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You searched on: Author: zachary levine

Displaying records 21 to 30 of 120 records.
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21. Polarization-Entangled Photon Pairs From a Periodically Poled Cystalline Waveguide
Published: 3/24/2011
Authors: Zachary H Levine, Jingyun Fan, Jun Chen, Alan L Migdall
Abstract: A proposal is made for the generation of polarization-entangled photon pairs from a periodically poled crystal. The theory is formulated in terms of colinear propagation for application to waveguides. The key feature of the theory is the use of typ ...

22. Frequency-bin Entangled Comb of Photon Pairs From a Silicon-on-Insulator Micro-Resonator
Published: 1/13/2011
Authors: Jun Chen, Zachary H Levine, Jingyun Fan, Alan L Migdall
Abstract: We present a quantum-mechanical theory to describe narrow-band photon- pair generation via four-wave mixing in a Silicon-on-Insulator (SOI) micro- resonator. We also provide design principles for efficient photon-pair generation in an SOI mic ...

23. Efficient photon pair sources based on Silicon-on-Insulator microresonators
Published: 8/30/2010
Authors: Jun Chen, Zachary H Levine, Jingyun Fan, Alan L Migdall
Abstract: We present a general quantum-mechanical formalism to describe photon pair generation via four-wave mixing in a Silicon-on-Insulator (SOI) microresonator. We also provide design principles for efficient photon-pair generation in a SOI microresonator t ...

24. Phantoms and the Problem of Quantification in Medical Computed Tomography (CT)
Published: 6/15/2010
Author: Zachary H Levine
Abstract: Medical CT may be made more useful by increasing the quantification. Phantoms have shown that volumetric analysis may be ten times more precise than the standard RECIST metric. Phantoms have a big role to play defining uncertainty and providing co ...

25. RECIST vs. Volume Measurement in Medical CT Using Ellipsoids of Known Size
Published: 4/12/2010
Authors: Zachary H Levine, Bruce R. Borchardt, Nolan J Brandenburg, Charles W Clark, Balasubramanian Muralikrishnan, Craig M Shakarji, Joseph J. Chen, Eliot L. Siegel
Abstract: (a) Purpose: We wanted to test the extent to which two common methods of determining the sizes of tumors would perform when compared to a statistically significant number of well-characterized reference objects. The size of the objects was chosen to ...

26. Heralded, pure-state single-photon source based on a Potassium Titanyl Phosphate waveguide
Published: 2/15/2010
Authors: Zachary H Levine, Jingyun Fan, Jun Chen, Alexander E. Ling, Alan L Migdall
Abstract: WWe analyze the generation of single spatial mode, spectrally uncorrelated photon pairs via type II spontaneous parametric downconversion in a Potassium Titanyl Phosphate (KTP) waveguide using real experimental parameters. We show that this source ...

27. Design considerations for a cascaded grating interferometer suitable for EUV interference lithography
Published: 4/10/2009
Authors: Zachary H Levine, Thomas B Lucatorto, Steven E Grantham
Abstract: The potential of a cascaded grating interferometer to perform Extreme Ultraviolet Interference Lithography (EUV-IL) depends on its beng coupled to a source that is bright enought to allow exposures ina reasonable time.   This work presents a ...

28. A Low-Cost Density Reference Phantom for Computed Tomography
Published: 1/2/2009
Authors: Zachary H Levine, Ming-Dong Li, Anthony P Reeves, David F Yankelevitz, Joseph J Chen, Eliot L Siegel, Adele P Peskin, Diana N. Zeiger
Abstract: We have characterized a commercially-available polyurethane foam which is marketed for modeling parts in the aircraft, automotive, and related industries. We find that the foam may be suitable for use as a density reference standard in the range bel ...

29. A Low Cost Fiducial Reference for Computed Tomography
Published: 11/11/2008
Authors: Zachary H Levine, Steven E Grantham, Daniel S Sawyer, Anthony P Reeves, David F Yankelevitz
Abstract: Rationale and Objectives. To detect the growth in lesions, it is necessary to ensure that the apparent changes in size are above the noise floor of the system. By introducing a fiducial reference, it may be possible to detect smaller changes in le ...

30. Diffraction and Electron Energy Loss to Plasmons in Silicon Slabs
Published: 3/10/2008
Author: Zachary H Levine
Abstract: Dynamic diffraction patterns have been calculated for 25-nm thick slabs of silicon with [001], [111], and [110] faces for a 120 keV electron beam. The calculation used the mixed dynamical form factor in the dielectric formulation. Dielectric matric ...

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