Abstract:This paper discusses the growth and the properties of semiconductor nanostructures based on self-assembled quantum dots (QDs). These QDs confine electrons or excitons in zero-dimension (0D), similar to an artificial atom or to an artificial molecule in the case of coupled QDs with vertical alignment. They are obtained in a simple step during the epitaxy of strained III-V semiconductors such as InAs on GaAs, or InAs on InP. We will elaborate on the unique optical properties and the physics of self-assembled QDs… Show more
“…At present, different SQDs have been manufactured using different growth techniques and where it has been demonstrated that the optical properties exhibited by this type of structures have a strong influence of their morphology and the materials used in their manufacturing process. [5]. On the other hand, the optical solitons were observed for the first time in media that had a high absorption at specific wavelengths known as resonant optical media, but that at a certain minimum power the medium presented a transparent behavior, for this purpose it is known as self-induced transparency SIT.…”
Section: Theoretical Analysismentioning
confidence: 99%
“…Some of the most recent investigations indicate that this type of heterostructures can undergo abrupt changes in the spectral response with minimal variations in their size and morphology, offering important applications to optics, among which are the lasers of new generations, diodes. light emitters, optical multiplexers, biosensors, spectral tuners, quantum computing, logic gates, among others [1][2][3][4][5][6]. Nowadays, it has been possible to combine nanostructures with other polymeric materials such as optical fibers, giving rise to nanocomposites, which are generally composed of several phases such as SiO2, where one or several of its dimensions are found at the nanoscale [6][7][8][9][10].…”
Abstract. In this paper, the potential use of stacked layers of semiconducting nanostructures as optical field sources to optimize the propagation of pulses without losses along nonlinear optical fibers was studied. During this research, we propose the external excitation of stacked layers of semiconductor quantum dots SQDs through an optical source that allows the generation of solitonic waves that are propagated through an optical fiber with non-linear optical characteristics. Theoretically, the soliton formation is studied from the nonlinear interaction between the SQDs and the external optical excitation, considering it as a quantum system of three energy levels. In the study, the non-linear Schrödinger NLSE equation is solved numerically using the Fourier Split-Step method to understand the evolution of the soliton emitted by the SQDs inside an optical fiber with real physical parameters.
“…At present, different SQDs have been manufactured using different growth techniques and where it has been demonstrated that the optical properties exhibited by this type of structures have a strong influence of their morphology and the materials used in their manufacturing process. [5]. On the other hand, the optical solitons were observed for the first time in media that had a high absorption at specific wavelengths known as resonant optical media, but that at a certain minimum power the medium presented a transparent behavior, for this purpose it is known as self-induced transparency SIT.…”
Section: Theoretical Analysismentioning
confidence: 99%
“…Some of the most recent investigations indicate that this type of heterostructures can undergo abrupt changes in the spectral response with minimal variations in their size and morphology, offering important applications to optics, among which are the lasers of new generations, diodes. light emitters, optical multiplexers, biosensors, spectral tuners, quantum computing, logic gates, among others [1][2][3][4][5][6]. Nowadays, it has been possible to combine nanostructures with other polymeric materials such as optical fibers, giving rise to nanocomposites, which are generally composed of several phases such as SiO2, where one or several of its dimensions are found at the nanoscale [6][7][8][9][10].…”
Abstract. In this paper, the potential use of stacked layers of semiconducting nanostructures as optical field sources to optimize the propagation of pulses without losses along nonlinear optical fibers was studied. During this research, we propose the external excitation of stacked layers of semiconductor quantum dots SQDs through an optical source that allows the generation of solitonic waves that are propagated through an optical fiber with non-linear optical characteristics. Theoretically, the soliton formation is studied from the nonlinear interaction between the SQDs and the external optical excitation, considering it as a quantum system of three energy levels. In the study, the non-linear Schrödinger NLSE equation is solved numerically using the Fourier Split-Step method to understand the evolution of the soliton emitted by the SQDs inside an optical fiber with real physical parameters.
“…In the same study by Bugajski and Lewandowski in ref. 29, the doping concentration of n in cm −3 , resulting in spectral broadening of ΔE(n) in eV, can be determined with 10% uncertainty as in eqn (2).…”
Section: Cathodoluminescence Studiesmentioning
confidence: 99%
“…The use of semiconductor quantum dot (QD) structures for optoelectronics 1,2 and photovoltaics 3 is becoming more and more attractive. Due to a delta function like density of states and strong electron and hole confinement, QDs offer a low and temperature-insensitive threshold current density and a large band width for lasing.…”
“…Quantum dots have discrete energy levels like those of a single atom. Therefore, novel optoelectronic devices such as the quantum dot laser [1] and the quantum dot infrared photodetector (QDIP) [2] have become feasible.…”
We report on a three-month undergraduate research project to compute energy levels and their corresponding wavefunctions of an electron confined in a tetrahedral-shaped quantum dot heterostructure. A typical example of such a quantum system is an InAs tetrahedral-shaped quantum dot embedded in a cuboid GaAs matrix. For the simulation we used the Schrödinger equation in three-dimensional Cartesian space. After discretizing the Schrödinger equation by using the finite volume method, the resulting large-scale eigenvalue matrix is solved for eigenvalues and eigenvectors.
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