Kerr effect in Y-configuration double-quantum-dot system

Al-Nashy, B.; Amin, S.M.M.; Al-Khursan, Amin H.

doi:10.1364/josab.31.001991

Cited by 33 publications

(13 citation statements)

References 21 publications

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“…The nonlinear term makes a considerable contribution to the magnitude of the total OAC, so the larger the QD radius, the more the total OAC is reduced. It can be easily determined that the OACs as a function of QD radius R have a feature similar to those reported by a number of authors [23,24]. (2) the linear, the third-order nonlinear and the total OACs have a resonance peak where photon energy equal to the energy difference E 01 between ground states E 00 and first excited states E 01 , which is the resonance photon energy.…”

Section: Resultssupporting

confidence: 75%

Donor-impurity-related optical absorption and refractive index changes in GaAs/AlGaAs core/shell spherical quantum dots

Zhang

Zhuang

Guo

et al. 2016

Superlattices and Microstructures

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In this study, the linear and nonlinear intersubband optical absorption coefficients (OACs) and refractive index changes (RICs) in GaAs/AlGaAs core/shell spherical quantum dots (QDs) are theoretically investigated within the framework of the compact-density-matrix approach and iterative method for both cases with and without on-center impurity. The energy eigenvalues and their corresponding eigenfunctions of the system are calculated by using the differential method. Our results show that the position and the magnitude of the resonant peaks of the nonlinear OACs and RICs depend strongly on the hydrogenic impurity and QDs radius. It was found that the total OACs indicates saturation at sufficiently high incident intensities. Also we found that the binding energy of the ground and excited states of the impurity depend on the QDs radius.

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Section: Resultssupporting

confidence: 75%

Donor-impurity-related optical absorption and refractive index changes in GaAs/AlGaAs core/shell spherical quantum dots

Zhang

Zhuang

Guo

et al. 2016

Superlattices and Microstructures

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“…This makes the inhomogeneity in the calculation of SONS, which reduced the imaginary part to 1.87 m∕V, i.e., approximately half. Inhomogeneity was also shown to reduce Kerr (third-order) susceptibility to its halfvalue [10,11]. Figure 3(b) shows that SONS reduced by three orders and the wavelength was red shifted to 80 μm when the field strength increased to 100 kV∕cm, providing evidence of the difference between conduction subband energies (see Fig.…”

Section: Wl-qd Transitionmentioning

confidence: 88%

“…The Y-configuration in a four-level double QD system and the possibility of manipulation of QD subbands to control its linear and nonlinear Kerr have been introduced and predicted [10,11]. Rong et al studied THz generation in the double QD system considering ground conduction and valence QD subbands.…”

Section: Introductionmentioning

confidence: 99%

Terahertz emission in ladder plus Y-configurations in double quantum dot structure

2015

Self Cite

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The ladder plus Y-double quantum dot (QD) structure has been proposed to improve the second-order nonlinear susceptibility (SONS) under applied electric field. For this purpose, the wetting layer (WL) and QD inhomogeneity contribution in SONS has been considered. In addition, the structure size effect, energy level separation, momentum matrix elements, and pump detuning have been examined, and show that the SONS is increased by using the WL, a low momentum matrix element of WL-QD transition in comparison with interdot transition while QD inhomogeneity reduces SONS to half. This work is predicted to play a key role in terahertz applications, since the frequency emissions obtained are in the range of 75.5-600 μm.

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“…Such molecules are applicable volunteers for quantum coherence-based studies, because of ease of integration, controlling size and energy level spacing as well as their large bandwidth 34 . In this regard, it has been shown that the optical properties of such systems can depend on the interdot tunneling effect, which has been used for controlling optical bistability 35 , entanglement 36 , 37 , light propagation 38 , 39 and orbital angular momentum transfer 40 . Notice that the QDMs cannot exhibit vibrational or rotational features and they indeed display somewhat different properties with respect to usual molecules.…”

Section: Introductionmentioning

confidence: 99%

Tunneling-induced optical limiting in quantum dot molecules

Veisi

Kazemi

Mahmoudi

2020

Sci Rep

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We present a convenient way to obtain an optical power limiting behavior in a quantum dot molecule system, induced by an interdot tunneling. Also, the effect of system parameters on the limiting performance is investigated; interestingly, the tunneling rate can affect the limiting performance of the system so that the threshold of the limiting behavior can be a function of the input voltage, allowing the optimization of the limiting action. Furthermore, by investigating the absorption of the probe field, it is demonstrated that the optical limiting is due to a reverse saturable absorption mechanism; indeed, analytical results show that this mechanism is based on a cross-Kerr optical nonlinearity induced by the tunneling. Additionally, the limiting properties of the system are studied by using a Z-scan technique.

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Kerr effect in Y-configuration double-quantum-dot system

Cited by 33 publications

References 21 publications

Donor-impurity-related optical absorption and refractive index changes in GaAs/AlGaAs core/shell spherical quantum dots

Donor-impurity-related optical absorption and refractive index changes in GaAs/AlGaAs core/shell spherical quantum dots

Terahertz emission in ladder plus Y-configurations in double quantum dot structure

Tunneling-induced optical limiting in quantum dot molecules

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