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1. Nonlinear resonant acoustic detection of cracks in multilayer ceramic capacitors
Published: 9/3/2014
Authors: Ward L Johnson, Sudook A. Kim, Grady S White, Jaemi Herzberger
Abstract: Abstract,Measurements of resonant ultrasonic frequencies of multilayer ceramic capacitors (MLCC) were performed as a function of excitation amplitude to assess the potential of nonlinear acoustic methods for sensing the presence of cracks. The ultima ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917065

2. Nonlinear acoustic effects in multilayer ceramic capacitors
Published: 1/25/2013
Authors: Ward L Johnson, Sudook A. Kim, Timothy P Quinn, Grady S White
Abstract: Nonlinear resonant acoustics was explored as an approach for nondestructively evaluating the susceptibility of BaTiO3-based multilayer ceramic capacitors to electrical failure during service. The acoustic nonlinearity was characterized through measu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912482

3. Vibrational modes of GaN nanowires in the gigahertz range
Published: 11/13/2012
Authors: Ward L Johnson, Sudook A. Kim, Roy H. Geiss, Colm Flannery, Kristine A Bertness, Paul R Heyliger
Abstract: Monocrystalline nanowires offer an attractive basis for resonant nanoelectromechanical systems (NEMS) for a variety of applications, including mass and force sensing, and, in each of these applications, there are advantages to operation at frequenci ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911204

4. Contributions to anelasticity in langasite and langatate
Published: 12/30/2011
Authors: Ward L Johnson, Sudook A. Kim, Christine F. Rivenbark, Satoshi Uda
Abstract: Maximization of the quality factors Q of langasite (LGS) and langatate (LGT) is necessary for optimal performance of acoustic resonators of these materials in frequency-control and high-temperature sensing applications. In this report, measurements ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908350

5. Ultrasonic Detection of Defects in Multilayered Ceramic Capacitors for Active Implantable Medical Devices
Published: 8/8/2011
Authors: Sudook A. Kim, Ward L Johnson, Grady S White, Roger Roberts
Abstract: Resonant ultrasound spectroscopy (RUS) was used to measure the acoustic frequencies of surface-mountable X7R multilayered ceramic capacitors (MLCC), with the aim of determining whether RUS can serve as a nondestructive method for detecting structural ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909481

6. Effects of shape distortions and imperfections on mode frequencies and collective linewidths in nanomagnets
Published: 3/28/2011
Authors: Hans Toya Nembach, Justin M Shaw, Thomas J Silva, Ward L Johnson, Sudook A. Kim, Robert D McMichael, Pavel Kabos
Abstract: We used Brillouin light scattering to show that shape distortions in Ni80Fe20 nanoelements can have a dramatic effect on the measured linewidth of certain modes. By intentionally introducing an amount of ,egg-likeŠ shape distortion to an ideal ellip ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907044

7. From the bottom up ‹ measuring bulk mechanical properties via microtechnology
Published: 6/10/2010
Authors: Nicholas Barbosa, Sudook A. Kim, David Thomas Read
Abstract: The micromechanics community has developed a large set of tools for measuring the properties of micro- and nano-scaled materials. These new tools have been successfully applied to a range of materials, most often in thin-film form, to determine the c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904137

8. Elastic constants and dimensions of imprinted polymeric nanolines determined from Brillouin light scattering
Published: 1/18/2010
Authors: Ward L Johnson, Sudook A. Kim, Roy H. Geiss, Colm Flannery, Paul R Heyliger, Christopher L Soles, Wen-Li Wu, Chengqing C. Wang, Christopher M Stafford, B D. Vogt
Abstract: Elastic constants and cross-sectional dimensions of imprinted nanolines of poly(methyl methacrylate) (PMMA) on silicon are determined nondestructively from finite-element inversion analysis of dispersion curves of hypersonic acoustic modes of these ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903959

9. Optimization of arrays of gold nanodisks for plasmon-mediated Brillouin light scattering
Published: 7/22/2009
Authors: Ward L Johnson, Sudook A. Kim, Zhandos Utegulov, B. T. Draine
Abstract: Distributions of electric fields in two-dimensional arrays of gold nanodisks on a Si3N4 membrane, with light incident through the membrane, are modeled with the aim of determining array geometries for effective plasmon-mediated Brillouin light scat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854474

10. Surface-plasmon-enhanced electric fields in two-dimensional arrays of gold nanodisks
Published: 8/4/2008
Authors: Ward L Johnson, Sudook A. Kim, Zhandos Utegulov, B. T. Draine
Abstract: Electric-field distributions in two-dimensional arrays of gold nanodisks on Si3N4 membranes are modeled, using the discrete-dipole approximation, as a function of nanodisk diameter (20 − 50 nm), height (10 − 100 nm), ratio of the array sp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854107



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