Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

THz quantum-confined Stark effect in semiconductor quantum dots

[+] Author Affiliations
Dmitry Turchinovich

Technical Univ. of Denmark (Denmark)

Boris S. Monozon

State Marine Technical Univ. of St. Petersburg (Russian Federation)

Daniil A. Livshits

Innolume GmbH (Germany)

Edik U. Rafailov

Univ. of Dundee (United Kingdom)

Matthias C. Hoffmann

Univ. Hamburg (Germany) and Linac Coherent Light Source, Stanford Univ. (USA)

Proc. SPIE 8260, Ultrafast Phenomena and Nanophotonics XVI, 826003 (February 9, 2012); doi:10.1117/12.906448
Text Size: A A A
From Conference Volume 8260

  • Ultrafast Phenomena and Nanophotonics XVI
  • San Francisco, California, USA | January 21, 2012

abstract

We demonstrate an instantaneous all-optical manipulation of optical absorption at the ground state of InGaAs/GaAs quantum dots (QDs) via a quantum-confined Stark effect (QCSE) induced by the electric field of incident THz pulses with peak electric fields reaching 200 kV/cm in the free space. As a result, a THz signal with the full bandwidth of 3 THz can be directly encoded onto an optical signal probing the ground state absorption in QDs, resulting in the encoded temporal features as fast as 460 fs. The optical absorption modulation at highest THz fields reaches about 30% of the total optical absorption in QDs at the ground state. The dependency of electro-absorption modulation depth on the peak THz field is found to be strongly nonlinear, as expected from the QCSE. From this dependency we conclude that the dominant contribution to the observed electro-absorption modulation in our sample is made by the overall optical absorption quenching via a reduction of the overlap integral and hence the probability of inter-band transition, rather than by the Stark shift of the QD absorption peak away from the spectrum of the optical probe. As expected from the three-dimensional geometry of a QD, the THz QCSE was found to be independent of the polarization of the THz field. The instantaneous nature of THz QCSE in QDs enables femtosecond all-optical switching at very high repetition rates. This allowed us to demonstrate the potential for applications in THz-range wireless communication systems with the data rate of at least 0.5 Tbit/s.

© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Dmitry Turchinovich ; Boris S. Monozon ; Daniil A. Livshits ; Edik U. Rafailov and Matthias C. Hoffmann
"THz quantum-confined Stark effect in semiconductor quantum dots", Proc. SPIE 8260, Ultrafast Phenomena and Nanophotonics XVI, 826003 (February 9, 2012); doi:10.1117/12.906448; http://dx.doi.org/10.1117/12.906448


Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.