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Search Publications by: John T. Woodward IV (Fed)

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Displaying 26 - 50 of 61

Absolute Flux Calibration of Stars; Calibration of the Reference Telescope

June 2, 2009
Author(s)
Allan W. Smith, John T. Woodward IV, Colleen A. Jenkins, Steven W. Brown, Keith R. Lykke
Absolute stellar photometry is based on 1970s terrestrial measurements of the star Vega with instruments calibrated using the Planckian radiance from a Cu fixed-point blackbody. Significant advances in absolute radiometry have been made in the last 30

Supercontinuum Sources for Metrology

June 2, 2009
Author(s)
John T. Woodward IV, Allan W. Smith, Colleen A. Jenkins, Chungsan Lin, Steven W. Brown, Keith R. Lykke
Supercontinuum (SC) sources are novel laser-based sources that generate a broad, white-light continuum in single mode photonic crystal fibers. Currently, up to 6 W of optical power is available, spanning the spectral range from 460 nm to 2500 nm. Advances

Surface Applications of Cavity Ring-Down Spectroscopy

October 16, 2008
Author(s)
A C. Pipino, Curtis Meuse, J P. Hoefnagels, Vitalii I. Silin, John T. Woodward IV
We report preliminary results describing two new applications of cavity ring-down spectroscopy (CRDS): 1) detection of non-absorbing species by refractive-index change using surface-plasmon-resonance (SPR)-enhanced CRDS, and 2) C-H overtone detection by

Characterization of the Latent Image to Developed Image in Model EUV Photoresists

February 22, 2008
Author(s)
John T. Woodward IV, Kwang-Woo Choi, Vivek Prabhu, Shuhui Kang, Kristopher Lavery, Wen-Li Wu, Michael Leeson, Anuja De Silva, Nelson Felix, Christopher K. Ober
Current extreme ultraviolet (EUV) photoresist materials do not yet meet exposure-dose sensitivity, line-width roughness, and resolution requirements. In order to quantify how trade-offs are related to the materials properties of the resist and processing

Component Segregation in Model Chemically Amplified Resists

March 15, 2007
Author(s)
John T. Woodward IV, Theodore Fedynyshyn, David Astolfi, Susan Cann, Michael Leeson
We have applied chemical force microscopy (CFM) to probe the chemical segregation of resist materials. CFM is capable of providing simultaneous information about surface topography and chemical heterogeneity of partiallt developed resist films. We have

Effect of Photoacid Generator Concentration and Developer Strength on the Patterning Capabilities of a Model EUV Photoresist

February 25, 2007
Author(s)
Kwang-Woo Choi, Vivek Prabhu, Kristopher Lavery, Eric K. Lin, Wen-Li Wu, John T. Woodward IV, Michael Leeson, H Cao, Manish Chandhok, George Thompson
Current extreme ultraviolet (EUV) photoresist materials do not yet meet requirements on exposure-dose sensitivity, line-width roughness (LWR), and resolution. Fundamental studies are required to quantify the trade-offs in materials properties and

Surface-Plasmon-Resonance-Enhanced Cavity Ring-Down Detection

January 1, 2004
Author(s)
A C. Pipino, John T. Woodward IV, Curtis W. Meuse, Vitalii I. Silin
The cavity ring-down technique is used to probe the absolute optical response of the localized surface plasmon resonance (SPR) of a gold nanoparticle distribution to adsorption of trichloroethylene (TCE) and perchloroethylene (PCE) from the gas phase

Osteoblast Cell Membrane Hybrid Bilayers for Studying Cell-Cell Interactions

September 30, 2003
Author(s)
John T. Elliott, Alessandro Tona, John T. Woodward IV, Curtis W. Meuse, H M. Elgendy, Anne L. Plant
Osteopath-like cells were grown on a surface that presents cell membrane components to the cells in culture. The culture surface was a bilayer formed by the interaction of osteoblast plasma membrane vesicles with an alkanethiol monolayer. We examined the

Biomimetic Membranes on Metal Supports

May 1, 2003
Author(s)
John T. Elliott, Curtis W. Meuse, Vitalii I. Silin, Susan T. Krueger, John T. Woodward IV, T Petralli-Mallow, Anne L. Plant
Biological membranes are complex and dynamic structures. The biological functions associated with membranes involve a number of different molecular species, and theories of how the molecular species are organized are still evolving. The fluid mosaic model

Choosing a Cantilever for In Situ Atomic Force Microscopy

April 1, 2003
Author(s)
John T. Woodward IV
This manuscript is a non-peer reviewed, invited tutorial for Microscopy Today. It describes the issues involved in choosing a cantilever for atomic force microscope (AFM) imaging under fluids. In situ AFM imaging is an increasingly popular technique for

Isostructural Self-Assembled Monolayers, Part 1. Octadecyl 1-thiaoligo(ethylene oxides)

April 1, 2003
Author(s)
David J. Vanderah, Richard S. Gates, Vitalii I. Silin, D N. Zeiger, John T. Woodward IV, Curtis W. Meuse, Gintaras Valincius, B Nickel
The self-assembled monolayers (SAMs) of a series of octadecyl 1-thiaoligo(ethylene oxide)x disulfides {[S(CH 2CH 2O) xC 18H 37] 2}, where x = 4 to 8, were assembled on gold and characterized by reflection-adsorption infrared spectroscopy (RAIRS)

Thin Films of Collagen Affect Smooth Muscle Cell Morphology

March 4, 2003
Author(s)
John T. Elliott, Alessandro Tona, John T. Woodward IV, P L. Jones, Anne L. Plant
The purpose of this study was to provide a reproducible method for applying collagen to surfaces on which cells can be grown, and to characterize the resulting thin films of collagen protein with respect to molecular structure and cellular response