Nano funnels can be used to efficiently concentrate light. Scientists belonging to the Max Planck Institute of Quantum Optics in Germany, Georgia State University in the USA and the Korea Advanced Institute of Science and Technology have used a three dimensional silver nano funnel to concentrate infrared light pulse energy and have generated extreme ultraviolet (EUV) light flashes from the concentrated energy.
Pulsed EUV light is used in the field of laser physics for exploring atoms and molecules. The novel technology can enable measurement of electron movement with high temporal and spatial resolution.
The scientists used the three dimensional silver nano funnel and employed the high-harmonic generation process to convert infrared spectral range femtosecond (fs) laser pulses to EUV fs light flashes. This resulted in a EUV light source with a low 20 nm wavelength. The EUV light flashes repeated 75,000,000 times in a second and lasted for a couple of fs.
The silver nanofunnel containing xenon gas has a 100 nm wide opening, which prevents infrared light having wavelengths of more than 100 nm from passing through. But it allowed the EUV light with 20 nm wavelength.
Attosecond light flashes are being used for exploring electron motion. Traditional techniques allow repetition only a few thousand times in a second. The nanofunnel may enable repetition at higher rates. In surface electron spectroscopy, repetition rates play a major role in the usage of EUV pulses.
The combined usage of nanotechnology and laser technology can help record movies in the attosecond-nanometer domain of ultrafast electron motion with high spatial and temporal resolution.