You searched on: Author: zachary levine
Displaying records 21 to 30 of 118 records.
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21. Efficient photon pair sources based on Silicon-on-Insulator microresonators
Jun Chen, Zachary H Levine, Jingyun Fan, Alan L Migdall
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 ...
22. Phantoms and the Problem of Quantification in Medical Computed Tomography (CT)
Zachary H Levine
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 ...
23. RECIST vs. Volume Measurement in Medical CT Using Ellipsoids of Known Size
Zachary H Levine, Bruce R. Borchardt, Nolan J Brandenburg, Charles W Clark, Balasubramanian Muralikrishnan, Craig M Shakarji, Joseph J. Chen, Eliot L. Siegel
(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 ...
24. Heralded, pure-state single-photon source based
on a Potassium Titanyl Phosphate waveguide
Zachary H Levine, Jingyun Fan, Jun Chen, Alexander E. Ling, Alan L Migdall
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 ...
25. Design considerations for a cascaded grating interferometer suitable for EUV interference lithography
Zachary H Levine, Thomas B Lucatorto, Steven E Grantham
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 ...
26. A Low-Cost Density Reference Phantom for Computed Tomography
Zachary H Levine, Ming-Dong Li, Anthony P Reeves, David F Yankelevitz, Joseph J Chen, Eliot L Siegel, Adele P Peskin, Diana N. Zeiger
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 ...
27. A Low Cost Fiducial Reference for Computed Tomography
Zachary H Levine, Steven E Grantham, Daniel S Sawyer, Anthony P Reeves, David F Yankelevitz
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 ...
28. Diffraction and Electron Energy Loss to Plasmons in Silicon Slabs
Zachary H Levine
Dynamic diffraction patterns have been calculated for 25-nm thick slabs of silicon with , , and  faces for a 120 keV electron beam. The calculation used the mixed dynamical form factor in the dielectric formulation. Dielectric matric ...
29. The Magic Angle Mystery in Electron Energy Loss Spectra: Relativistic and Dielectric Corrections
A P Sorini, J J Rehr, Zachary H Levine
Recently it has been demonstrated that a careful treatment of both longitudinal and transverse matrix elements in electron energy loss spectra can explain the mystery of relativistic effects on the magic angle. Here we show that there is an addition ...
30. Controlling the Band Gap in Zigzag Graphene Nanoribbons With an Electric Field Induced by a Polar Molecule
Sergio Dalosto, Zachary H Levine
Graphene nanoribbons with both armchair- and zigzag-shaped hydrogen-passivated edges (AGNR and ZGNR) have band gaps. Son et al. showed that the gap s value depends on the width of the ribbon and that the application of a uniform external electric fi ...