

Nanofocusing of mid-infrared energy with tapered transmission lines
Mid-infrared radiation allows the analysis of a wide range of different material properties, including chemical composition and the structure of matter1,2. Infrared spectroscopy is therefore an essential analytical tool in many sciences and technologies.
The diffraction limit, however, challenges the study of individual molecules and nanostructures, as well as the development of highly integrated mid-infrared optical devices3. Here, we experimentally demonstrate mid-infrared