New! Sign up for our free email newsletter.
Science News
from research organizations

Ultrafast electron oscillation and dephasing monitored by attosecond light source

Petahertz electron oscillation observed using chromium doped sapphire solid-state material

Date:
April 18, 2018
Source:
Yokohama National University
Summary:
Researchers successfully observed petahertz (PHz: 1015 of a hertz) electron oscillation. The periodic electron oscillations of 667-383 attoseconds (as: 10-18 of a second) is the fastest that has ever been measured in the direct time-dependent spectroscopy in solid-state material.
Share:
FULL STORY

Collaborative research team of Prof. Jun Takeda and Associate Prof. Ikufumi Katayama in the laboratory of Yokohama National University (YNU) and Nippon Telegraph and Telephone (NTT) successfully observed petahertz (PHz: 1015 of a hertz) electron oscillation. The periodic electron oscillations of 667-383 attoseconds (as: 10-18 of a second) is the fastest that has ever been measured in the direct time-dependent spectroscopy in solid-state material.

As high-speed shutter cameras capture motions of fast-moving objects, researchers generally use laser (pulse) like instantaneous strobe light in order to observe the ultrafast motion of an electron underlying a physical phenomenon. The shorter the pulse duration, the faster the electron oscillation can be observed. The frequency of the lightwave-field in the visible and ultraviolet region can reach the petahertz (PHz: 1015 of a hertz), which means that the oscillation periodicity can achieve attosecond (as: 10-18 of a second) duration.

In previous studies, NTT researchers of the team generated an isolated attosecond pulse (IAP) [H. Mashiko et al., Nature commun. 5, 5599 (2014)] and monitored the electron oscillation with 1.2-PHz frequency using gallium-nitride (GaN) semiconductor [H. Mashiko et al., Nature Phys. 5, 741 (2016)]. The next challenges are the observation of faster electron oscillation in the chromium doped sapphire (Cr:Al2O3) insulator and the characterization of the ultrafast electron dephasing.

The paper, published in the journal Nature communications reports a successful observation of the near-infrared (NIR) pulse-induced multiple electronic dipole oscillations (periodicities of 667-383 as) in the Cr:Al2O3 solid-state material. The measurement is realized by the extreme short IAP (192-as duration) and the use of stable pump (NIR pulse) and probe (IAP) system (timing jitter of ~23 as). The characterized electron oscillations are the fastest that has ever been measured in the direct time-dependent spectroscopy. In addition, the individual dephasing times in the Cr donor-like intermediate level and the Al2O3 CB state are revealed.

Dr. Hiroki Mashiko, a NTT scientist of the team, said, "We contrived the robust pump-probe system with an extremely short isolated attosecond pulse, which led to the observation of the fastest electron oscillation in solid-state material in recorded history. The benefits of this study are directly related to the control of various optical phenomena through the dielectric polarization, and the results will help the development of future electronic and photonic devices."


Story Source:

Materials provided by Yokohama National University. Note: Content may be edited for style and length.


Journal Reference:

  1. Hiroki Mashiko, Yuta Chisuga, Ikufumi Katayama, Katsuya Oguri, Hiroyuki Masuda, Jun Takeda, Hideki Gotoh. Multi-petahertz electron interference in Cr:Al2O3 solid-state material. Nature Communications, 2018; 9 (1) DOI: 10.1038/s41467-018-03885-7

Cite This Page:

Yokohama National University. "Ultrafast electron oscillation and dephasing monitored by attosecond light source." ScienceDaily. ScienceDaily, 18 April 2018. <www.sciencedaily.com/releases/2018/04/180418141448.htm>.
Yokohama National University. (2018, April 18). Ultrafast electron oscillation and dephasing monitored by attosecond light source. ScienceDaily. Retrieved April 17, 2024 from www.sciencedaily.com/releases/2018/04/180418141448.htm
Yokohama National University. "Ultrafast electron oscillation and dephasing monitored by attosecond light source." ScienceDaily. www.sciencedaily.com/releases/2018/04/180418141448.htm (accessed April 17, 2024).

Explore More

from ScienceDaily

RELATED STORIES