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Scientific Reports

Tunneling induced absorption with competing Nonlinearities

Yandong Peng, Aihong Yang, Yan Xu, Peng Wang, Yang Yu, Hongju Guo, Tingqi Ren

Published Dec 13, 2016• 17 citations
Publisher

Abstract

We investigate tunneling induced nonlinear absorption phenomena in a coupled quantum-dot system. Resonant tunneling causes constructive interference in the nonlinear absorption that leads to an increase of more than an order of magnitude over the maximum absorption in a coupled quantum dot system without tunneling. Resonant tunneling also leads to a narrowing of the linewidth of the absorption peak to a sublinewidth level. Analytical expressions show that the enhanced nonlinear absorption is largely due to the fifth-order nonlinear term. Competition between third- and fifth-order nonlinearities leads to an anomalous dispersion of the total susceptibility.

DOI
10.1038/srep38251

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We investigate tunneling induced nonlinear absorption phenomena in a coupled quantum-dot system. Resonant tunneling causes constructive interference in the nonlinear absorption that leads to an increase of more than an order of magnitude over the maximum absorption in a coupled quantum dot system without tunneling. Resonant tunneling also leads to a narrowing of the linewidth of the absorption peak to a sublinewidth level. Analytical expressions show that the enhanced nonlinear absorption is largely due to the fifth-order nonlinear term. Competition between third- and fifth-order nonlinearities leads to an anomalous dispersion of the total susceptibility.
Tunneling-induced large fifth-order nonlinearity is theoretically demonstrated in a double-quantum-dot system. The resonant tunneling induces constructive interference for the third- and fifth-order nonlinear effects. The competition between the linearity and nonlinearity leads to a transparency window at some frequency detunings, where the fifth-order nonlinear refractive index could be increased to be more than one order of magnitude larger than that on resonance. An analytical expression shows that the resonant tunneling mainly contributes to the dramatic enhancement of the fifth-order nonlinear response.
Abstract A tunable broadband absorber induced by resonant tunneling is investigated in a coupled quantum-dot (CQD) system. The CQDs show a narrow absorption in a linear case. When the inter-dot tunneling arises, constructive interference occurs in a nonlinear absorption, which exhibits a large absorption in a wide frequency range. Therefore, the total absorption spectrum is much more broadened, and its bandwidth under given conditions can be one order of magnitude larger than that of the liner absorption. Bright-state coherence is employed to qualitatively explain the numerical results. Furthermore, the dependence of the broad absorption on the tunneling strength and analytical expression of the nonlinear absorption spectrum are also provided.
Enhanced fifth-order nonlinearity with Fano interference is theoretically studied in asymmetric double quantum wells. The resonant tunneling induces constructive interference for third- and fifth-order nonlinearities. Their competition causes a transparency window at some frequency detuning, where the fifth-order refractive index can be simultaneously enhanced by Fano interference. Simulation results show that fifth-order nonlinearity can be enhanced by about 10 times compared to that without the Fano effect. Also, the influence of different strengths of resonant tunneling coupling and Fano interference on enhanced high-order nonlinearity is discussed.
Schemes for giant fifth-order nonlinearity via tunneling in both linear and triangular triple quantum dots are proposed. In both configurations, the real part of the fifth-order nonlinearity can be greatly enhanced, and simultaneously the absorption is suppressed. The analytical expression and the dressed states of the system show that the two tunnelings between the neighboring quantum dots can induce quantum interference, resulting in the giant higher-order nonlinearity. The scheme proposed here may have important applications in quantum information processing at low light level.
A scheme of tunneling-induced perfect absorption is proposed in an intracavity quantum-well (QW) system. In the linear case, the cavity transmission is found to be narrowed and weakened with respect to an empty cavity. In the nonlinear case, the resonant tunneling induces constructive interference for the nonlinear absorption, with the total absorption dramatically enhanced. For the cavity modes close to the QW resonant frequency, the cavity field can be completely absorbed, and the tunneling-induced perfect absorption (TPA) effect appears in the cavity transmission. The intensities of the control field and inter-well coupling broaden the TPA bandwidth, and the frequency detuning of the control field shifts the TPA window.
Abstract An efficient scheme for probing electron tunnelling is proposed based on the enhanced cross-Kerr nonlinearity in a double–dot system. Due to resonant tunnelling, the cross-Kerr nonlinearity arises in a transparency window. Its intensity is nearly two orders of magnitude greater than that of the self-Kerr effect under any given conditions, where residual absorption is suppressed due to the competition of nonlinear gain and absorption. The enhanced cross-Kerr effect is sensitive to the tunnelling, so the probe spectrum can detect subtle tunnelling changes. The simulation results show that the probe sensitivity of the nonlinear phase shift is about 0.28 rad/ μ eV.