The steering of electrons with the electric field of well-controlled femtosecond laser pulses makes it possible to resolve atomic processes on an attosecond time scale.
Metal tip irradiated with a laser pulse. Foto: Thorsten Naeser, MPQ
Typical time structure of the electric field of femtosecond laser pulses. The maximum of the oscillation of the carrier wave (blue) depends on the phase relative to the maximum of “the envelope” (green). In the left pulse the phase difference amounts to 180 degree whereas in the right pulse it is 0 degree. Graphics: MPQ
The independent Research Group Ultrafast Quantum Optics of Dr. Peter Hommelhoff has now applied this method to solid state surfaces, i.e., to extremely sharp metal tips (Nature, 07 July 2011) This way the scientists were able to show that comparable small laser intensities are sufficient to steer the emission of electrons from the metal tip with the phase of the optical cycle.
The modulation observed in the resulting energy spectrum can be explained with the occurrence of a phase dependent coherent interference of electron wave packets, in agreement with numerical calculations. The new technique is of interest not only for fundamental research. The experimental device represents a simple, compact and very sensitive system for the precise measurement of the phase of laser pulses and could lead to the development of ultrafast optical transistors.
In the experiment a tungsten tip (fig.1) is irradiated with light pulses of few femtoseconds duration (one femtosecond corresponds to a millionth of a billionth of a second, fig. 2). If the intensity of the laser pulse is high enough the electrons can absorb the amount of energy that is necessary to be released from the metal tip. Then they can be registered by a detector in front of the tip.
As the tip is extremely sharp, having a curvature radius of about 10 nanometres only, the intensity of the laser light gets greatly amplified. With this, relatively weak laser pulses are sufficient to set free electrons from the metal surface. Because of their short duration the laser pulses contain a few cycles only. Therefore the electric field acting on a particular electron is strongly dependent on the phase shift of the carrier wave relative to the envelope of the pulse (see fig. 2).
In the experiment the number and the kinetic energy of the emitted electrons are measured for different phase shifts. As is demonstrated in fig. 3 the structure of the electron spectrum is strongly influenced by the phase shift. Here two spectra are displayed that have been taken with phase shifts differing by 180 degrees. First of all differences can be noticed concerning the number of electrons at high energies. “The higher the electron energy, the more we approach the situation that we are able to switch the current on or off by simply changing the phase shift by 180 degrees”, Michael Krüger explains, who is, with Markus Schenk, doctoral student at the experiment and one of the two main authors of the publication.
From the slope of the spectrum the scientists conclude that the laser field continues to influence the motion of the electrons even after emission from the metal tip. The almost constant count rate at medium high energies implies that the released electrons are driven back into the tip by the laser field and scatter elastically off the tip before being detected. “As is demonstrated in the experiment this scattering process does not destroy the interference of the electron wave packets, that means, it takes place in a coherent way”, Markus Schenk points out. The resulting spectra are surprisingly well reproduced with numerical calculations based on a simple model that describes the motion of the electrons in the electric field of the laser classically but takes their wavelike nature into account.
For the first time the physicists have succeeded in the steering of electrons emitted from a solid state by the field of a femtosecond laser pulse. Even more, much less intensity was required compared to experiments with electrons in atomic or molecular gases. On the one hand, the new method is an important tool for gaining insight into the dynamics of electrons in solid state surfaces. For example, it is not known whether the scattering process takes place at the entire surface or at a single atom inside or on the surface. On the other hand, because of the low laser intensities required, there is a high potential for practical applications. Combining a metal tip, a retardation grid, and an electron multiplier, compact devices for the measurement and stabilization of phases of laser pulses could be realized. Also the development of optical field effect transistors can be envisaged in which the electric current can be switched on and off by the light field with attosecond precision. Olivia Meyer-StrengOriginal publication:
Dr. Olivia Meyer-Streng | Max-Planck-Institut
NASA detects solar flare pulses at Sun and Earth
17.11.2017 | NASA/Goddard Space Flight Center
Pluto's hydrocarbon haze keeps dwarf planet colder than expected
16.11.2017 | University of California - Santa Cruz
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
17.11.2017 | Physics and Astronomy
17.11.2017 | Health and Medicine
17.11.2017 | Studies and Analyses