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Journal of Optics

Switching of amplification to absorption with enhanced Kerr nonlinearity in double quantum wells via Fano interference

Rohit Mukherjee, Nitu Borgohain, Rohit Hazra

Published Jun 11, 2026• 0 citations
Publisher

Abstract

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.

DOI
10.1088/2040-8986/ae7c11

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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.
Abstract We theoretically investigate the hybrid absorptive-dispersive optical bistability (OB) and optical multistability (OM) behaviors induced by Fano-type interference in a four-subband asymmetric semiconductor double quantum wells scheme driven by a degenerate probe field and a coherent coupling field. We show that the appearance or disappearance of OB can be controlled by modulating the strength of the Fano-type interference. We also present the threshold and hysteresis cycle of the OB can be controlled by adjusting the intensity of the coherent coupling field. Moreover, OB can be switched to OM by tuning the frequency detuning of the coherent coupling field or vice versa. This interesting scheme may provide guidance for technological applications in optoelectronics and solid-state quantum information science.
We investigate the light propagation and dynamical control of a weak pulsed probe field in asymmetric double quantum wells via Fano interference, which is caused by tunneling from the excited subbands to the same continuum. Our results show that the system can produce anomalous and normal dispersion regions with negligible absorption by choosing appropriate coupling strength of the tunneling and the Fano interference. Interesting enough, the dispersion can be switched between normal and anomalous by adjusting the relative phase between the pulsed probe and coherent control fields owing to the existence of the perfectly Fano interference. Thus, the relative phase can be regarded as a switch to manipulate light propagation with subluminal or superluminal. The temporal and spatial dynamics of the pulsed probe field with hyperbolic secant envelope are analyzed.
Abstract: A theoretical investigation is carried out into the impact of incoherent pumping fields and quantum interference induced by incoherent pumping fields on the Kerr nonlinearity in a three-level asymmetric semiconductor quantum well system. It is found that Kerr nonlinearity is so sensitive to the rate of incoherent pumping fields, but insensitive to the quantum interference induced by incoherent pumping fields. In addition, it is demonstrated that an enhanced Kerr nonlinearity with reduced absorption can be achieved just via the strength of Fano- type interference and without applying any coherent laser field. The obtained results are very different from the conventional schemes which coherent coupling fields are used to control the Kerr nonlinearity. This advantages make our electronic medium much more practical than its atomic counterpart due to its flexible design and the controllable interference strength.