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

Electromagnetically induced transparency in asymmetric double quantum wells in the transient regime

Leonardo Silvestri, G. Czajkowski

Published Feb 20, 2008• 3 citations
Publisher

Abstract

Abstract We report computation of the nonlinear response of a probe light in the presence of a driving field satisfying the Electromagnetically Induced Transparency (EIT) condition in the Λ configuration appropriate to an Asymmetric Double Quantum Well (ADQW). The novelty of the present results with respect to those of previous calculations is to consider the transient regime in which both the pump and the probe radiation are pulses of picosecond duration.We investigate the dependence of the transparency on pump and probe duration and also on the delay of the latter with respect to the former. We show the advantages of properly choosing the duration of the pump and the probe light and the asymmetry in the delay time of the probe. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

DOI
10.1002/pssc.200777649

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CRC Press eBooks•Oct 3, 2018•0 citations
Abstract We report computation of the nonlinear response of a probe light in the presence of a driving field satisfying the Electromagnetically Induced Transparency (EIT) condition in the Λ configuration appropriate to an Asymmetric Double Quantum Well (ADQW). The novelty of the present results with respect to those of previous calculations is to consider the transient regime in which both the pump and the probe radiation are pulses of picosecond duration.We investigate the dependence of the transparency on pump and probe duration and also on the delay of the latter with respect to the former. We show the advantages of properly choosing the duration of the pump and the probe light and the asymmetry in the delay time of the probe. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Results of numerical analysis of the influence of probe pulse duration on the character of its evolution under the conditions of electromagnetically induced transparency in a Λ-scheme involving degenerate quantum transitions are presented. The cases of weak and strong input probe pulses linearly polarized in the same direction as the polarized coupling radiation, along with the case of linearly polarized probe radiation and circularly polarized coupling radiation, are considered. Calculations showed that the regime of weak probe radiation is most favorable for formation of a short probe pulse with a duration of about 1 ns and pulse shape that does not change substantially upon pulse propagation. However, even in this case, picosecond probe pulses experience considerable deformation of their shape and loss of power. Considerable changes of the pulse shape in the case of a strong probe pulse occur already when the pulse duration approaches 1 ns. This circumstance can limit the response time of prospective devices based on the effect of electromagnetically induced transparency.
Abstract In this communication, we investigate linear and nonlinear (Kerr) responses in an asymmetric double quantum wells induced by a weak probe and controlled by a signal field under double Λ excitation via the Fano interference. By carefully tuning the control field intensities, probe detuning and relative phase of the interacting electromagnetic fields, the amplification as well as the electromagnetically induced transparency (EIT) can be achieved to an efficient level in the proposed scheme. We observe that the absorption of the probe and signal fields decrease with the decrease in the strength of the Fano interference (ξ), while the Kerr nonlinearity enhances by almost ten times, reaching a value of the order ~ 10 − 10 m 2 / V 2 under the regime of EIT. The results presented may serve as a valuable reference for designing optimized slow and fast-light, solid-based optical switching devices, offering significant advantages over those based on atomic media.
Abstract In this article, we present an alternative excitation scheme for the study of optical responses of the probe field in a five-level semiconductor coupled quantum wells (CQWs). It is shown that in the linear case, our study reveals the formation of double and triple electromagnetically induced transparency (EIT) windows for the suitable values of Rabi-frequency of the control fields, while the linear dispersion is also tuned from anomalous to normal and vice versa within small range of detuning. Interestingly, we find that by properly adjusting the appropriate values of control field detunings, the behaviour of optical absorption and transparency is found to be asymmetric in nature. In addition, we also found that due to quantum coherence, nonlinear dispersion, specifically Kerr nonlinearity is dramatically enhanced with nearly vanishing linear absorption under EIT. The Kerr nonlinearity in the present scheme is identified to be very large ( ∼10−13 m2 V−2\:\sim{10}^{-13}\:{m}^{2}\:{V}^{-2}∼10−13m2V−2) in the mid IR range ( λ p=4.74  μ m\:{\lambda\:}_{p}=4.74\:\:\mu\:mλp​=4.74μm), which can be very useful for the investigation of several nonlinear phenomena at low light intensity in CQWs. The results of the investigations may have potential applications in optical switching devices at low powers, quantum information processing and many more in solid-state laser based system.
We show how to compute nonlinear optical absorption spectra of an asymmetric double quantum well in the region of intersubband electronic transitions. The method uses the microscopic calculation of the dephasing due to electron–electron and electron–phonon scattering rates and the macroscopic real density matrix approach to compute the electromagnetic fields and susceptibilities. For a proper choice of the QW widths and of the driving fields we obtain electromagnetically induced transparency. Results are given for GaAs/GaAlAs QWs and experiments are proposed.
The numerical simulation results of the probe pulse duration influence on this pulse evolution in presence of electromagnetically induced transparency are presented. We investigate the cases of weak and strong input pulses in degenerated quantum transition Λ -scheme with inhomogeneous line broadening. The linear polarizations of probe and control radiation are supposed. According to our calculations, the weak input probe pulse regime is the most favorable for formation of more than one nanosecond duration probe pulse with small varying of envelop form by its transition. The strong input probe pulse condition is disadvantageous for preservation of pulse shape when the probe pulse travels across the medium, for duration less than several nanoseconds. This circumstance imposes restriction on operating speed of the perspective equipments, principle operation of which bases on the electromagnetically induce transparency effect.
This chapter discusses advantage of the many-body Coulomb interactions to generate and manipulate nonradiative quantum coherences. It describes theoretically, the manifestation and behavior of electromagnetically induced transparency (EIT) processes in transient regimes. The chapter also discusses experimental demonstrations of EIT using excitons in gallium arsenide quantum-well structures. It shows that many-body Coulomb interactions between excitons can be exploited for the generation and manipulation of exciton spin coherence and biexciton coherence. The chapter provides the similarities and especially the essential differences in EIT processes between atomic and excitonic systems. It focuses on the changes in the absorption spectrum induced by EIT; these changes are also accompanied by corresponding changes in the refractive index. The absorption spectrum features a distinct EIT dip similar to that observed for cw excitations. The experimental setup for transient EIT studies was based on a standard transient pump-probe configuration, but with different pump and probe pulse durations.