Download or read book Near field Optical Spectroscopy of Two dimensional Materials written by Sandro Mignuzzi and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Spectroscopy of Two Dimensional Graphene and Boron Nitride written by Long Ju and published by . This book was released on 2015 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes the use of optical spectroscopy in studying the physical properties of two dimensional nano materials like graphene and hexagonal boron nitride. Compared to bulk materials, atomically thin two dimensional materials have a unique character that is the strong dependence of physical properties on external control. Both electronic band structure and chemical potential can be tuned in situ by electric field-which is a powerful knob in experiment. Therefore the optical study at atomic thickness scale can greatly benefit from modern micro-fabrication technique and electric control of the material properties. As will be shown in this dissertation, such control of both gemometric and physical properties enables new possibilities of optical spectroscopic measurement as well as opto-electronic studies. Other experimental techniques like electric transport and scanning tunneling microscopy and spectroscopy are also combined with optical spectroscopy to reveal the physics that is beyond the reach of each individual technique. There are three major themes in the dissertation. The first one is focused on the study of plasmon excitation of Dirac electrons in monolayer graphene. Unlike plasmons in ordinary two dimensional electron gas, plasmons of 2D electrons as in graphene obey unusual scaling laws. We fabricate graphene micro-ribbon arrays with photolithography technique and use optical absorption spectroscopy to study its absorption spectrum. The experimental result demonstrates the extraordinarily strong light-plasmon coupling and its novel dependence on both charge doping and geometric dimensions. This work provides a first glance at the fundamental properties of graphene plasmons and forms the basis of an emerging subfield of graphene research and applications such as graphene terahertz metamaterials. The second part describes the opto-electronic response of heterostructures composed of graphene and hexagonal boron nitride. We found that there is a charge transfer process between graphene and BN when the exposure of visible light is introduced. We show this photo-induced doping in graphene resembles the modulation doping technique in traditional semiconductor heterojunctions, where a charge doping is introduced while the high mobility is maintained. This work reveals importance of interactions between stacked 2D materials on the overall properties and demonstrate a repeatable and convenient way of fabricating high quality graphene devices with active control of doping patterning. Along this direction, we did further STM experiment to visualize and manipulate charged defects in boron nitride with the help of graphene. The last theme is about the interesting properties of bilayer graphene, which is to some extent more interesting than monolayer graphene due to its electric-eld dependent band structures. Firstly, we visualized the stacking boundary within exfoliated bilayer graphene by near field infrared microscopy. In dual-gated field-effect-transistor devices fabricated on the boundaries, we demonstrated the existence of topologically protected one dimensional conducting channels at the boundary through electric transport measurement. The 1D boundary states also demonstrated the first graphene-based valleytronic device. The topics we are going to talk about in this thesis are quite diversified. Just like the versatile nature of optical spectroscopy, we never limit ourself to a specific technique and do incremental things. Most of the experiments are driven by the important and interesting problems in the two dimensional materials field and we chose the right tool and conceive the right experiment to answer that question. Both pure optical methods and combinations with electric transport and STM measurements were used. I believe the flexibility of optical spectroscopy and its compatibility with other experimental techniques provide a powerful toolbox to explore many possibilities beyond the reach of a single experimental approach. And such a way of doing experiments is very much enjoyable for me.
Download or read book Two Dimensional Correlation Spectroscopy written by Isao Noda and published by John Wiley & Sons. This book was released on 2005-01-14 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: A valuable tool for individuals using correlation spectroscopy and those that want to start using this technique. Noda is known as the founder of this technique, and together with Ozaki, they are the two biggest names in the area First book on 2D vibrational and optical spectroscopy - single source of information, pulling together literature papers and reveiws Growing number of applications of this methodology - book now needed for people thinking of using this technique Limitations and benefits discussed and comparisons made with 2D NMR Discusses 20 optical and vibrational spectroscopy (IR, Raman, UV, Visible)
Download or read book Two Dimensional Materials for Nonlinear Optics written by Qiang Wang and published by John Wiley & Sons. This book was released on 2023-09-29 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-Dimensional Materials for Nonlinear Optics Comprehensive resource covering concepts, perspectives, and skills required to understand the preparation, nonlinear optics, and applications of two-dimensional (2D) materials Bringing together many interdisciplinary experts in the field of 2D materials with their applications in nonlinear optics, Two-Dimensional Materials for Nonlinear Optics covers preparation methods for various novel 2D materials, such as transition metal dichalcogenides (TMDs) and single elemental 2D materials, excited-state dynamics of 2D materials behind their outstanding performance in photonic devices, instrumentation for exploring the photoinduced excited-state dynamics of the 2D materials spanning a wide time scale from ultrafast to slow, and future trends of 2D materials on a series of issues like fabrications, dynamic investigations, and photonic/optoelectronic applications. Powerful nonlinear optical characterization techniques, such as Z-scan measurement, femtosecond transient absorption spectroscopy, and microscopy, are also introduced. Edited by two highly qualified academics with extensive experience in the field, Two-Dimensional Materials for Nonlinear Optics covers sample topics such as: Foundational knowledge on nonlinear optical properties, and fundamentals and preparation methods of 2D materials with nonlinear optical properties Modulation and enhancement of optical nonlinearity in 2D materials, and nonlinear optical characterization techniques for 2D materials and their applications in a specific field Novel nonlinear optical imaging systems, ultrafast time-resolved spectroscopy for investigating carrier dynamics in emerging 2D materials, and transient terahertz spectroscopy 2D materials for optical limiting, saturable absorber, second and third harmonic generation, nanolasers, and space use With collective insight from researchers in many different interdisciplinary fields, Two-Dimensional Materials for Nonlinear Optics is an essential resource for materials scientists, solid state chemists and physicists, photochemists, and professionals in the semiconductor industry who are interested in understanding the state of the art in the field.
Download or read book Defects in Two Dimensional Materials written by Rafik Addou and published by Elsevier. This book was released on 2022-02-14 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Defects in Two-Dimensional Materials addresses the fundamental physics and chemistry of defects in 2D materials and their effects on physical, electrical and optical properties. The book explores 2D materials such as graphene, hexagonal boron nitride (h-BN) and transition metal dichalcogenides (TMD). This knowledge will enable scientists and engineers to tune 2D materials properties to meet specific application requirements. The book reviews the techniques to characterize 2D material defects and compares the defects present in the various 2D materials (e.g. graphene, h-BN, TMDs, phosphorene, silicene, etc.). As two-dimensional materials research and development is a fast-growing field that could lead to many industrial applications, the primary objective of this book is to review, discuss and present opportunities in controlling defects in these materials to improve device performance in general or use the defects in a controlled way for novel applications. Presents the theory, physics and chemistry of 2D materials Catalogues defects of 2D materials and their impacts on materials properties and performance Reviews methods to characterize, control and engineer defects in 2D materials
Download or read book Near Field Optical Spectroscopy on Photonic Metamaterials written by Daniela Diessel and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2011-06 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most photonic metamaterials consist of basic building blocks which are specifically engineered to exhibit electromagnetic resonances. These determine the optical properties of the material, thus rendering possible novel optical properties, such as magnetic responses at optical frequencies, negative permittivities and permeabilities, and even negative refractive indices. With these characteristics metamaterials expanded the range of what can be realised in optics, stimulating a vibrant and fast-growing field of fundamental research. In this work, the field distributions of resonant modes in selected 2-D metamaterials are investigated experimentally as well as numerically. Spectroscopic experiments are carried out with scanning near-field optical microscopes with aperture probes in collection mode. For the complementing numerical studies a theoretical model of the transmission process through the near-field aperture probes is introduced. This model is discussed and data derived with the model are used to corroborate the experimental results.
Download or read book Two Dimensional Optical Spectroscopy written by Minhaeng Cho and published by CRC Press. This book was released on 2009-06-16 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-Dimensional Optical Spectroscopy discusses the principles and applications of newly emerging two-dimensional vibrational and optical spectroscopy techniques. It provides a detailed account of basic theory required for an understanding of two-dimensional vibrational and electronic spectroscopy. It also bridges the gap between the formal developm
Download or read book Two Dimensional Materials in Nanophotonics written by Yuerui Lu and published by CRC Press. This book was released on 2019-10-31 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional (2D) materials have attracted tremendous interest since the study of graphene in the early 21st century. With their thickness in the angstrom-to-nanometer range, 2D materials, including graphene, transition metal dichalcogenides, phosphorene, silicene, and other inorganic and organic materials, can be an ideal platform to study fundamental many-body interactions because of reduced screening and can also be further engineered for nanophotonic applications. This book compiles research outcomes of leading groups in the field of 2D materials for nanophotonic physics and devices. It describes research advances of 2D materials for various nanophotonic applications, including ultrafast lasers, atomically thin optical lenses, and gratings to inelastically manipulate light propagation, their integrations with photonic nanostructures, and light–matter interactions. The book focuses on actual applications, while digging into the physics underneath. It targets advanced undergraduate- and graduate-level students of nanotechnology and researchers in nanotechnology, physics, and chemistry, especially those with an interest in 2D materials.
Download or read book Near Field Optics written by D.W. Pohl and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scanning near-field optical microscopy (SNOM, also known as NSOM) is a new local probe technique with a resolving power of 10--50 nm. Not being limited by diffraction, near-field optics (NFO) opens new perspectives for optical characterization and the understanding of optical phenomena, in particular in biology, microelectronics and materials science. SNOM, after first demonstrations in '83/'84, has undergone a rapid development in the past two to four years. The increased interest has been largely stimulated by the wealth of optical properties that can be investigated and the growing importance of characterization on the nanometer scale in general. Examples include the use of fluorescence, birefrigence and plasmon effects for applications in particular in biology, microelectronics and materials science, to name just a few. This volume emerged from the first international meeting devoted exclusively to NFO, and comprises a complete survey of the 1992 activities in the field, in particular the variety of instrumental techniques that are currently being explored, the demonstration of the imaging capabilities as well as theoretical interpretations - a highly nontrivial task. The comprehensive collection of papers devoted to these and related subjects make the book a valuable tool for anybody interested in near-field optics.
Download or read book 2D Nanoscale Heterostructured Materials written by Satyabrata Jit and published by Elsevier. This book was released on 2020-05-09 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Nanoscale Heterostructured Materials: Synthesis, Properties, and Applications assesses the current status and future prospects for 2D materials other than graphene (e.g., BN nanosheets, MoS2, NbSe2, WS2, etc.) that have already been contemplated for both low-end and high-end technological applications. The book offers an overview of the different synthesis techniques for 2D materials and their heterostructures, with a detailed explanation of the many potential future applications. It provides an informed overview and fundamentals properties related to the 2D Transition metal dichalcogenide materials and their heterostructures. The book helps researchers to understand the progress of this field and points the way to future research in this area. Explores synthesis techniques of newly evolved 2D materials and their heterostructures with controlled properties Offers detailed analysis of the fundamental properties (via various experimental process and simulations techniques) of 2D heterostructures materials Discusses the applications of 2D heterostructured materials in various high-performance devices
Download or read book Chemical Imaging Analysis written by Freddy Adams and published by Elsevier. This book was released on 2015-06-06 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical Imaging Analysis covers the advancements made over the last 50 years in chemical imaging analysis, including different analytical techniques and the ways they were developed and refined to link the composition and structure of manmade and natural materials at the nano/micro scale to the functional behavior at the macroscopic scale. In a development process that started in the early 1960s, a variety of specialized analytical techniques was developed – or adapted from existing techniques – and these techniques have matured into versatile and powerful tools for visualizing structural and compositional heterogeneity. This text explores that journey, providing a general overview of imaging techniques in diverse fields, including mass spectrometry, optical spectrometry including X-rays, electron microscopy, and beam techniques. Provides comprehensive coverage of analytical techniques used in chemical imaging analysis Explores a variety of specialized techniques Provides a general overview of imaging techniques in diverse fields
Download or read book Application of Near Field Optics to Semiconductor Materials Characterization written by and published by . This book was released on 1999 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This grant supported a program for local spectroscopic studies of semiconductor nanostructure materials. Our work has looked at the various types of techniques of near field optics and pursued the options that are optimized for the optical spectroscopy of semiconductor nanostructures. The thrust of the research has involved the use of solid immersion lenses. This form of near field optics strikes a balance between the need for high spatial resolution and high optical throughput. We have demonstrated that these techniques can be implemented within the context of a cryogenic system and obtain spatial resolution of order lambda3. We have used these techniques to characterize naturally occurring quantum dots in thin GaAs quantum wells. Our studies reveal the surprising fact that these samples have not only zero dimensional excitons but also two dimensional excitons. In fact, most of the material plays host to the two dimensional species while the zero dimensional species occupies only 1-3% of the sample. This result is surprising because all of the light emission comes from the zero dimensional exciton. The two dimensional exciton is observed using photoluminescence excitation diffusion, a technique wherein we are able to generate a local optical excitation and watch it diffuse.
Download or read book Probing the Response of Two Dimensional Crystals by Optical Spectroscopy written by Yilei Li and published by Springer. This book was released on 2015-11-09 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the study of the optical response of new atomically thin two-dimensional crystals, principally the family of transition metal dichalcogenides like MoS2. One central theme of the thesis is the precise treatment of the linear and second-order nonlinear optical susceptibilities of atomically thin transition metal dichalcogenides. In addition to their significant scientific interest as fundamental material responses, these studies provide essential knowledge and convenient characterization tools for the application of these 2D materials in opto-electronic devices. Another important theme of the thesis is the valley physics of atomically thin transition metal dichalcogenides. It is shown that the degeneracy in the valley degree of freedom can be lifted and a valley polarization can be created using a magnetic field, which breaks time reversal symmetry in these materials. These findings enhance our basic understanding of the valley electronic states and open up new opportunities for valleytronic applications using two-dimensional materials.
Download or read book Raman Spectroscopy of Two Dimensional Materials written by Ping-Heng Tan and published by Springer. This book was released on 2018-12-30 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book shows the electronic, optical and lattice-vibration properties of the two-dimensional materials which are revealed by the Raman spectroscopy. It consists of eleven chapters covering various Raman spectroscopy techniques (ultralow-frequency, resonant Raman spectroscopy, Raman imaging), different kinds of two-dimensional materials (in-plane isotropy and anisotropy materials, van der Waals heterostructures) and their physical properties (double-resonant theory, surface and interface effect). The topics include the theory origin, experimental phenomenon and advanced techniques in this area. This book is interesting and useful to a wide readership in various fields of condensed matter physics, materials science and engineering.
Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Imaging Spectroscopy of Heterogeneous Two dimensional Materials written by Robin Havener and published by . This book was released on 2014 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterogeneities in two-dimensional (2D) materials, including variations in layer number and stacking order, spatial variations in chemical composition, and point defects, may provide these systems with a variety of unique optical and electronic properties. Many of these structures form inherently when 2D materials are produced on a large scale with chemical vapor deposition (CVD), and artificial heterojunctions between different 2D materials can also be produced by design. In this work, we address the challenges of visualizing the local structure and composition of heterogeneous 2D materials, and of establishing clear relationships between these structural features and the materials' properties. For this purpose, we first introduce two novel optical imaging spectroscopy techniques: DUV-Vis-NIR hyperspectral microscopy and widefield Raman imaging. These techniques enable comprehensive, all-optical mapping of chemical composition in lateral 2D heterojunctions, graphene visualization on arbitrary substrates, large-scale studies of defect distribution in CVD-grown samples, and real-time imaging of dynamic processes. They can also determine the optical response of an unknown 2D material, and in combination with existing high resolution imaging tools such as dark-field transmission electron microscopy, they can be used to establish quantitative structure-property relationships for a variety of 2D heterostructures. We next apply these methods to the first comprehensive study of the optical properties of twisted bilayer graphene (tBLG), a heterostructure where two graphene layers are rotated by a relative angle ([theta]), relating the optical conductivity and Raman spectra to [theta] for many tBLG samples. Our results establish the importance of interlayer coupling in tBLG at all [theta], and our data suggest that unique many-body effects play vital roles in both the optical absorption and Raman response of tBLG. These findings provide a framework for understanding the effects of the [theta] degree of freedom in other stacked 2D materials, and the suite of techniques that we have developed will play a key role in the characterization of heterogeneous 2D materials for years to come.
Download or read book Handbook of Spectroscopy written by G¿nter Gauglitz and published by John Wiley & Sons. This book was released on 2014-05-05 with total page 2011 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second, thoroughly revised, updated and enlarged edition provides a straightforward introduction to spectroscopy, showing what it can do and how it does it, together with a clear, integrated and objective account of the wealth of information that may be derived from spectra. It also features new chapters on spectroscopy in nano-dimensions, nano-optics, and polymer analysis. Clearly structured into sixteen sections, it covers everything from spectroscopy in nanodimensions to medicinal applications, spanning a wide range of the electromagnetic spectrum and the physical processes involved, from nuclear phenomena to molecular rotation processes. In addition, data tables provide a comparison of different methods in a standardized form, allowing readers to save valuable time in the decision process by avoiding wrong turns, and also help in selecting the instrumentation and performing the experiments. These four volumes are a must-have companion for daily use in every lab.
