April 13, 2021

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Tip Enhancement

Tip Enhancement
Author : Anonim
Publisher : Elsevier
Release Date : 2011-09-22
Category : Science
Total pages :338
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This book discusses the recent advances in the area of near-field Raman scattering, mainly focusing on tip-enhanced and surface-enhanced Raman scattering. Some of the key features covered here are the optical structuring and manipulations, single molecule sensitivity, analysis of single-walled carbon nanotubes, and analytic applications in chemistry, biology and material sciences. This book also discusses the plasmonic materials for better enhancement, and optical antennas. Further, near-field microscopy based on second harmonic generation is also discussed. Chapters have been written by some of the leading scientists in this field, who present some of their recent work in this field. ·Near-field Raman scattering ·Tip-enhanced Raman spectroscopy ·Surface-enhanced Raman spectroscopy ·Nano-photonics ·Nanoanalysis of Physical, chemical and biological materials beyond the diffraction limits ·Single molecule detection

Tip-Enhanced Raman Spectroscopy for Nanoelectronics

Tip-Enhanced Raman Spectroscopy for Nanoelectronics
Author : Mischa Nicklaus
Publisher : BoD – Books on Demand
Release Date : 2014-04-22
Category : Science
Total pages :152
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This dissertation focuses on the application of Tip-Enhanced Raman spectroscopy (TERS) to non-transparent and non-conductive samples, allowing for the optical characterization of nanoelectronic devices. As such, nano-crystals are analyzed as a model system for the investigation of chemical and structural properties. Furthermore, a novel method for mapping the refractive index of materials with nanometer resolution is presented. The technological progress of electronics through miniaturization has reached the nanoscale while new materials with high performance and functional properties gain importance. Quality control and the scientific understanding of size effects in electronic nanostructures are required more than ever to consolidate existing technologies and to determine scaling limits of new materials. Conventional techniques, including scanning electron and scanning probe microscopy, provide topographic information but only very limited chemical information to analyze the physical properties of nanomaterials. Chemical and structural sensitivity is available by Raman or infrared spectroscopy, but with a spatial resolution limited to the microscale by the diffraction limit of light. TERS combines the virtues of scanning probe microscopy with those of optical spectroscopy to overcome the diffraction limit through the excitation of surface plasmons on a scanning probe tip to confine light to nanometers. In this work, a TERS system was installed to operate on opaque samples by employing optical side access. TERS probes were fabricated by electrochemical etching and operated in scanning tunneling microscopy and atomic force microscopy with quartz tuning forks to enable scanning on various surfaces. TERS was then applied to ferroelectric lead titanate nano-crystals on a platinized silicon substrate as a model system for nanostructured, charge-based memory devices at the onset of finite size effects.

Oxford Handbook of Nanoscience and Technology

Oxford Handbook of Nanoscience and Technology
Author : A.V. Narlikar,Y.Y. Fu
Publisher : Oxford University Press
Release Date : 2010-02-11
Category : Science
Total pages :960
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These three volumes are intended to shape the field of nanoscience and technology and will serve as an essential point of reference for cutting-edge research in the field.

Nanoscale Spectroscopy with Applications

Nanoscale Spectroscopy with Applications
Author : Sarhan M. Musa
Publisher : CRC Press
Release Date : 2013-11-04
Category : Science
Total pages :578
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This book introduces the key concepts of nanoscale spectroscopy methods used in nanotechnologies in a manner that is easily digestible for a beginner in the field. It discusses future applications of nanotechnologies in technical industries. It also covers new developments and interdisciplinary research in engineering, science, and medicine. An overview of nanoscale spectroscopy for nanotechnologies, the book describes the technologies with an emphasis on how they work and on their key benefits. It also serves as a reference for veterans in the field.

Enhanced Planning Review of the Honolulu, HI Metropolitan Area

Enhanced Planning Review of the Honolulu, HI Metropolitan Area
Author : John A. Volpe National Transportation Systems Center (U.S.)
Publisher : Unknown
Release Date : 1996
Category : Transportation
Total pages :40
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The FTA and FHWA have initiated a series of joint Enhanced Planning Reviews (EPRs) to assess the impact of the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) on the planning processes conducted by the transportation agencies serving metropolitan areas. The ERPs are also intended to determine the effects of planning on transportation investment processes. The ERP for Honolulu included a federal site visit from January 9 through January 12, 1995. At the conclusion of the site visit, the team presented preliminary observations and recommendations to the local agencies taking part of the review. The team formulated several additional observations as a result of the further review of documents and notes. This report presents the summary conclusion and a complete set of the observations and recommendations.

Enhanced Planning Review of the Dallas-Fort Worth Metropolitan Area

Enhanced Planning Review of the Dallas-Fort Worth Metropolitan Area
Author : Robert Brodesky,John A. Volpe National Transportation Systems Center (U.S.)
Publisher : Unknown
Release Date : 1996
Category : Transportation
Total pages :40
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Text of "A" Papers from the ... Meeting

Text of
Author : IEEE Power Engineering Society
Publisher : Unknown
Release Date : 1977
Category : Electric power
Total pages :129
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"Contains the full text of all the papers published in abstract "A" form in PA&S."

Surface Enhanced Raman Spectroscopy

Surface Enhanced Raman Spectroscopy
Author : Anonim
Publisher : Unknown
Release Date : 2006
Category : Raman effect, Surface enhanced
Total pages :338
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Multiphoton Microscopy in the Biomedical Sciences

Multiphoton Microscopy in the Biomedical Sciences
Author : Anonim
Publisher : Unknown
Release Date : 2005
Category : Fluorescence microscopy
Total pages :129
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Philosophical Transactions

Philosophical Transactions
Author : Anonim
Publisher : Unknown
Release Date : 2003
Category : Engineering
Total pages :129
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Journal of the Optical Society of America

Journal of the Optical Society of America
Author : Anonim
Publisher : Unknown
Release Date : 2003
Category : Imaging systems
Total pages :129
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Understanding the Nervous System

Understanding the Nervous System
Author : Sid Deutsch,Alice Deutsch
Publisher : Wiley-IEEE Press
Release Date : 1993-01-22
Category : Technology & Engineering
Total pages :394
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Of great value to the biomedical engineer as well as any reader curious about the subject, this volume describes the workings of the human nervous system as seen through the eyes of an engineer. With a broad scope and a readable level, it provides a fascinating alternative to the unwieldly sources written by life scientists.

Interpreting High-Resolution Tip-Enhanced Raman Spectroscopy Images

Interpreting High-Resolution Tip-Enhanced Raman Spectroscopy Images
Author : Pengchong Liu
Publisher : Unknown
Release Date : 2020
Category :
Total pages :129
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Raman spectroscopy is one of the fundamental techniques in chemical characterization. It measures the amount of photons and their frequency shifts scattered by the molecule under a given laser beam. The frequency shifts originate from the molecule's vibrations, which are determined by its microscopic structure. Thus, a Raman spectrum is often regarded as the molecule's "fingerprint". When the molecule is placed on a noble metal surface with some curvature, the Raman signals are greatly enhanced by the plasmonic near field at the surface. This technique is called "surface- enhanced Raman spectroscopy", or SERS. Because of the significantly improved sensitivity relative to regular Raman scattering, SERS has grown into a widely popular tool for chemical research and practical applications. Moreover, the molecule-metal interaction that lies in the center of the mechanism of SERS has been a hot topic of fundamental research since its discovery and has led to many variants in the development of spectroscopic techniques. Tip-enhanced Raman spectroscopy (TERS) integrates the scanning probe microscopy and SERS. Similar to SERS, the enhancement of Raman scattering in TERS benefits from the inhomogeneous near field induced by the plasmonic resonance of the noble metal nanostructure. However, the TERS spectrum of a molecule is often found different than SERS, and it changes with the tip position. The combination of the chemical sensitivity and the spatial resolution makes TERS a promising technique for microscopic characterization. A comprehensive demonstration of these unique features is TERS imaging. A TERS image is a two-dimensional map of the Raman intensity at a certain frequency varying with the scanning tip. It exhibits a sub-nanometer resolution and is specific to the corresponding vibrational mode. TERS imaging is considered as a visualization of molecular vibrations and sets stage for a new way of understanding molecules. Therefore, it is necessary to develop theoretical interpretation of TERS images and their connections to the underlying molecular vibration. However, interpreting TERS images is challenging as the brightspot pattern does not always strictly align with the vibrating atoms and the signals are very sensitive to experimental conditions. In this dissertation, three major aspects of TERS theory are explored: the effect of the plasmonic near field electromagnetic mechanism), the plasmonic resonance inside a subnanometer cavity (gap plasmonics), and the quantum mechanical interactions between the molecule and the substrate (the chemical mechanism). In particular, the critical conditions of the near field to achieve atomic resolution are found. It is also illustrated that the locally integrated Raman polarizability density is the sub-molecular property probed by the confined near field in TERS. It provides an intuitive description of the TERS imaging mechanism, which is usually hidden in the self-consistent cycles of conventional calculations using the time-dependent density functional theory. The distinct feature of TERS is largely ascribed to the unique plasmonic properties of a sub-nanometer junction consisting of a flat metal substrate and an atomically sharp tip. At this length scale, atomistic electrodynamics is adopted to describe the nanostructure because it captures the microscopic structure and at the same time retains the efficiency of a classical model.To study the charge-transfer plasmon due to quantum tunneling, a Hirshfeld partitioning scheme is developed to distinguish the plasmonic resonances within and across the coupled nanoparticles. Furthermore, this dissertation presents the development of a new theoretical method to better describe the substrate-molecule coupling, namely, exact frozen density embedding. The method to obtain the response properties of a molecule is derived based on the exact frozen density embedding within the framework of time-dependent density functional theory. Finally, a polarizable frozen density embedding method is developed to include the polarization effect due to the presence of a metal nanoparticle. The development of these theoretical tools is potentially applicable to the studies of the electronic structures of a TERS system.

Nanobiophotonics and Biomedical Applications

Nanobiophotonics and Biomedical Applications
Author : Anonim
Publisher : Unknown
Release Date : 2004
Category : Biophotometry
Total pages :129
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