Kerr nonlinearity due to intersubband transitions in a three-level InAs/GaAs quantum dot: the impact of a wetting layer on dispersion curves

Khaledi-Nasab, Ali; Sabaeian, Mohammad; Sahrai, Mostafa; Fallahi, Vahid

doi:10.1088/2040-8978/16/5/055004

Cited by 17 publications

(4 citation statements)

References 41 publications

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“…This lifetime spectrum was recorded using a diode laser of wavelength of 330 nm and pulse duration of 1.5 ns. The average lifetime (t avg ) of the synthesised MoS 2 QDs is calculated using Equation (1).…”

Section: Optical Propertiesmentioning

confidence: 99%

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Synthesis and characterisation of MoS₂ quantum dots by liquid nitrogen quenching

Baby

Kumar

2019

Materials Science and Technology

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Among transition metal dichalcogenides family, molybdenum disulphide (MoS2) nanomaterial has a vital role in two-dimensional field due to its intrinsic optical and electronic properties. In this study, we report a new top-down approach for synthesising MoS2 quantum dots (QDs). This strategy consists of liquid nitrogen (LN2) quenching of bulk MoS2 material followed by two processes, probe sonication and ultra-centrifugation. This approach is simple, cost effective and eco-friendly. The structural, optical and morphological properties of obtained MoS2 quantum dots were characterised. Photoluminescence spectra (PL) of the synthesised MoS2 QDs show blue light emission when excited with ultraviolet radiation (365 nm). A significant observation in this study is that, the peak position of photoluminescence (PL) emission spectra is independent of excitation wavelength. In addition, a higher fluorescence quantum yield was obtained for the present MoS2 QDs compared to MoS2 QDs prepared by other methods.

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Section: Optical Propertiesmentioning

confidence: 99%

“…Nowadays, Quantum dot (QD) materials have attracted great attention in both scholastic and industrial research fields due to their exceptional optical and electronic properties [1]. In 1983, Quantum dots in colloidal solution were discovered by Brus [2].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of MoS₂ quantum dots by liquid nitrogen quenching

Baby

Kumar

2019

Materials Science and Technology

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“…For this purpose, we are going to solve the single-band Schrödinger equation in effective mass approximation for conduction-band electronic structure [39][40][41][42][43]:…”

Section: Model and Calculation Of Electronic Structure Parametersmentioning

confidence: 99%

Phase-dependent intersubband optical properties of asymmetric AlGaAs/GaAs coupled quantum wells

Golestani

Khaledi-Nasab

Asgari³

2015

Journal of Modern Optics

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In this article, we have investigated the optical properties of intersubband transitions in an asymmetric AlGaAs/GaAs coupled quantum wells system. We solved the Schrödinger equation numerically using homemade finite difference codes to determine the electronic structure. The susceptibilities were calculated in frame of density matrix equations. The effect of relative phase variation between applied fields, on the linear absorption coefficients, relative refractive index changes, and group velocity has been investigated. The results show that the linear optical properties are extremely phase-dependent. By adjusting the phase, it is possible to obtain absorption curves with dispersion-like profile and vice versa.Keywords: coupled quantum well; relative phase effect; dispersion-like and absorption-like profiles; interssubband optical properties IntroductionSemiconductor nanostructures, such as quantum dots (QDs) and quantum wells (QWs), approach the quantum information to leverage industry's vast technological infrastructure and integrate with existing information and communication technologies [1]. Those structures have received considerable attention for their applications in high-tech electronics and optoelectronics devices such as optical modulators, switches, detectors, and sensing [2][3][4]. The GaAs-based devices potentially have great advantages such as high electron mobility, high thermal stability, low noise, and wide temperature operating range [5,6]. The GaAs QW is tunable of the range of optical wavelengths that can be emitted and absorbed. Therefore, the growth of GaAs-based materials on various substrates is extensively studied and a wide range of optical wavelength engineering is being achieved.In the past two decades, coherent quantum processes have taken into consideration. Quantum interference and coherence can generate some interesting phenomena such as electromagnetically induced transparency (EIT) [7], enhancement of refractive index [8][9][10], optical bistability [11], Kerr nonlinearity [12,13], four-wavemixing [14][15][16][17], optical switching [18,19], and generation of optical solitons [20]. One area of current interest in optical physics of asymmetric coupled quantum wells (CQWs) is measuring coherent quantum processes [21]. A particular example of this is work on terahertz oscillations excited by short optical pulses [22], in which one

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“…The size-dependent absorption and highly efficient light emission in QDs are particularly suitable for optical communication technologies and manufacturing highperformance photovoltaic devices, as well as light absorbers in photocatalysis. [14][15][16][17][18][19] Owing to their high extinction coefficients and tunable absorption spectrum, QDs are proper candidates for reducing the cost and increasing the efficiency of photocells we are using today. Perovskite QDs inherit all the above-mentioned advantages of both perovskite structures and QDs' structures, which makes them promising materials.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent first-principles study of optical response of BaTiO₃ quantum dots coupled with silver nanowires*

Han¹,

Zhang²

2019

Chinese Phys. B

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All-inorganic perovskite quantum dots (QDs) have drawn much attention due to their prominent quantum-size effects and highly tunable optical properties. Tuning the size of perovskite QDs is attractive for many potential applications. For instance, smaller QDs exhibit more evident quantum properties than larger QDs, but present a blue-shifted spectrum, which limits their applications. Here, we conduct a systematically theoretical analysis about the optical response and plasmon resonance of comparatively small barium titanate quantum dots (BTO–QDs) coupled with silver (Ag) nanowires based on time-dependent density functional theory (TDDFT). Our results show that the silver nanowires can induce an intense optical response respectively in the infrared and visible region to eliminate the spectrum-shift. Furthermore, the absorption spectrum and plasmon resonance can be effectively modified by either altering the position of the silver nanowires or changing the thickness of the BTO–QDs. More importantly, these two methods can act simultaneously, this maybe provide a new approach to implementing the quantum control.

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Kerr nonlinearity due to intersubband transitions in a three-level InAs/GaAs quantum dot: the impact of a wetting layer on dispersion curves

Cited by 17 publications

References 41 publications

Synthesis and characterisation of MoS₂ quantum dots by liquid nitrogen quenching

Synthesis and characterisation of MoS₂ quantum dots by liquid nitrogen quenching

Phase-dependent intersubband optical properties of asymmetric AlGaAs/GaAs coupled quantum wells

Time-dependent first-principles study of optical response of BaTiO₃ quantum dots coupled with silver nanowires*

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Kerr nonlinearity due to intersubband transitions in a three-level InAs/GaAs quantum dot: the impact of a wetting layer on dispersion curves

Cited by 17 publications

References 41 publications

Synthesis and characterisation of MoS2 quantum dots by liquid nitrogen quenching

Synthesis and characterisation of MoS2 quantum dots by liquid nitrogen quenching

Phase-dependent intersubband optical properties of asymmetric AlGaAs/GaAs coupled quantum wells

Time-dependent first-principles study of optical response of BaTiO3 quantum dots coupled with silver nanowires*

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Synthesis and characterisation of MoS₂ quantum dots by liquid nitrogen quenching

Synthesis and characterisation of MoS₂ quantum dots by liquid nitrogen quenching

Time-dependent first-principles study of optical response of BaTiO₃ quantum dots coupled with silver nanowires*