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H28年度 第6回 固体物理セミナーを開催します

H28年度 第6回 固体物理セミナーを開催します

2016年8月2日

固体物理セミナー
(平成28年度 第6回)
(インタラクティブ物質科学カデットプログラム講演会)
INSD NanoScience Seminar (No.17)

Date and Time: Tuesday, August 2nd, 2016, 16:20-17:50
Place: Room A403, Graduate School of Engineering Science, Toyonaka Campus
Title: COHERENT PHOTONICS
WITH QUANTUM DOTS
Lecturer: Prof. Ulrike Woggon (Technical University of Berlin, Germany)

We give an overview about present concepts to exploit principles of nonlinear optics in ultrafast devices for telecommunication. Room temperature quantum-coherent effects such as Rabi-oscillations, pulse shaping and break-up are demonstrated with attosecond time-resolution. Femtosecond heterodyne pump-probe techniques are combined with cross-correlation pulse analysis [1] and quantum state tomography [2]. Applied to the transmission of a coherent state through an In(Ga)As based quantum dot optical amplifier, the Wigner function and the statistical moments of the field were extracted and used to determine the degree of population inversion and the signal-to-noise ratio in a sub-picosecond time window at room temperature operation. We can show that for suitably designed condensed matter systems, quantum-coherent effects are thus robust to be observable at room temperature, even in the presence of ultrafast dephasing, e.g. via electrically injected charged carriers.

[1] M. Kolarczik, N. Owschimikow, J. Korn, B. Lingnau, Y. Kaptan, D. Bimberg, E. Schöll, K. Lüdge and U. Woggon. Quantum coherence induces pulse shape modification in a semiconductor optical amplifier at room temperature. Nature Commun. DOI: 10.1038/ncomms3953 (2013).
[2] N. B. Grosse, N. Owschimikow, R. Aust, B. Lingnau, A. Koltchanov, M. Kolarczik, K. Lüdge, and U. Woggon. Pump-probe quantum state tomography in a semiconductor optical amplifier. Optics Express 22, 32520 (2014).

Contact Person: Prof. M. Ashida,
Division of Frontier Materials Science, Graduate School of Engineering Science
E-mail: ashida@mp.es.osaka-u.ac.jp

*固体物理セミナーは、物性・未来(物性系)M2必修科目「ゼミナールⅢ」に該当します

 

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