Dr. Kenneth Evans-Lutterodt Profile

Dr. Kenneth Evans-Lutterodt

Member of Technical Staff at Brookhaven National Lab

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Publications (7)

Proceedings Article | 17 September 2014 Paper

Kinoform lens focusing of high-energy x-rays (50 - 100 keV)

S. Shastri, K. Evans-Lutterodt, R. Sheffield, A. Stein, M. Metzler, P. Kenesei

Proceedings Volume 9207, 920704 (2014) https://doi.org/10.1117/12.2062635

KEYWORDS: Computer generated holography, X-rays, Silicon, X-ray optics, Etching, Signal attenuation, Chromium, Semiconducting wafers, Diffraction, Zone plates

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Proceedings Article | 23 September 2011 Paper

Analysis of the optical design of the NSLS-II coherent hard x-ray beamline

Andrei Fluerasu, Oleg Chubar, Konstantine Kaznatcheev, Jana Baltser, Lutz Wiegart, Kenneth Evans-Lutterodt, Mary Carlucci-Dayton, Lonny Berman

Proceedings Volume 8141, 81410J (2011) https://doi.org/10.1117/12.894129

KEYWORDS: X-rays, Visibility, Laser scattering, Scattering, Optical design, Wavefronts, Hard x-rays, Sensors, Signal to noise ratio, Wave propagation

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Ultra-low emittance third-generation synchrotron radiation sources such as the NSLS-II offer excellent opportunities for the development of experimental techniques exploiting x-ray coherence. Coherent light scattered by a heterogeneous sample produces a speckle pattern characteristic for the specific arrangement of the scatterers. This may vary over time, and the resultant intensity fluctuations can be measured and analyzed to provide information about the sample dynamics. X-ray photon correlation spectroscopy (XPCS) extends the capability of dynamic light scattering to opaque and turbid samples and extends the measurements of time evolution to nanometer length scales. As a consequence XPCS became crucial in the study of dynamics in systems including, but not being limited to, colloids, polymers, complex fluids, surfaces and interfaces, phase ordering alloys, etc. In this paper we present the conceptual optical design and the theoretical performance of the Coherent Hard X-ray (CHX) beamline at NSLS-II, dedicated to XPCS and other coherent scattering techniques. For the optical design of this beamline, there is a tradeoff between the coherence needed to distinguish individual speckles and the phase acceptance (high intensity) required to measure fast dynamics with an adequate signal-to-noise level. As XPCS is a "photon hungry" technique, the beamline optimization requires maximizing the signal-to-noise ratio of the measured intensity-intensity autocorrelation function. The degree of coherence, as measured by a two-slit (Young) experiment, is used to characterize the speckle pattern visibilities. The beamline optimization strategy consists of maximization of the on-sample intensity while keeping the degree of coherence within the 0.1-0.5 range. The resulted design deviates substantially from an ad-hoc modification of a hard x-ray beamline for XPCS measurements. The CHX beamline will permit studies of complex systems and measurements of bulk dynamics down to the microsecond time scales. In general, the 10-fold increase in brightness of the NSLS-II, compared to other sources, will allow for measurements of dynamics on time-scales that are two orders of magnitude faster than what is currently possible. We also conclude that the common approximations used in evaluating the transverse coherence length would not be sufficiently accurate for the calculation of the coherent properties of an undulator-based beamline, and a thorough beamline optimization at a low-emittance source such as the NSLS-II requires a realistic wave-front propagation analysis.

Proceedings Article | 20 September 2007 Paper

Effect of x-ray beamline optics on x-ray photon correlation spectroscopy experiments

A. Sandy, K. Evans-Lutterodt, K. Fezzaa, S. Kim, S. Narayanan, M. Sprung, A. Stein

Proceedings Volume 6705, 67050N (2007) https://doi.org/10.1117/12.734397

KEYWORDS: X-rays, Computer generated holography, Speckle, Mirrors, X-ray optics, Solids, Laser scattering, Scattering, Speckle pattern, Sensors

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Proceedings Article | 15 November 2005 Paper

Kinoform lenses: toward nanometer resolution

Aaron Stein, Kenneth Evans-Lutterodt, Ashley Taylor

Proceedings Volume 6002, 600210 (2005) https://doi.org/10.1117/12.631188

KEYWORDS: Lenses, Computer generated holography, Lens design, Absorption, Silicon, Etching, Zone plates, Phase shifts, Hard x-rays, Electron beam lithography

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Proceedings Article | 4 November 2004 Paper

Hard x-ray Fresnel prisms: properties and applications

James Ablett, Kenneth Evans-Lutterodt, Aaron Stein

Proceedings Volume 5539, (2004) https://doi.org/10.1117/12.560323

KEYWORDS: Prisms, X-rays, Hard x-rays, Silicon, Wavefronts, X-ray imaging, Synchrotrons, Phase shifts, Synchrotron radiation, X-ray optics

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Proceedings Article | 4 November 2004 Paper

Energy-dependent focusing properties of a kinoform Fresnel lens

Kenneth Evans-Lutterodt, James Ablett, Aaron Stein, Donald Tennant, Fred Klemens, Ashley Taylor

Proceedings Volume 5539, (2004) https://doi.org/10.1117/12.560296

KEYWORDS: Computer generated holography, Photons, Zone plates, Fresnel lenses, X-rays, Absorption, Hard x-rays, Phase shifts, X-ray optics, Solids

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Proceedings Article | 4 November 2004 Paper

Imaging with single-dimension kinoform lenses

Aaron Stein, James Ablett, Kenneth Evans-Lutterodt, Ashley Taylor, Fred Klemens, Avi Kornblit, Sean Polvino

Proceedings Volume 5539, (2004) https://doi.org/10.1117/12.560307

KEYWORDS: Computer generated holography, Lenses, Silicon, Lens design, Zone plates, Etching, Absorption, Phase shifts, Lithography, Hard x-rays

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Showing 5 of 7 publications

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