POWAG

The ability to control light and the properties of matter in small (nanometer) regions of space and over short (femtosecond) time intervals becomes more important as electronic and optical devices are pushed to the limits. Recent progress in the fabrication of artificial materials with refractive index structured at the submicron scale, and in high power ultra-short pulse lasers, is opening up new frontiers in the physics and technology of light-matter interactions. The two fields are sometimes inextricably linked. Short pulse lasers can themselves be used to pattern materials on the nanometer scale in 3D, and microstructured materials such as photonic crystal fibres are being used to manipulate and transmit the ultra-short pulses. Many new applications are emerging, for example efficient generation of coherent UV and X-ray radiation from few-cycle optical pulses in noble gases and stimulated Raman scattering at ultra-low threshold powers in molecular gases such as hydrogen. Related..