Abstract
In a THz pump - optical probe experiment we demonstrate an instantaneous electro-absorption
effect in InGaAs/GaAs quantum dots, induced by the electric field of a single-cycle THz pulse
with 3 THz bandwidth and with free-space peak electric field reaching 220 kV/cm. The transient
modulation of QD ground state optical absorption at 1040 nm coherently follows the evolution of the
absolute value of THz electric field. The optical modulation signal was found to be as short as 460
fs at FWHM, and retained the 3 THz bandwidth of the THz pulse. Optical absorption modulation
in QDs by the THz field is dominated by absorption quenching effect due to the electron- and hole
wavefunction separation in THz field, rather than by the Stark shift away from the optical probe.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of EDISON 17 |
| Publication date | 2011 |
| Publication status | Published - 2011 |
| Event | 17th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures - Santa Barbara, CA, United States Duration: 8 Aug 2011 → 12 Aug 2011 Conference number: 17 http://www.asu.edu/aine/EDISON17/ |
Conference
| Conference | 17th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures |
|---|---|
| Number | 17 |
| Country/Territory | United States |
| City | Santa Barbara, CA |
| Period | 08/08/2011 → 12/08/2011 |
| Internet address |