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Displaying 751 - 775 of 1598

Structure and Dynamics of Bimodal Colloidal Dispersions in a Low-Molecular Weight Polymer Solution

February 24, 2017

Author(s)

Fan Zhang, Andrew J. Allen, Lyle E. Levine, De-Hao Tsai, Jan Ilavsky

We present an experimental study of the structural and dynamical properties of bimodal, micrometer-sized colloidal dispersions (size ratio ≈ 2) in an aqueous solution of low-molecular weight polymer (polyethylene glycol 2000) using synchrotron ultra-small

Enabling photoemission electron microscopy in liquids via graphene-capped microchannel arrays

February 8, 2017

Author(s)

Hongxuan Guo, Evgheni Strelcov, Alexander Yulaev, Jian Wang, Narayana Appathurai, Stephen Urquhart, John Vinson, Subin Sahu, Michael P. Zwolak, Andrei Kolmakov

Photoelectron emission microscopy (PEEM) is a powerful tool to spectroscopically access dynamic surface processes at the nanoscale but is traditionally limited to ultra-high or moderate vacuum conditions. Here, we develop a novel graphene-capped

Optical probe for nondestructive wafer-scale characterization of photonic elements

January 27, 2017

Author(s)

Thomas Michels, Vladimir A. Aksyuk

This article describes fabrication and operation of a microfabricated photonic waveguide loop probe for nondestructive evanescent coupling and localized testing of nanophotonic devices and circuits. A microfabricated 300 nm x 260 nm silicon (Si) waveguide

Static and Time-Resolved Terahertz Measurements of Photoconductivity in Solution-Deposited Ruthenium Oxide Nanofilms

January 25, 2017

Author(s)

Brian Alberding, Paul A. Desario, Adam D. Dunkelberger, Debra R. Rolison, Jeffrey C. Owrutsky, Edwin J. Heilweil

Thin film Ruthenium Oxide (RuO2) is a promising alternative material as a conductive electrode in electronic applications because its rutile crystalline form is metallic and highly conductive. Herein, a previously established solution-deposition multi

Direct Measurement of Dissipation in Phononic Crystal and Straight Tethers for MEMS Resonators

January 21, 2017

Author(s)

Vikrant J. Gokhale, Jason J. Gorman

This paper presents optical measurements of the dynamic strain profiles along the tethers of microelectromechanical resonators and relates them to quality factor. Such measurements allow for the quantification of tether dissipation and fair comparison

Dual Frequency Comb Laser Absorption Spectroscopy in a 16 MW Gas Turbine Exhaust

January 1, 2017

Author(s)

Paul J. Schroeder, Robert J. Wright, Sean Coburn, Bennett Sodergren, Kevin C. Cossel, Stefan Droste, Gar W. Truong, Esther Baumann, Fabrizio R. Giorgetta, Ian R. Coddington, Nathan R. Newbury, Gregory B. Rieker

Spectral dependence of carrier lifetimes in silicon for photovoltaic applications

December 21, 2016

Author(s)

John F. Roller, Yu-Tai Li, Mario Dagenais, Behrang H. Hamadani

Charge carrier lifetimes in photovoltaic-grade silicon wafers were measured by a spectral-dependent, quasi-steady-state photoconductance technique. Narrow bandwidth LEDs were used to excite excess charge carriers within the material, and the effective

Decoupling of a Neutron Interferometer from Temperature Gradients

December 16, 2016

Author(s)

Michael G. Huber, Muhammad D. Arif, P. Saggu, T. Mineeva, David Cory, Robert Haun, Ben Heacock, K Li, J. Nsofini, D. Sarenac, Chandra Shahi, V Skavysh, Mike Snow, S. Werner, A.R. Young, Dmitry Pushin

Neutron interferometry enables precision measurements that are typically operated within elaborate, multi-layered facilities which provide substantial shielding from environmental noise. These facilities are necessary to maintain the coherence requirements

Fabrication Process for an Optomechanical Transducer Platform with Integrated Actuation

December 8, 2016

Author(s)

Thomas Michels, Ivo Rangelow, Vladimir Aksyuk

This article reports a process for batch fabrication of a fiber pigtailed optomechanical transducer platform with overhanging cantilevers. The process combines nanophotonic, mechanical, and electrical elements with a combination of surface and bulk

A method for characterizing model fidelity in laser powder bed fusion additive manufacturing

November 30, 2016

Author(s)

Ibrahim Assouroko, Paul Witherell, Felipe LOPEZ

As Additive Manufacturing (AM) matures as a technology, predictive modeling methods have become increasingly sought after as a means for process planning, monitoring and control. For many, predictive modeling offers the potential to complement, and in some

Contact electrification of individual dielectric microparticles measured by optical tweezers in air.

November 29, 2016

Author(s)

Haesung Park, Thomas W. LeBrun

We have measured the charging of a dielectric microparticle after interacting with a glass substrate using optical tweezers to control the particle, measure its charge with sensitivity of a few electrons and precisely position the particle on the substrate

Optical amplitude and Phase Modulation Dynamics at the Single Photon Level in a Quantum Dot Ridge Waveguide

November 17, 2016

Author(s)

Galan A. Moody, Corey A. McDonald, Ari D. Feldman, Todd E. Harvey, Richard P. Mirin, Kevin L. Silverman

The amplitude and phase of a materials nonlinear optical response provide insight into the underlying electronic and exciton dynamics that determine its optical properties. Phase-sensitive nonlinear spectroscopy techniques are widely implemented to

A Planar Hyperblack Absolute Radiometer

November 14, 2016

Author(s)

John H. Lehman, Michelle S. Stephens, Malcolm G. White, Andreas Steiger, Christian Monte, Joerg Hollandt, Ivan Ryger, Mathias Kehrt, Marla L. Dowell

The absolute responsivity of a planar radiometer fabricated from micromachined silicon and having carbon nanotubes as the absorber and thermistor was measured in the visible and far infrared (free-field terahertz) wavelength range by means of detector

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