Search Results for: quantum dot lasers


Quantum Dot Lasers

Quantum Dot Lasers PDF
Author: Victor Mikhailovich Ustinov
Publisher: Oxford University Press on Demand
ISBN: 9780198526797
Size: 12.26 MB
Format: PDF, Mobi
Category : Science
Languages : en
Pages : 290
View: 3957

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A book devoted to the physics and technology of diode lasers based on self-organized quantum dots. It first addresses fundamentals of semiconductor quantum dot fabrication along with structural and electronic properties of quantum dots and secondly, use of self-organized quantum dots in laser structures, their properties and optimization.

Dynamics Of Quantum Dot Lasers

Dynamics of Quantum Dot Lasers PDF
Author: Christian Otto
Publisher: Springer Science & Business Media
ISBN: 3319037862
Size: 47.62 MB
Format: PDF, ePub, Mobi
Category : Science
Languages : en
Pages : 290
View: 3371

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This thesis deals with the dynamics of state-of-the-art nanophotonic semiconductor structures, providing essential information on fundamental aspects of nonlinear dynamical systems on the one hand, and technological applications in modern telecommunication on the other. Three different complex laser structures are considered in detail: (i) a quantum-dot-based semiconductor laser under optical injection from a master laser, (ii) a quantum-dot laser with optical feedback from an external resonator, and (iii) a passively mode-locked quantum-well semiconductor laser with saturable absorber under optical feedback from an external resonator. Using a broad spectrum of methods, both numerical and analytical, this work achieves new fundamental insights into the interplay of microscopically based nonlinear laser dynamics and optical perturbations by delayed feedback and injection.

Quantum Dot Heterostructures

Quantum Dot Heterostructures PDF
Author: Dieter Bimberg
Publisher: John Wiley & Sons
ISBN: 9780471973881
Size: 47.28 MB
Format: PDF
Category : Science
Languages : en
Pages : 338
View: 4093

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Quantum Dot Heterostructures Dieter Bimberg, Marius Grundmann and Nikolai N. Ledentsov Institute of Solid State Physics, Technische Universitï¿1⁄2t Berlin, Germany Quantum dots are nanometer-size semiconductor structures, and represent one of the most rapidly developing areas of current semiconductor research as increases in the speed and decreases in the size of semiconductor devices become more important. They present the utmost challenge to semiconductor technology, making possible fascinating novel devices. This important new reference book focuses on the key phenomena and principles. Chapter 1 provides a brief account of the history of quantum dots, whilst the second chapter surveys the various fabrication techniques used in the past two decades, and introduces the concept of self-organized growth. This topic is expanded in the following chapter, which presents a broad review of self-organization phenomena at surfaces of crystals. Experimental results on growth of quantum dot structures in many different systems and on their structural characterization are presented in Chapter 4. Basic properties of the dots relate to their geometric structure and chemical composition. Numerical modeling of the electronic and optical properties of real dots is presented in Chapter 5, together with general theoretical considerations on carrier capture, relaxation, recombination and properties of quantum dot lasers. Chapters 6 and 7 summarize experimental results on electronic, optical and electrical properties. The book concludes by disoussing highly topical results on quantum-dot-based photonic devices - mainly quantum dot lasers. Quantum Dot Heterostructures is written by some of the key researchers who have contributed significantly to the development of the field, and have pioneered both the theoretical understanding of quantum dot related phenomena and quantum dot lasers. It is of great interest to graduate and postgraduate students, and to researchers in semiconductor physics and technology and optoelectronics.

Single Quantum Dots

Single Quantum Dots PDF
Author: Peter Michler
Publisher: Springer Science & Business Media
ISBN: 9783540140221
Size: 33.34 MB
Format: PDF, Docs
Category : Science
Languages : en
Pages : 352
View: 1518

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Special focus is given to the optical and electronic properties of single quantum dots due to their potential applications in devices operating with single electrons and/or single photons. This includes quantum dots in electric and magnetic fields, cavity-quantum electrodynamics, nonclassical light generation, and coherent optical control of excitons.

Cmos Integration Of High Performance Quantum Dot Lasers For Silicon Photonics

CMOS Integration of High Performance Quantum Dot Lasers for Silicon Photonics PDF
Author: Zihao Wang
Size: 74.92 MB
Format: PDF, ePub, Docs
Category : Metal oxide semiconductors, Complementary
Languages : en
Pages : 131
View: 596

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"Integration of III-V components on Si substrates is required for realizing the promise of Silicon Photonic systems. Specifically, the direct bandgap of many III-V materials is required for light sources, efficient modulators and photodetectors. Several different approaches have been taken to integrate III-V lasers into the silicon photonic platform, such as wafer bonding, direct growth, butt coupling, etc. Here, we have devised a novel laser design that overcomes the above limitations. In our approach, we use InAs quantum dot (QD) lasers monolithically integrated with silicon waveguides and other Si photonic passive components. Due to their unique structures, the QD lasers have been proven by several groups to have the combination of high temperature stability, large modulation bandwidth and low power consumption compared with their quantum well counterparts, which makes it an ideal candidate for Si photonic applications. The first section of this dissertation introduces the theory and novelty of QD lasers, the DC and RF characterization methods of QD lasers are also discussed. The second section is focused on the growth of QD gain chip which a broadband gain chip based on QD inhomogeneous broadening properties was demonstrated. In third section, the lasers devices are built on Si substrate by Pd wafer bonding technology. Firstly, a ridge waveguide QD laser is demonstrated in this section which have better heat dissipation and lower threshold current compared to the unbonded lasers. In section four, a on Si comb laser is also developed. Due to inhomogeneous broadening and ultrafast carrier dynamics, InAs quantum dots have key advantages that make them well suited for Mode-locked lasers (MLLs). In section five, a passively mode-locked InAs quantum dots laser on Si is achieved at a repetition rate of ~7.3 GHz under appropriate bias conditions. In section six, a butt-joint integration configuration based on QD lasers and silicon photonics ring resonator is tested by using to translation stage. In order to achieve the on chip butt-joint integration, an on chip laser facet was created in section seven. A novel facet etching method is developed by using Br-ion beam assist etching (Br-IBAE). In section eight, a Pd-GaAs butt-joint integration platform was proposed, a hybrid tunable QD laser which consist of a QD SOA gain chip butt joint coupled with a passive Si3N4 photonic integrated circuit is proof of concept by using an external booster SOA coupled with a Si3N4 ring reflector feedback circuit. The final section summarized the work discussed in this thesis and also discussed some future approaches by using QD lasers integrated with silicon photonics integrated circuits based on the Pd-GaAs wafer bonding butt-joint coupled platform."--Abstract.

Photonics Of Quantum Dot Nanomaterials And Devices

Photonics of Quantum dot Nanomaterials and Devices PDF
Author: Ortwin Hess
Publisher: World Scientific
ISBN: 1848165226
Size: 55.81 MB
Format: PDF, ePub
Category : Electronic books
Languages : en
Pages : 171
View: 3064

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Quantum dot nano structures are interesting for applications in information technology and play a growing role in data storage, medical and biological applications. Understanding quantum nanomaterials is thus the key for the conception and optimization of novel structures. This monograph gives an overview of the theory and introduces the concepts of advanced computational modelling of quantum dot nanomaterials and devices ranging from phenomenological models up to fully quantum theoretical description.

Quantum Dot Devices

Quantum Dot Devices PDF
Author: Zhiming M. Wang
Publisher: Springer Science & Business Media
ISBN: 1461435706
Size: 24.85 MB
Format: PDF, Docs
Category : Science
Languages : en
Pages : 370
View: 5867

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Quantum dots as nanomaterials have been extensively investigated in the past several decades from growth to characterization to applications. As the basis of future developments in the field, this book collects a series of state-of-the-art chapters on the current status of quantum dot devices and how these devices take advantage of quantum features. Written by 56 leading experts from 14 countries, the chapters cover numerous quantum dot applications, including lasers, LEDs, detectors, amplifiers, switches, transistors, and solar cells. Quantum Dot Devices is appropriate for researchers of all levels of experience with an interest in epitaxial and/or colloidal quantum dots. It provides the beginner with the necessary overview of this exciting field and those more experienced with a comprehensive reference source.

Dynamic Scenarios In Two State Quantum Dot Lasers

Dynamic Scenarios in Two State Quantum Dot Lasers PDF
Author: André Röhm
Publisher: Springer
ISBN: 3658094028
Size: 48.58 MB
Format: PDF, Docs
Category : Science
Languages : en
Pages : 102
View: 7633

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André Röhm investigates the dynamic properties of two-state lasing quantum dot lasers, with a focus on ground state quenching. With a novel semi-analytical approach, different quenching mechanisms are discussed in an unified framework and verified with numerical simulations. The known results and experimental findings are reproduced and parameter dependencies are systematically studied. Additionally, the turn-on dynamics and modulation response curves of two-state lasing devices are presented.

Numerical Modeling Of Narrow Linewidth Quantum Dot Lasers

Numerical Modeling of Narrow linewidth Quantum Dot Lasers PDF
Author: Bjelica, Marko
Publisher: kassel university press GmbH
ISBN: 3737602840
Size: 45.86 MB
Format: PDF, ePub
Category :
Languages : en
Pages : 135
View: 6524

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The quantization of the active laser medium has enabled numerous advances in fiber-optic communications, e.g., higher efficiency of laser diodes, higher modulation bandwidth, lower spectral linewidth of the emitted signal. In recent years the quantum dot lasers have demonstrated a strong potential to continue this trend, therefore, by progressing from standard quantum well to quantum dot designs, it can be expected that the quantum dot lasers will play an increasingly important role in future fiber-optic communications. The research work presented in this dissertation seeks to further develop the quantum dot laser designs and improve the understanding of complex operating conditions affecting the laser linewidth. This is achieved by developing a comprehensive laser simulator, that was applied to design and simulation of edge-emitting lasers and laser arrays. As a result, the optimized laser diodes have demonstrated a significantly lower linewidth compared to equivalent quantum well designs. Due to their narrow linewidth, the realized photonic devices can be a viable solution for high bit rate fiber-optic networks.