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Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics

Polarization dependence of four‐wave mixing via biexcitons in CuCl microcavities

Shimpei Matsuura, Yasuyoshi Mitsumori, Hideo Kosaka, Keiichi Edamatsu, Kenichi Miyazaki, Y. Kanatani, D. Kim, Masaaki Nakayama, Goro Oohata, Hisaki Oka, Hiroshi Ajiki, Hajime Ishihara

Published Nov 6, 2012• 2 citations
Publisher

Abstract

Abstract We studied the CuCl microcavity designed for the enhancement of the biexciton‐photon coupling, in terms of spectrally resolved four‐wave mixing. We observed the strong dependence of the spectrum on the polarization of the pump pulses and the polarization correlation between the pump pulses and the four‐wave mixing signal, suggesting that the biexciton state is successfully formed in the CuCl microcavity. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

DOI
10.1002/pssc.201200326

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physica status solidi (b)•Nov 1, 1986•7 citations
Abstract We studied the CuCl microcavity designed for the enhancement of the biexciton‐photon coupling, in terms of spectrally resolved four‐wave mixing. We observed the strong dependence of the spectrum on the polarization of the pump pulses and the polarization correlation between the pump pulses and the four‐wave mixing signal, suggesting that the biexciton state is successfully formed in the CuCl microcavity. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A coherently driven exciton–biexciton transition in CuCl enables one to propagate a probe light beam within the exciton-polariton stop-band where radiation is otherwise completely reflected. The stop-band transparency window can be controlled via the pump beam frequency and intensity. The phenomenon is reminiscent of quantum coherence effects occurring in three-level atomic systems, except that it here involves delocalized electronic excitations in a crystal via a frequency and wave-vector selective polaritonic mechanism. Both a free standing slab and a microcavity configuration are theoretically studied. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Abstract We theoretically investigate entangled‐photon generation via biexciton in a planar microcavity. When the exciton‐photon coupling is comparable to the biexciton binding energy, the biexciton can be stably coupled with the cavity photons (referred to as a cavity biexciton). Entangled photons are generated by the cascade decay of the cavity biexciton. We show that high‐efficient generation of entangled photons can be achieved when the superposition state of a cavity biexciton and two cavity polaritons formed by unbound two‐exciton states is realized. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
We observed the antibound state, as well as the bound state, for cavity polariton pairs in a planar CuCl microcavity by spectrally resolved four-wave mixing. We obtained dispersion curves of the bound and antibound states by changing the incident angle of the pump pulses corresponding to the cavity detuning. The dispersion curve for the bound state suggests that the bound state is mainly composed of a bare biexciton and is weakly coupled to the cavity photons. The dephasing time of the bound state was faster than that of a bare biexciton in a thin sample, supporting the hypothesis that the bound state is coupled to the cavity photons. On the other hand, the antibound state consists of two lower polaritons having the same spin. The clear observation of the antibound state can be qualitatively explained by the phase-space filling, which reduces the Rabi splitting.
Abstract In experiments and simulations based on a microscopic theory the optical coherent control of exciton–biexciton beats in coherent four‐wave‐mixing signals from a semiconductor quantum well is demonstrated. It is found that a reduction of the beat amplitude for one four‐wave‐mixing direction may at the same time coincide with a large beat amplitude for the other direction. The results can be understood by considering that at least two‐photon processes are required to coherently excite biexcitonic transitions which are responsible for the occurrence of the beat structure in the four‐wave‐mixing signals. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
We studied the population and coherence dynamics of a biexciton in a planar CuCl microcavity. We developed a time-resolved two-photon polarization spectroscopy technique, by which we extracted the population dynamics of the biexciton even when the biexciton was spectrally overlapped with the lower cavity polariton. The observed lifetime of the cavity biexciton in the weak-coupling regime was much shorter than that of a bare CuCl thin film without a cavity, which directly demonstrates cavity enhancement of the radiative decay rate of the biexciton. The cavity enhancement originates from the hybridization of the unbound two-cavity-polariton state to the biexciton wave function by the biexciton-cavity coupling. By comparing the population and coherence decay curves of the biexciton, we found that the coherence of the cavity biexciton was limited by the radiative population decay.
Abstract Using nanosecond laser pulses the time behaviour is investigated of degenerate four‐wave mixing close to the biexcitonic resonance in CuCl. The signal emission presents different time evolutions depending on excitation conditions. Its generation rate shows intensity changes and retardation effects. These effects are explained by an attenuation of the pump pulse through a time‐dependent nonlinear absorption and, at the resonance, by a loss of coherence related to collisions with bi‐excitons.