⁵ seconds) to detect these emitted wavelengths by molecules.

As a first demonstration, the researchers used their laser source to study water molecules. "For the first time, we were able to detect the complex electric field of light absorbed by water molecules in the near infrared spectral range," Fattahi says.

Based on these results, Hanieh Fattahi expects to use the developed laser architecture to perform spectroscopic analyses of molecular vibrations in the femtosecond range and how to apply this technique to imaging.

COMPAMED-tradefair.com; Source: Max Planck Institute for the Science of Light