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 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 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 Low Dimensional Semiconductor Structures written by Hilmi Ünlü and published by Springer Science & Business Media. This book was released on 2012-09-14 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting with the first transistor in 1949, the world has experienced a technological revolution which has permeated most aspects of modern life, particularly over the last generation. Yet another such revolution looms up before us with the newly developed capability to control matter on the nanometer scale. A truly extraordinary research effort, by scientists, engineers, technologists of all disciplines, in nations large and small throughout the world, is directed and vigorously pressed to develop a full understanding of the properties of matter at the nanoscale and its possible applications, to bring to fruition the promise of nanostructures to introduce a new generation of electronic and optical devices. The physics of low dimensional semiconductor structures, including heterostructures, superlattices, quantum wells, wires and dots is reviewed and their modeling is discussed in detail. The truly exceptional material, Graphene, is reviewed; its functionalization and Van der Waals interactions are included here. Recent research on optical studies of quantum dots and on the physical properties of one-dimensional quantum wires is also reported. Chapters on fabrication of nanowire – based nanogap devices by the dielectrophoretic assembly approach. The broad spectrum of research reported here incorporates chapters on nanoengineering and nanophysics. In its presentation of tutorial chapters as well as advanced research on nanostructures, this book is ideally suited to meet the needs of newcomers to the field as well as experienced researchers interested in viewing colleagues’ recent advances.
Download or read book Optical Properties Of Low dimensional Materials written by Yoshihiko Kanemitsu and published by World Scientific. This book was released on 1996-01-18 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book surveys recent experimental and theoretical studies on optical properties of low-dimensional materials, e.g., artificial crystals in zeolites, C60 and its related compounds, silicon nanostructures including porous Si, II-VI and III-V semiconductor quantum structures, and Pb-based natural quantum-well systems. The eight excellent detailed review articles are written by authorities on each field in Japan. All the materials introduced in this book yield new optical phenomena originating from their mesoscopic and low-dimensional characters contributing to a new research field of condensed matter and optical physics.
Download or read book Optical Properties And Spectroscopy Of Nanomaterials written by Jin Zhong Zhang and published by World Scientific. This book was released on 2009-07-21 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical properties are among the most fascinating and useful properties of nanomaterials and have been extensively studied using a variety of optical spectroscopic techniques. A basic understanding of the optical properties and related spectroscopic techniques is essential for anyone who is interested in learning about nanomaterials of semiconductors, insulators or metal. This is partly because optical properties are intimately related to other properties and functionalities (e.g. electronic, magnetic, and thermal) that are of fundamental importance to many technological applications, such as energy conversion, chemical analysis, biomedicine, optoelectronics, communication, and radiation detection.Intentionally designed for upper-level undergraduate students and beginning graduate students with some basic knowledge of quantum mechanics, this book provides the first systematic coverage of optical properties and spectroscopic techniques of nanomaterials.
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 Properties of Semiconductor Nanocrystals written by S. V. Gaponenko and published by Cambridge University Press. This book was released on 1998-10-28 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the optical properties of low-dimensional semiconductor structures, a hot research area - for graduate students and researchers.
Download or read book Optical Properties of Low Dimensional Silicon Structures written by B. Bensahel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: The workshop on "Optical Properties of Low Dimensional Silicon sL Structures" was held in Meylan, France on March, I yd, 1993. The workshop took place inside the facilities of France Telecom- CNET. Around 45 leading scientists working on this rapidly moving field were in attendance. Principal support was provided by the Advanced Research Workshop Program of the North Atlantic Treaty Organisation (NATO). French Delegation a l'Armement and CNET gave also a small financial grant, the organisational part being undertaken by the SEE and CNET. There is currently intense research activity worldwide devoted to the optical properties of low dimensional silicon structures. This follow the recent discovery of efficient visible photoluminescence (PL) from highly porous silicon. This workshop was intended to bring together all the leading European scientists and laboratories in order to reveal the state of the art and to open new research fields on this subject. A large number of invited talks took place (12) together with regular contribution (20). The speakers were asked to leave nearly 1/3 of the time to the discussion with the audience, and that promoted both formal and informal discussions between the participants.
Download or read book Progress in Nanoscale and Low Dimensional Materials and Devices written by Hilmi Ünlü and published by Springer. This book was released on 2023-10-21 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes most recent progress in the properties, synthesis, characterization, modelling, and applications of nanomaterials and nanodevices. It begins with the review of the modelling of the structural, electronic and optical properties of low dimensional and nanoscale semiconductors, methodology of synthesis, and characterization of quantum dots and nanowires, with special attention towards Dirac materials, whose electrical conduction and sensing properties far exceed those of silicon-based materials, making them strong competitors. The contributed reviews presented in this book touch on broader issues associated with the environment, as well as energy production and storage, while highlighting important achievements in materials pertinent to the fields of biology and medicine, exhibiting an outstanding confluence of basic physical science with vital human endeavor. The subjects treated in this book are attractive to the broader readership of graduate and advanced undergraduate students in physics, chemistry, biology, and medicine, as well as in electrical, chemical, biological, and mechanical engineering. Seasoned researchers and experts from the semiconductor/device industry also greatly benefit from the book’s treatment of cutting-edge application studies.
Download or read book Optical Properties of Low dimensional Semiconductor Nanostructures written by Jantje Hendrika Blokland and published by . This book was released on 2010 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Nano optics written by Nicolas H. Bonadeo and published by . This book was released on 1999 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconductor Photonics of Nanomaterials and Quantum Structures written by Arash Rahimi-Iman and published by Springer Nature. This book was released on 2021-04-23 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the wider field of functional nanomaterials sciences, with a strong emphasis on semiconductor photonics. Whether you are studying photonic quantum devices or just interested in semiconductor nanomaterials and their benefits for optoelectronic applications, this book offers you a pedagogical overview of the relevant subjects along with topical reviews. The book discusses different yet complementary studies in the context of ongoing international research efforts, delivering examples from both fundamental and applied research to a broad readership. In addition, a hand-full of useful optical techniques for the characterization of semiconductor quantum structures and materials are addressed. Moreover, nanostructuring methods for the production of low-dimensional systems, which exhibit advantageous properties predominantly due to quantum effects, are summarized. Science and engineering professionals in the interdisciplinary domains of nanotechnology, photonics, materials sciences, and quantum physics can familiarize themselves with selected highlights with eyes towards photonic applications in the fields of two-dimensional materials research, light–matter interactions, and quantum technologies.
Download or read book Optical Properties of Low dimensional Semiconductor Nanostructures Under High Pressure written by Juan Sebastian Reparaz and published by . This book was released on 2008 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Dimensional Semiconductor Structures written by Hilmi Ünlü and published by Springer Science & Business Media. This book was released on 2012-09-12 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Starting with the first transistor in 1949, the world has experienced a technological revolution which has permeated most aspects of modern life, particularly over the last generation. Yet another such revolution looms up before us with the newly developed capability to control matter on the nanometer scale. A truly extraordinary research effort, by scientists, engineers, technologists of all disciplines, in nations large and small throughout the world, is directed and vigorously pressed to develop a full understanding of the properties of matter at the nanoscale and its possible applications, to bring to fruition the promise of nanostructures to introduce a new generation of electronic and optical devices. The physics of low dimensional semiconductor structures, including heterostructures, superlattices, quantum wells, wires and dots is reviewed and their modeling is discussed in detail. The truly exceptional material, Graphene, is reviewed; its functionalization and Van der Waals interactions are included here. Recent research on optical studies of quantum dots and on the physical properties of one-dimensional quantum wires is also reported. Chapters on fabrication of nanowire – based nanogap devices by the dielectrophoretic assembly approach. The broad spectrum of research reported here incorporates chapters on nanoengineering and nanophysics. In its presentation of tutorial chapters as well as advanced research on nanostructures, this book is ideally suited to meet the needs of newcomers to the field as well as experienced researchers interested in viewing colleagues’ recent advances.
Download or read book Nano Optoelectronics written by Marius Grundmann and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traces the quest to use nanostructured media for novel and improved optoelectronic devices. Leading experts - among them Nobel laureate Zhores Alferov - write here about the fundamental concepts behind nano-optoelectronics, the material basis, physical phenomena, device physics and systems.
