Dr. Yana Z. Williams Profile

Dr. Yana Z. Williams

AST at NASA Langley Research Ctr

SPIE Involvement:

Author | Leadership Workshop Facilitator

Proceedings Article | 20 November 2024 Poster + Paper

CLARREO Pathfinder solar diffuser pre-flight calibration

Georgi Georgiev, Julia Barsi, Nathan Kelley, Elena Georgieva, Yana Williams, Paul Smith, Anthony Barsic

Proceedings Volume 13192, 1319217 (2024) https://doi.org/10.1117/12.3034029

KEYWORDS: Calibration, Diffusers, Sensors, Bidirectional reflectance transmission function, Polarization, Photodiodes, Indium gallium arsenide, Imaging systems, Transmittance, Silicon

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Proceedings Article | 7 September 2018 Presentation + Paper

Radiometric calibration discrepancy and root cause analysis for radiation budget instrument

Yana Williams, Mohan Shankar, Loren Woody, Richard Hertel, Joe Predina, Hyung Lee, Georgi Georgiev, Cindy Young, Christopher Randall, Kory Priestley

Proceedings Volume 10764, 107640T (2018) https://doi.org/10.1117/12.2326032

KEYWORDS: Calibration, Sensors, Telescopes, Optical filters, Indium gallium arsenide, Infrared radiation, Signal detection, Radiometric corrections, Uncertainty analysis, Earth's atmosphere

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Proceedings Article | 31 May 2013 Paper

Optical fiber-based full-spectral monitoring system for weathering testing

Yana Williams, Jacob Zhang, Kurt Scott, Henry Hardcastle

Proceedings Volume 8720, 87200X (2013) https://doi.org/10.1117/12.2018960

KEYWORDS: Calibration, Spectrometers, Lamps, Charge-coupled devices, Stray light, Spectral calibration, Optical fibers, Xenon, CCD image sensors, Sensors

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Proceedings Article | 11 November 2010 Paper

Phase shift based measurements using a pocket LCD projector

Yana Williams, Kevin Harding

Proceedings Volume 7855, 78550E (2010) https://doi.org/10.1117/12.871214

KEYWORDS: Projection systems, LCDs, 3D metrology, Imaging systems, Inspection, Metals, 3D image processing, Cameras, Phase measurement, Phase shifting

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Proceedings Article | 3 September 2010 Paper

Dual-illumination NIR system for wafer level defect inspection

Yana Williams, Kevin Harding, Gil Abramovich, Christopher Nafis, Eric Tkaczyk, Kristian Andreini, Henry Chen, Glenn Bindley

Proceedings Volume 7793, 77930I (2010) https://doi.org/10.1117/12.861038

KEYWORDS: Semiconducting wafers, Imaging systems, Light sources and illumination, Tellurium, Cameras, Inspection, Manufacturing, Near infrared, Sensors, Light scattering

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Proceedings Article | 3 September 2010 Paper

CZT smart dicing strategy for cost reduction using defect imaging and random-access machining

J. Eric Tkaczyk, Kristian Andreini, Tan Zhang, Kevin Harding, Gil Abramovich, Yana Williams, Christopher Nafis, Wenwu Zhang

Proceedings Volume 7806, 78060L (2010) https://doi.org/10.1117/12.865861

KEYWORDS: Sensors, Semiconducting wafers, Crystals, Image segmentation, Infrared imaging, Inspection, Laser cutting, 3D image processing, Ultrasonography, Image processing

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Proceedings Article | 10 September 2009 Paper

Three-dimensional embedded defect detection and localization in a semi-transparent medium

Gil Abramovich, Christopher Nafis, Yana Williams, Kevin Harding, Eric Tkaczyk

Proceedings Volume 7432, 74321C (2009) https://doi.org/10.1117/12.830444

KEYWORDS: Cameras, Defect detection, Signal to noise ratio, Imaging systems, Sensors, 3D metrology, 3D image processing, Interference (communication), Image analysis, Detection and tracking algorithms

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Proceedings Article | 15 September 2006 Paper

Tunable 3D photonic crystals by liquid crystal infiltration

C. Summers, E. Graugnard, D. Gaillot, J. King, Y. Zhang-Williams, I. Khoo

Proceedings Volume 6332, 63320R (2006) https://doi.org/10.1117/12.682654

KEYWORDS: Liquid crystals, Dielectrics, Refractive index, Photonic crystals, Atomic layer deposition, Reflectivity, Optical spheres, Optical properties, Modulation, Electro optics

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Proceedings Article | 20 August 2005 Paper

Electro-optical and nonlinear optical properties of semiconductor nanorod doped liquid crystals

Yana Williams, Kan Chan, Jae Hong Park, Iam Choon Khoo, Brad Lewis, Thomas Mallouk

Proceedings Volume 5936, 593613 (2005) https://doi.org/10.1117/12.617730

KEYWORDS: Liquid crystals, Photorefraction, Electro optics, Complex systems, Diffraction, Semiconductors, Dielectrics, Anisotropy, Electro optical systems, Nanorods

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Proceedings Article | 15 October 2004 Paper

Direct optical holographic fabrication of photonic crystals in polymeric dispersed nematic and isotropic liquid crystals

Iam Khoo, Yana Williams, Kan Chen

Proceedings Volume 5518, (2004) https://doi.org/10.1117/12.563061

KEYWORDS: Liquid crystals, Polymers, Photonic crystals, Diffraction, Liquids, Diffraction gratings, Scanning electron microscopy, Holography, Crystal optics, Switching

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Proceedings Article | 5 January 2004 Paper

Supra-photorefractivity of C60- and carbon-nanotube-doped nematic liquid crystals

Iam-Choon Khoo, Yana Zhang, Andres Diaz, Jianwu Ding, Kan Chen

Proceedings Volume 5213, (2004) https://doi.org/10.1117/12.504367

KEYWORDS: Liquid crystals, Diffraction, Scattering, Diffraction gratings, Light scattering, Carbon nanotubes, Nonlinear optics, Molecules, Transient nonlinear optics, Carbon

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Proceedings Article | 12 December 2002 Paper

Widely tunable nonlinear liquid crystal-based photonic crystals

Iam-Choon Khoo, Yana Zhang, Andrew Diaz, Jianwu Ding, Ivan Divliansky, Kito Holliday, Theresa Mayer, V. Crespi, David Scrymgeour, V. Gopalan

Proceedings Volume 4799, (2002) https://doi.org/10.1117/12.453287

KEYWORDS: Liquid crystals, Photonic crystals, Crystals, Refractive index, Liquids, Diffraction gratings, Switching, Nonlinear crystals, Switches, Pulsed laser operation

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Proceedings Article | 11 December 2001 Paper

Nonlinear liquid crystals in periodic structures

Atsushi Shishido, Ivan Divliansky, Suzushi Nishimura, Yana Zhang, Jayantilal Patel, Thomas Mallouk, Theresa Mayer, Iam-Choon Khoo

Proceedings Volume 4463, (2001) https://doi.org/10.1117/12.449944

KEYWORDS: Liquid crystals, Diffraction, Diffraction gratings, Glasses, Refractive index, Dielectrics, Polymers, Nonlinear optics, Photonic crystals, Photomasks

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Proceedings Article | 11 December 2001 Paper

Communication-wavelength (1.55 um) laser-induced refractive index change in nematic liquid crystalline films

Iam-Choon Khoo, Malgosia Kaczmarek, Min-Yi Shih, Atsushi Shishido, Jianwu Ding, Yana Zhang, Michael Wood

Proceedings Volume 4463, (2001) https://doi.org/10.1117/12.449937

KEYWORDS: Liquid crystals, Refractive index, Crystals, Thermal effects, Liquids, Infrared radiation, Phase modulation, Laser beam diagnostics, Laser crystals, Liquid crystal lasers

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Showing 5 of 14 publications

Conference Committee Involvement (10)

Optical System Alignment, Tolerancing, and Verification XI

6 August 2017 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification X

28 August 2016 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification IX

9 August 2015 | San Diego, California, United States

Photonic Applications for Aviation, Aerospace, Commercial, and Harsh Environments V

19 August 2014 | San Diego, California, United States

Optical System Alignment, Tolerancing, and Verification VIII

17 August 2014 | San Diego, California, United States

Showing 5 of 10 Conference Committees

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