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AIP conference proceedings

Giant fifth order nonlinearity in N-type four level triple quantum wells

Rohit Mukherjee, Swapan Konar

Published Jan 1, 2019• 0 citations
Publisher

Abstract

In this communication we have predicted the existence of large fifth order nonlinearity in triple quantum well structures, that arises due to the interaction of a weak optical probe pulse and two strong continuous laser beams. A fifth order nonlinear susceptibility of the order ∼10−25 m4 /V4 has been estimated within the electromagnetically induced transparency window. The fifth order nonlinearity could be controlled by controlling the values of detuning and Rabi-frequencies of the control field.

DOI
10.1063/1.5120938

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In this communication we have predicted the existence of large fifth order nonlinearity in triple quantum well structures, that arises due to the interaction of a weak optical probe pulse and two strong continuous laser beams. A fifth order nonlinear susceptibility of the order ∼10−25 m4 /V4 has been estimated within the electromagnetically induced transparency window. The fifth order nonlinearity could be controlled by controlling the values of detuning and Rabi-frequencies of the control field.
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.
The self-phase modulation and modulation instability of an optical probe electromagnetic field in multiple quantum well systems under electromagnetically induced transparency has been investigated. The probe field experiences large Kerr and quintic nonlinearities that can be controlled by two controlling laser beams. The probe beam experiences self-phase modulation which is suppressed by the quintic nonlinearity. The probe field is modulationally unstable due to the existence of large nonlinearities. The bandwidth of unstable frequencies and growth of the instability could be controlled by the probe beam power, the Rabi frequency and detunings of two control fields. The presence of the higher order nonlinearity and dispersion significantly reduce the instability growth and bandwidth of unstable frequency.
Abstract This paper deals with the higher-order nonlinearities in graphene quantum dots as defect layer in one dimensional photonic crystal. A weak probe pulse and two strong control laser beams are employed in a close loop ladder type configuration under an electromagnetically induced transparency regime. In the system, the existence of third- and fifth-order susceptibilities are found to be as large as ~10−15 m 2/V 2, and ~10−27 m 4/V 4, respectively, at the probe wavelength 1.55 μm. The systems possessing such large nonlinearities can be employed to fabricate nonlinear optical devices, operable at much low power level.
This article explores the modulation instability of a continuous or quasi-continuous weak probe pulse in a three-level asymmetric double quantum wells under an electromagnetically induced transparency regime, controlled by a strong laser beam. The dynamics of modulation instability reveals that the instability gain as well as its bandwidth is greatly influenced by control field Rabi frequency. The probe pulse is found to be almost stable against modulation instability for higher values of control field Rabi frequency. The results of this investigation may potentially apply for oscillation free generation of supercontinuum in quantum well nanostructures.
We investigate the optical Kerr nonlinearities of an ensemble of cold Rydberg atoms under the condition of electromagnetically induced transparency (EIT). By using an approach beyond mean-field theory, we show that the system possesses not only enhanced third-order nonlinear optical susceptibility, but also giant fifth-order nonlinear optical susceptibility, which has a cubic dependence on atomic density. Our results demonstrate that both the third-order and the fifth-order nonlinear optical susceptibilities consist of two parts, contributed respectively by photon-atom interaction and Rydberg-Rydberg interaction. The Kerr nonlinearity induced by the Rydberg-Rydberg interaction plays a leading role at high atomic density. We find that the fifth-order nonlinear optical susceptibility in the Rydberg-EIT system may be five orders of magnitude larger than that obtained in traditional EIT systems. The results obtained may have promising applications in light and quantum information processing and transmission at weak-light level.