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Author : Libai Huang
Publisher :
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.:/5 (747 download)
Download or read book Ultrafast Nonlinear Optical Spectroscopy of Single-walled Carbon Nanotubes written by Libai Huang and published by . This book was released on 2006 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Matthew Werden Graham
Publisher :
ISBN 13 :
Total Pages : 418 pages
Book Rating : 4.:/5 (785 download)
Download or read book Ultrafast Nonlinear Spectroscopy of Semiconducting Carbon Nanotubes written by Matthew Werden Graham and published by . This book was released on 2010 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-walled carbon nanotubes (SWNTs) are often considered the prototypical nanomaterial with their characteristic large aspect ratios, high tensile strength and size tunable physical properties. While their remarkable electrical and mechanical properties have been well studied, the optical properties of semiconducting SWNTs are continuously emerging with recently reported developments such as greatly enhanced fluorescence yields and highly efficient nanotube photodiodes. The scope of optoelectronic applications for SWNTs depends critically on a detailed understanding of their highly congested absorption features consisting of strongly bound excitonic (E11, E22, etc.), vibronic and dark state transitions. Until recently, carbon nanotubes consisted of highly inhomogeneous distributions of tubes types that made advanced spectroscopic studies impractical. Enabled by samples highly enriched in specific tube types, we investigate carbon nanotubes photophysics in real-time by applying a wide range of techniques including transient absorption, photon echo and 2D Fourier transform spectroscopy. Through detailed analysis and simulation of these femtosecond nonlinear results, fundamental properties concerning excitonic structure, exciton-phonon interactions, and the dynamics of coherent excitons for these quasi one-dimensional nanomaterials are revealed. Population relaxation dynamics in SWNTs are probed from the visible to mid-infrared regions using transient absorption or grating spectroscopy. Measurements in mid-IR region reveal a broad excited state absorption feature consistent with previously unobserved intra-excitonic transitions and bound vibrational states. Simulation of visible and near-IR transient absorption results suggest efficient exciton-exciton annihilation occurring by both one-dimensional diffusion or delocalized overlap of coherent excitons depending upon the timescale, state transitions, or temperature investigated (4.4 to 292 K). Throughout all the measurements reported, strong contributions from exciton-exciton scattering processes are evident. The timescales for pure optical dephasing (and the corresponding homogeneous lineshape) were obtained through photon echo measurements. Surprisingly long room temperature dephasing times of 285 fs are reported, suggesting unusually weak exciton-phonon coupling and an inhomogeneously broadened absorption lineshape. At lower temperatures the dephasing induced by SWNT optical phonons is mitigated, and we show how acoustic phonon processes and environmental disorder determines the absorption line-shape properties.
Author : Tatyana Sheps
Publisher :
ISBN 13 : 9781267052445
Total Pages : 49 pages
Book Rating : 4.0/5 (524 download)
Download or read book Nonlinear Optical Spectroscopy of Isolated Single-walled Carbon Nanotubes written by Tatyana Sheps and published by . This book was released on 2011 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-walled and multi-walled carbon nanotubes (SWNTs) and (MWNTs) are low dimensional conductors with unique electronic and electro optic properties. To probe these properties, we investigate the third-order, coherent anti-Stokes (CAS) response of individual SWNTs using a dual color, four-wave-mixing technique. Despite being nanoscale objects much smaller than the wavelength of light, the CAS response allows single SWNTs to be optically imaged with good spatial resolution using picosecond infrared laser excitation pulses and a diffraction limited, confocal microscopy technique. The absence of a pronounced Raman signature shows that the CAS response is dominated by electronic rather than vibrational dynamics. The dependence of the CAS signal on fundamental morphological properties of nanotubes is investigated and characterized. The nonlinear signal is found to depend strongly on nanotube diameter and polarization angle while the dependence on length and individual nanotube chirality is much less clear. The CAS signal is also strongly dependent on metallicity, allowing for straightforward optical discrimination between metallic and semiconducting SWNTs. However, variability of undetermined origin still exists in the CAS signal intensity from a given nanotube type. This variability may depend on electrical contact resistances, charge carrier densities, and local physiochemical effects. Furthermore, identification of the third-order CAS response in SWNTs requires proper accounting for other nonlinear luminescence mechanisms. The SWNT and MWNT optical response is found to contain contributions from competing multi-photon processes, including third-order vibrational and electronic mechanisms as well as second-order fluorescence. The relative intensity of these nonlinear processes is investigated and compared.
Author : Ado Jorio
Publisher : Springer Science & Business Media
ISBN 13 : 3540728651
Total Pages : 734 pages
Book Rating : 4.5/5 (47 download)
Download or read book Carbon Nanotubes written by Ado Jorio and published by Springer Science & Business Media. This book was released on 2007-12-18 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the success of its predecessor, Carbon Nanotubes: Synthesis, Structure, Properties and Applications, this second volume focuses on those areas that have grown rapidly in the past few years. Contributing authors reflect the multidisciplinary nature of the book and are all leaders in their particular areas of research. Among the many topics they cover are graphene and other carbon-like and tube-like materials, which are likely to affect and influence developments in nanotubes within the next five years. Extensive use of illustrations enables you to better understand and visualize key concepts and processes.
Author : Ermin Malic
Publisher : John Wiley & Sons
ISBN 13 : 3527658769
Total Pages : 353 pages
Book Rating : 4.5/5 (276 download)
Download or read book Graphene and Carbon Nanotubes written by Ermin Malic and published by John Wiley & Sons. This book was released on 2013-04-12 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: A first on ultrafast phenomena in carbon nanostructures like graphene, the most promising candidate for revolutionizing information technology and communication The book introduces the reader into the ultrafast nanoworld of graphene and carbon nanotubes, including their microscopic tracks and unique optical finger prints. The author reviews the recent progress in this field by combining theoretical and experimental achievements. He offers a clear theoretical foundation by presenting transparently derived equations. Recent experimental breakthroughs are reviewed. By combining both theory and experiment as well as main results and detailed theoretical derivations, the book turns into an inevitable source for a wider audience from graduate students to researchers in physics, materials science, and electrical engineering who work on optoelectronic devices, renewable energies, or in the semiconductor industry.
Author : Shujing Wang
Publisher :
ISBN 13 :
Total Pages : 262 pages
Book Rating : 4.:/5 (69 download)
Download or read book Ultrafast Spectroscopy of Single-chirality Single-walled Carbon Nanotubes written by Shujing Wang and published by . This book was released on 2010 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Single-walled carbon nanotubes (SWNTs) are quasi-one-dimensional nanomaterials. There are a variety of SWNT structures defined by different diameter and chirality. The most recent progress in obtaining single-chirality enriched SWNT samples by using specific DNA sequences as the dispersing agent have promoted the fundamental study and practical application of nanotubes with identical structure. Femtosecond pump-probe transient absorption spectroscopy was performed to study the electronic and optical properties of single-chirality SWNTs. At the early decay time window (
Author : Tam Q. Nhan
Publisher :
ISBN 13 :
Total Pages : 276 pages
Book Rating : 4.:/5 (263 download)
Download or read book Ultrafast Dynamics of Individual Air-suspended Single-walled Carbon Nanotube written by Tam Q. Nhan and published by . This book was released on 2008 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thorough understanding of the electronic and optical properties of single-walled carbon nanotubes (SWCNTs) will no doubt benefit future technological applications. Since the discovery of band gap photoluminescence from isolated semiconducting SWCNTs, significant progresses in studying the optical properties of SWCNTs have been made (e.g. linear polarization along the tube axis for the absorption and emission of light, excitonic nature in SWCNT excitation). However, there are still several controversial parameters of SWCNTs (e.g. quantum efficiency, absorption cross section, radiative lifetime, and Auger recombination lifetime). With the advancement in SWCNT sample preparation, studies of SWCNT intrinsic properties have shifted from ensemble to a single tube level, in which the ambiguities in elucidating intrinsic properties posed by the assortment of different tube species can be minimized. By examining individual SWCNTs suspended in air, in contrast to micelle-encapsulated SWCNTs, we believe that the environmental effects can be reduced. This thesis will demonstrate the capability of doing spectroscopy on a single semiconducting air-suspended SWCNT. In continuous-wave excitation, the photoluminescence excitation map and high resolution photoluminescence (PL) image of a SWCNT can be constructed, and PL polarization is proven. Quantum efficiency of 5% is experimentally estimated for (9,8) and (10,8) chiral SWCNTs. Pulse excitation allows us to study the intrinsic exciton dynamics of a SWCNT. To gain insight into exciton nonlinear decay processes, PL saturation in pump power dependence measurement is investigated and compared to the simulated results from stochastic models of exciton dynamics. Femtosecond excitation correlation spectroscopy with 150 fs time resolution is employed to time-resolve the PL of a single tube suspended in air.
Author : K.K. Chow
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128088257
Total Pages : 27 pages
Book Rating : 4.1/5 (28 download)
Download or read book Carbon nanotubes and graphene for photonic applications written by K.K. Chow and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of their estimated ultra-high third-order nonlinearity, single-walled carbon nanotubes (CNTs) can be regarded as a potential new material for optical nonlinearity. The nonlinearity of CNTs is believed to originate from the inter-band transitions of the π-electrons, causing nonlinear polarization. In this respect, CNTs are similar to other organic optical materials that exhibit extremely high nonlinearity. CNT-based photonics devices offer several key advantages, including ultrafast response, robustness, tunability of wavelength, and compatibility to fibers. This chapter will describe the design and fabrication of CNT-based nonlinear photonic devices. CNTs with suitable diameters – and thus suitable operational wavelengths – are deposited or grown directly on different types of fibers or waveguides to ensure effective CNT–light interaction. Optical nonlinear effects including four-wave mixing (FWM), cross-phase modulation (XPM), and self-phase modulation (SPM) have been observed experimentally using fabricated CNT-based devices. Corresponding wavelength conversion and optical signal regeneration applications based on various nonlinear effects are discussed.
Author : W.B. Cho
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128088230
Total Pages : 35 pages
Book Rating : 4.1/5 (28 download)
Download or read book Carbon nanotubes and graphene for photonic applications written by W.B. Cho and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-walled carbon nanotubes (SWCNTs) possessing outstanding linear and nonlinear optical properties are utilized as saturable absorbers (SAs) for passive mode-locking of different bulk solid-state lasers in a wide spectral range between 0.8 and 2μm. To overcome some of the limitations and drawbacks of currently available saturable absorbers, diverse carbon nanotubes and techniques for fabrication of single-walled carbon nanotube saturable absorbers (SWCNT-SAs) are investigated. In this chapter, we discuss various manufacturing procedures and essential characteristics of SWCNT-based passive mode-locking devices, and review recent demonstrations of passively mode-locked solid-state lasers employing different types of SWCNT-SAs.
Author : Arkadi Chipouline
Publisher : Springer
ISBN 13 : 3319775200
Total Pages : 324 pages
Book Rating : 4.3/5 (197 download)
Download or read book Optical Metamaterials: Qualitative Models written by Arkadi Chipouline and published by Springer. This book was released on 2018-12-28 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook bridges the gap between university courses on electrodynamics and the knowledge needed to successfully address the problem of electrodynamics of metamaterials. It appeals to both experimentalists and theoreticians who are interested in the physical basics of metamaterials and plasmonics. Focusing on qualitative fundamental treatment as opposed to quantitative numerical treatment, it covers the phenomena of artificial magnetization at high frequencies, and discusses homogenization procedures and the basics of quantum dynamics in detail. By considering different phenomena it creates a self-consistent qualitative picture to explain most observable phenomena. This allows readers to develop a better understanding of the concepts, and helps to create a conceptual approach, which is especially important in educational contexts. This clearly written book includes problems and solutions for each chapter, which can be used for seminars and homework, as well as qualitative models that are helpful to students.
Author : Y.-W. Song
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128088206
Total Pages : 53 pages
Book Rating : 4.1/5 (28 download)
Download or read book Carbon nanotubes and graphene for photonic applications written by Y.-W. Song and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: With their nano-scaled dimensions and extremely elevated optical nonlinearity, carbon nanostructures including single-walled carbon nanotubes and graphene have played a critical role in generating ultrafast optical pulses. The pulsation relies on passive mode-locking of the nanostructures, and has been enhanced by employing an evanescent field interaction scheme that guarantees the all-fiber high-power operation. Preparation schemes for pulsating devices have been evolving via the development of elegant processes such as optical deposition, electrospray, and aerosol deposition of carbon nanostructures, ensuring the dramatic increase of process efficiency. In this chapter, details of the technical achievements are addressed.
Author : Paul Corkum
Publisher : Springer Science & Business Media
ISBN 13 : 3540687793
Total Pages : 853 pages
Book Rating : 4.5/5 (46 download)
Download or read book Ultrafast Phenomena XV written by Paul Corkum and published by Springer Science & Business Media. This book was released on 2007-07-10 with total page 853 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a collection of papers presented at the Fifteenth International Conference on Ultrafast Phenomena held at the Asilomar Conference Grounds, Pacifc Grove, CA, USA, from July 31 – August 4, 2006. The Ultrafast P- nomena conferences are held every two years and provide a forum for disc- sion of the latest results in ultrafast optics and their applications in science and engineering. These meetings bring together researchers spanning several felds of science and engineering to discuss and debate the latest advances in ult- fast science. This unique forum provides a conduit for the greater dissemi- tion of the latest advances using ultrashort coherent pulses of light. More than 280 papers were presented. Signifcant progress in creating ever shorter pulses of light was reported in the attosecond range, with new applications in high harmonic generation and frequency comb metrology. Multidimensional sp- troscopy is rapidly evolving to provide new insights into quantum coherence and interactions in complex systems. Improvements in time resolved electron and x-ray diffraction provide better atomic scale perspectives on structural dynamics. These examples are but a small subset of the collected works ga- ered in this volume, which provides a valuable synopsis of the recent advances and impact of ultrafast technology in illuminating fundamental processes in physics, chemistry, and biology. There were 323 attendees at the meeting, more than one third of which were graduate and postdoctoral students. Increased s- dent attendance energized the proceedings.
Author : Zeev Valy Vardeny
Publisher : CRC Press
ISBN 13 : 142007282X
Total Pages : 324 pages
Book Rating : 4.4/5 (2 download)
Download or read book Ultrafast Dynamics and Laser Action of Organic Semiconductors written by Zeev Valy Vardeny and published by CRC Press. This book was released on 2009-01-21 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spurred on by extensive research in recent years, organic semiconductors are now used in an array of areas, such as organic light emitting diodes (OLEDs), photovoltaics, and other optoelectronics. In all of these novel applications, the photoexcitations in organic semiconductors play a vital role. Exploring the early stages of photoexcitations that
Author : Shinji Yamashita
Publisher : Elsevier
ISBN 13 : 0857098624
Total Pages : 440 pages
Book Rating : 4.8/5 (57 download)
Download or read book Carbon Nanotubes and Graphene for Photonic Applications written by Shinji Yamashita and published by Elsevier. This book was released on 2013-08-31 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: The optical properties of carbon nanotubes and graphene make them potentially suitable for a variety of photonic applications. Carbon nanotubes and graphene for photonic applications explores the properties of these exciting materials and their use across a variety of applications.Part one introduces the fundamental optical properties of carbon nanotubes and graphene before exploring how carbon nanotubes and graphene are synthesised. A further chapter focusses on nonlinearity enhancement and novel preparation approaches for carbon nanotube and graphene photonic devices. Chapters in part two discuss carbon nanotubes and graphene for laser applications and highlight optical gain and lasing in carbon nanotubes, carbon nanotube and graphene-based fiber lasers, carbon-nanotube-based bulk solid-state lasers, electromagnetic nonlinearities in graphene, and carbon nanotube-based nonlinear photonic devices. Finally, part three focusses on carbon-based optoelectronics and includes chapters on carbon nanotube solar cells, a carbon nanotube-based optical platform for biomolecular detection, hybrid carbon nanotube-liquid crystal nanophotonic devices, and quantum light sources based on individual carbon nanotubes.Carbon nanotubes and graphene for photonic applications is a technical resource for materials scientists, electrical engineers working in the photonics and optoelectronics industry and academics and researchers interested in the field. Covers the properties and fabrication of carbon nanotubes and graphene for photonic applications Considers the uses of carbon nanotubes and graphene for laser applications Explores numerous carbon-based light emitters and detectors
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (967 download)
Download or read book Terahertz Spectroscopy of Low-Dimensional Nanomaterials written by and published by . This book was released on 2016 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear and non-equilibrium properties of low-dimensional quantum materials are fundamental in nanoscale science yet transformative in nonlinear imaging/photonic technology today. These have been poorly addressed in many nano-materials despite of their well-established equilibrium optical and transport properties. The development of ultrafast terahertz (THz) sources and nonlinear spectroscopy tools facilitates understanding these issues and reveals a wide range of novel nonlinear and quantum phenomena that are not expected in bulk solids or atoms. In this paper, we discuss our recent discoveries in two model photonic and electronic nanostructures to solve two outstanding questions: (1) how to create nonlinear broadband terahertz emitters using deeply subwavelength nanoscale meta-atom resonators? (2) How to access one-dimensional (1D) dark excitons and their non-equilibrium correlated states in single-walled carbon nanotubes (SWMTs)?
Author : Takayoshi Kobayashi
Publisher : CRC Press
ISBN 13 : 0429589786
Total Pages : 1255 pages
Book Rating : 4.4/5 (295 download)
Download or read book Ultrashort Pulse Lasers and Ultrafast Phenomena written by Takayoshi Kobayashi and published by CRC Press. This book was released on 2023-03-21 with total page 1255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the basic physical principles of techniques to generate and ultrashort pulse lasers and applications to ultrafast spectroscopy of various materials covering chemical molecular compounds, solid-state materials, exotic novel materials including topological materials, biological molecules and bio- and synthetic polymers. It introduces non-linear optics which provides the basics of generation and measurement of pulses and application examples of ultrafast spectroscopy to solid state physics. Also it provide not only material properties but also material processing procedures. The book describes also details of the world shortest visible laser and DUV lasers developed by the author’s group. It is composed of the following 12 Sections: The special features of this book is that it is written by a single author with a few collaborators in a systematic way. Hence it provides a comprehensive and systematic description of the research field of ultrashort pulse lasers and ultrafast spectroscopy. Generation of ultrashort pulses in deep ultraviolet to near infrared Generation of ultrashort pulses in terahertz Carrier envelope phase (CEP) Simple NLO processes with a few colors Multi-color involved NLO processes Multi-color ultrashort pulse generation NLO materials NLO processes in time-resolved spectroscopy Low dimension materials Conductors and superconductors Chemical reactions and material processing Photobiological reactions
Author : Rashid A. Ganeev
Publisher : Elsevier
ISBN 13 : 0128143045
Total Pages : 434 pages
Book Rating : 4.1/5 (281 download)
Download or read book Nanostructured Nonlinear Optical Materials written by Rashid A. Ganeev and published by Elsevier. This book was released on 2018-06-29 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured Nonlinear Optical Materials: Formation and Fabrication covers the analysis of the formation, characterization and optical nonlinearities of various nanostructures using different methods. It addresses many areas of research in the field, including the modification of the surfaces of materials for the formation of various nanostructures, transmission electron microscopy and time-of-flight mass spectroscopy studies of ablated bulk and nanoparticle targets, the low-order nonlinearities of metal and semiconductor nanoparticles, the nonlinear refraction and nonlinear absorption of carbon-contained nanoparticles, and low- and high-order harmonic generation in nanoparticle-contained plasmas, amongst other topics. The book is an essential reference for all nanomaterials researchers in the fields of photonics, materials, physics, chemistry and nanotechnology. Present complete coverage of the formation, characterization and optical nonlinearities of nanostructures Builds on basic theory, showing the strengths of the application of nanostructures in optical materials Written by a leading expert in the subject
