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Conference on Lasers and Electro-Optics

Photon echo of neutral and charged InP quantum dots

Yasuaki Masumoto, Fumitaka Suto, Michio Ikezawa

Published Jan 1, 2004• 0 citations
Publisher

Abstract

Highly sensitive heterodyne-detected photon echo enabled us to observe the signal from electric-biased one layer of InP quantum dots. It decays at 16 ps in neutral dots, while it is reduced much in charged dots.
DOI
10.1364/iqec.2004.iwc6

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A highly sensitive heterodyne-detected photon echo enabled us to observe the signal from one layer of neutral self-assembled InP quantum dots under an electric field. The photon echo signal dramatically increased when charged InP quantum dots were neutralized with the application of negative electric bias. This fact suggests the hypothesis that charged quantum dots do not produce the photon echo. With the further increase of negative electric bias, photoluminescence was quenched and the photon echo decayed faster. The photon echo showed tunneling-induced dephasing and decayed nonexponentially, reflecting the non-Markovian nature of the tunneling process.
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We demonstrate the hallmark concept of periodic collapse and revival of coherence in a room-temperature ensemble of quantum dots (QDs) in the form of a 1.5-mm-long optical amplifier. Femtosecond excitation pulses induce coherent interactions with a number of discrete homogeneous QD subgroups within an inhomogeneously broadened ensemble, which interfere constructively to induce coherent revival (CR). The amplitude decay of CR is dictated by the QD homogeneous linewidth, thus enabling its extraction in a double-pulse Ramsey-type experiment. The more common photon echo technique is also invoked and yields the same linewidth provided that both experiments use the same bias. A dephasing time T2{T}_{2}T2​ longer than 5 ps is extracted. This is a record long T2{T}_{2}T2​ for a room-temperature QD ensemble and testifies to the high quality of the InAs/InP QDs used in the experiments. Measured electrical bias and temperature dependencies of the transverse relaxation times (T2{T}_{2}T2​ and T2∗{T}_{2}^{*}T2∗​) enable the determination of the two main decoherence mechanisms: carrier-carrier and carrier-phonon scatterings.