Download or read book Optical Spectroscopy of Low Dimensional Semiconductors written by G. Abstreiter and published by Springer. This book was released on 1997-09-30 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a September 1996 meeting, in sections on quantum films and superlattices, quantum wires, and quantum dots. Coverage includes basic physics aspects, novel technology and material fabrication tools, characterization methods, and new devices, with special attention to quantum wire and quantum dot lasers. Specific topics include inelastic light scattering by electrons in low-dimensional semiconductors, band-gap renormalization in quasi-one-dimensional systems, conductance in nanowires, and fabrication of quantum dots for semiconductor lasers with confined electrons and photons. Annotation copyrighted by Book News, Inc., Portland, OR

Download or read book Abt 3 Handschriftlicher Nachla Bd 5 Metaphysik written by and published by . This book was released on 1928 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Spectroscopy of Semiconductor Nanostructures written by Eougenious L. Ivchenko and published by Alpha Science Int'l Ltd.. This book was released on 2005 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume looks at optical spectroscopy of semiconductir nanostructures. Some of the topics it covers include: kingdom of nanostructures; quantum confinement in low-dimensional systems; resonant light reflection; and transmission and absorption.

Download or read book Devices Based on Low Dimensional Semiconductor Structures written by M. Balkanski and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-dimensional semiconductor quantum structures are a major, high-technological development that has a considerable industrial potential. The field is developing extremely rapidly and the present book represents a timely guide to the latest developments in device technology, fundamental properties, and some remarkable applications. The content is largely tutorial, and the book could be used as a textbook. The book deals with the physics, fabrication, characteristics and performance of devices based on low-dimensional semiconductor structures. It opens with fabrication procedures. The fundamentals of quantum structures and electro-optical devices are dealt with extensively. Nonlinear optical devices are discussed from the point of view of physics and applications of exciton saturation in MQW structures. Waveguide-based devices are also described in terms of linear and nonlinear coupling. The basics of pseudomorphic HEMT technology, device physics and materials layer design are presented. Each aspect is reviewed from the elementary basics up to the latest developments. Audience: Undergraduates in electrical engineering, graduates in physics and engineering schools. Useful for active scientists and engineers wishing to update their knowledge and understanding of recent developments.

Download or read book Nano optical Spectroscopy of Low Dimensional Semiconductor written by Wei Bao and published by . This book was released on 2015 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: The necessity to push the spatial resolution of optical microscopy and spectroscopy beyond the diffraction limit has been of high interest for almost three decades starting with the idea of using an aperture smaller than the diffraction limit by Ash and Nicholls (Nature 237, 510 - 512) and first examples on nano spectroscopy by Betzig and Trautman (Science 257, 189-195), who advertised: "two of the most exciting possibilities are localized optical spectroscopy of semiconductors and fluorescence imaging of living cells". However, albeit its enormous potential for the advancement of nano science to study at the critical length scales physical and chemical properties of nano materials that can be accessed only optically, nano optics has developed only a niche existence. The reasons are many limitations of present nano optics, which advanced specific aspects e.g. high local field intensity via the concept of optical antennae (Science 308, 1607-1609) but with major trade offs such as lack of band width, background of diffraction limited light or intrinsic geometries that enable only the study of e.g. monolayers of molecules squeezed between metal substrate and a metal tip. Here we present a wildly applicable solution to the nanoscale spectroscopy problem with the concept of a far-field to near field optical transformer that does not require the trade offs made in the past and combines record near field enhancement, enormous bandwidth, background free and complete sample independence to perform nano scale optical spectroscopy. The "campanile" transformer is the missing element that enables to perform the whole bandwidth of optical spectroscopy modalities. In the first part of this thesis, the finite element method is used compare the properties of this "campanile" structure with conventional aperture and apertureless NSOM tips, as well as state-of-the-art adiabatic-compression-type probes. These benchmarks elucidate a number of advantages of the campanile design, showing that its unique characteristics are crucial for optical techniques such as nano-Raman and nano-IR spectroscopy and nano-photoluminescence studies. In the second part of the thesis, we have experimentally used the campanile transformer to perform indeed local optical spectroscopy of semiconducting Indium Phosphite nanowires (InP NW),1D semiconductor, taking advantage of enhancement, bandwidth as well as the ability to excite and collect through the campanile, to show the influence of trap states on the local excitation energy and charge recombination rate. InP NWs have fascinating opto-electronic properties (Science 293, 1455-1457) and are expected to be the functional elements of next generation opto-electronic devices. However, many of the observed optical phenomena in nanowire systems are not understood due to the lack of spatial resolution. This work provides the necessary insight to start understanding the optical properties of nanowire and nano crystals systems. We demonstrate how the concept of optical campanile transformers convert bi-directional light with high efficiency between far and near field over a bandwidth spanning the visible to the near IR. Utilizing the campanile to perform hyperspectral nano optical spectroscopy on InP NWs revealed strong heterogeneity of the local photoluminescence, both in local intensity and spectral response, along individual NWs, due to the local influence of trap states. In the last part of the thesis, we present the first nano-optical investigation of 2D transition metal dichalcogenides (TMDCs). Establishing a breakthrough solution to the "nanospectroscopy imaging" problem for these materials, we cross the boundary from insufficient to sufficient optical spatial resolution, mapping critical optoelectronic properties at their native length scales. In doing so, we uncover new optoelectronic regions and spatially-varying features in CVD-grown MoS2 that were hidden in prior optical studies. We discover an unexpected edge region in synthetic MoS2 (~300 nm wide) that acts as a collection of disordered states effectively localizing carriers and excitons. Moreover, we show that significant nanoscale optoelectronic heterogeneity is present even within more "conventional" regions, and directly visualize the optoelectronic effects of key features such defects and edges - highly-soughtafter information that was unobtainable previously. By revealing key structure-function relationships at the proper length scales, these findings directly impact nearly all anticipated atomically-thin device technologies including novel quantum-optical circuitry, bio sensors and valley-based electronics.

Download or read book Excitons in Low Dimensional Semiconductors written by Stephan Glutsch and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author develops the effective-mass theory of excitons in low-dimensional semiconductors and describes numerical methods for calculating the optical absorption including Coulomb interaction, geometry, and external fields. The theory is applied to Fano resonances in low-dimensional semiconductors and the Zener breakdown in superlattices. Comparing theoretical results with experiments, the book is essentially self-contained; it is a hands-on approach with detailed derivations, worked examples, illustrative figures, and computer programs. The book is clearly structured and will be valuable as an advanced-level self-study or course book for graduate students, lecturers, and researchers.

Download or read book Physics of Low Dimensional Semiconductor Structures written by Paul N. Butcher and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting the latest advances in artificial structures, this volume discusses in-depth the structure and electron transport mechanisms of quantum wells, superlattices, quantum wires, and quantum dots. It will serve as an invaluable reference and review for researchers and graduate students in solid-state physics, materials science, and electrical and electronic engineering.

Download or read book Optical Properties of Low dimensional Semiconductors written by Joshua D. Wood and published by . This book was released on 2009 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low dimensional Semiconductors written by M. J. Kelly and published by Clarendon Press. This book was released on 1995-11-23 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text is a first attempt to pull together the whole of semiconductor science and technology since 1970 in so far as semiconductor multilayers are concerned. Material, technology, physics and device issues are described with approximately equal emphasis, and form a single coherant point of view. The subject matter is the concern of over half of today's active semiconductor scientists and technologists, the remainder working on bulk semiconductors and devices. It is now routine to design and the prepare semiconductor multilayers at a time, with independent control over the dropping and composition in each layer. In turn these multilayers can be patterned with features that as a small as a few atomic layers in lateral extent. The resulting structures open up many new ares of exciting solid state and quantum physics. They have also led to whole new generations of electronic and optoelectronic devices whose superior performance relates back to the multilayer structures. The principles established in the field have several decades to go, advancing towards the ultimate of materials engineering, the design and preparation of solids atom by atom. The book should appeal equally to physicists, electronic engineers and materials scientists.

Download or read book The Physics of Low dimensional Semiconductors written by John H. Davies and published by Cambridge University Press. This book was released on 1998 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: The composition of modern semiconductor heterostructures can be controlled precisely on the atomic scale to create low-dimensional systems. These systems have revolutionised semiconductor physics, and their impact on technology, particularly for semiconductor lasers and ultrafast transistors, is widespread and burgeoning. This book provides an introduction to the general principles that underlie low-dimensional semiconductors. As far as possible, simple physical explanations are used, with reference to examples from actual devices. The author shows how, beginning with fundamental results from quantum mechanics and solid-state physics, a formalism can be developed that describes the properties of low-dimensional semiconductor systems. Among numerous examples, two key systems are studied in detail: the two-dimensional electron gas, employed in field-effect transistors, and the quantum well, whose optical properties find application in lasers and other opto-electronic devices. The book includes many exercises and will be invaluable to undergraduate and first-year graduate physics or electrical engineering students taking courses in low-dimensional systems or heterostructure device physics.

Download or read book Atom Probe Based Correlative Multi Microscopy for the Study of Low Dimensional Semiconductors written by Lorenzo Mancini and published by . This book was released on 2016 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports on the correlation of optical and structural properties of selected low dimensional semiconductor systems, obtained through the application of an original correlative multi-microscopy approach based on Atom Probe Tomography (APT), Scanning Transmission Electron Microscopy (STEM)/electron tomography and (time-resolved) micro-photoluminescence ((TR)PL).The analysis of nanoscale tip specimens with the three techniques aims to correlate the structural properties of single nanostructures imaged by STEM and/or APT, with their optical properties observed by optical spectroscopy. This correlation is performed within the framework of the effective mass approximation, using the APT (or STEM) 3-dimensional chemical mapping as input data for calculations, obtaining insight into the electron and hole spatial probability distributions in addition to the transition energies. In order to ensure the reliability of APT composition measurements required for performing effective mass simulations, a study of the biases affecting the measured compositions of four binary compounds (GaN, AlN, ZnO and MgO), two ternary alloys (InGaN and AlGaN) and one doped binary oxide (Tb:ZnO) was performed. A systematic analysis of the atomic fraction dependence of different atomic species on the experimental parameters allowed concluding that measured compositions of the studied binary compounds mostly depends on the surface field at which the evaporation process takes place, with an overestimation of the metallic element fraction at low field. This behavior can be explained in terms of preferential evaporationof metallic elements at high field and loss of neutral molecules at low field (evaporating as neutrals or formed by dissociation of molecular ions). The ternary compounds and doped ZnO reflect the behavior observed in binary compounds, but while for InGaN and AlGaN a good assessment of the site fractions of metallic elements is possible under suitable conditions of analysis, an unambiguous quantification of Tb content in ZnO could not be attained. A statistically correlative approach, for which APT, STEM and PL analyses are not performed on the same object, was applied for the analysis of GaAs/AlGaAs quantum dot (QD)-like structures self-assembled within coreshell nanowires and of a GaN/AlGaN multi-quantum well (QW) structure. Notwithstanding the statistical nature of the correlative study, this approach was able to prove in the former system the formation of quantum confining heterostructures from composition fluctuations within the AlGaAs barriers. For the latter, the structure of the layered system was correlated with both the temperature dependence of the PL signal intensity and the excitonic decay times issued by TRPL.. The application of the correlative multi-microscopy on optically active field emission tips prepared out of non-polar InGaN/GaN QWs extracted from the side facets of core-shell microwires and of a GaN/AlN Stranski-Krastanov QD system allowed respectively for the study of the effect of stacking faults on the optical properties of single QWs and for the assessment of the influence of QDs thickness fluctuations on transition energies, charge carriers localization, and biexciton-exciton cascade processes. The ensemble of these results not only provides a deep insight into the relationship between structural and functional properties of semiconductor heterostructures, but also constitutes the first step towards the development of an instrument that will allow performing simultaneously APT and PL analyses on optically active field emission tips. A prototype of this instrument has been developed and first optical spectroscopy results were obtained.

Download or read book Optical Spectroscopy of Self Organised Low Dimensional Structures written by K. J. M. Berwick and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Properties of Semiconductor Nanostructures written by Marcin L. Sadowski and published by Springer. This book was released on with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical methods for investigating semiconductors and the theoretical description of optical processes have always been an important part of semiconductor physics. Only the emphasis placed on different materials changes with time. Here, a large number of papers are devoted to quantum dots, presenting the theory, spectroscopic investigation and methods of producing such structures. Another major part of the book reflects the growing interest in diluted semiconductors and II-IV nanosystems in general. There are also discussions of the fascinating field of photonic crystals. `Classical' low dimensional systems, such as GsAs/GaAlAs quantum wells and heterostructures, still make up a significant part of the results presented, and they also serve as model systems for new phenomena. New materials are being sought, and new experimental techniques are coming on stream, in particular the combination of different spectroscopic modalities.

Download or read book Optical Switching in Low Dimensional Systems written by Hartmut Haug and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains all the papers presented at the NATO workshop on "Optical Switching in Low Dimensional Systems" held in Marbella, Spain from October 6th to 8th, 1988. Optical switching is a basic function for optical data processing, which is of technological interest because of its potential parallelism and its potential speed. Semiconductors which exhibit resonance enhanced optical nonlinearities in the frequency range close to the band edge are the most intensively studied materials for optical bistability and fast gate operation. Modern crystal growth techniques, particularly molecular beam epitaxy, allow the manufacture of semiconductor microstructures such as quantum wells, quantum wires and quantum dots in which the electrons are only free to move in two, one or zero dimensions, of the optically excited electron-hole pairs in these low respectively. The spatial confinement dimensional structures gives rise to an enhancement of the excitonic nonlinearities. Furthermore, the variations of the microstruture extensions, of the compositions, and of the doping offer great new flexibility in engineering the desired optical properties. Recently, organic chain molecules (such as polydiacetilene) which are different realizations of one dimensional electronic systems, have been shown also to have interesting optical nonlinearities. Both the development and study of optical and electro-optical devices, as well as experimental and theoretical investigations of the underlying optical nonlinearities, are contained in this book.

Download or read book Optical Investigations of Low dimensional Semiconductor Systems written by Michael Kenneth Ellis and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Investigations of Low dimensional Semiconductor Structures written by Daniel James Sercombe and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Characterisation of Low Dimensional Semiconductors written by Rhys Williams and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: