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 Russell C. Hardie (55)
 Serge Youri Kalmykov (52)
 Monish R. Chatterjee (49)
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Articles 1  30 of 452
FullText Articles in Physics
Generation Of Broadband Thz Pulses By Laser Wakefield At Radial Boundary Of Plasma Column, Serge Y. Kalmykov, Alexander Englesbe, Jennifer Elle, Andreas SchmittSody
Generation Of Broadband Thz Pulses By Laser Wakefield At Radial Boundary Of Plasma Column, Serge Y. Kalmykov, Alexander Englesbe, Jennifer Elle, Andreas SchmittSody
Serge Youri Kalmykov
Gas Pressure Dependence Of Microwave Pulses Generated By LaserProduced Filament Plasmas, Alexander Englesbe, Jennifer Elle, Remington Reid, Adrian Lucero, Hugh Pohle, Matthew Domonkos, Serge Y. Kalmykov, Karl Krushelnick, Andreas SchmittSody
Gas Pressure Dependence Of Microwave Pulses Generated By LaserProduced Filament Plasmas, Alexander Englesbe, Jennifer Elle, Remington Reid, Adrian Lucero, Hugh Pohle, Matthew Domonkos, Serge Y. Kalmykov, Karl Krushelnick, Andreas SchmittSody
Serge Youri Kalmykov
Robustness And Mode Selectivity In ParityTime (Pt) Symmetric Lasers, M. H. Teimourpour, M. Khajavikhan, Demetrios N. Christodoulides, Ramy ElGanainy
Robustness And Mode Selectivity In ParityTime (Pt) Symmetric Lasers, M. H. Teimourpour, M. Khajavikhan, Demetrios N. Christodoulides, Ramy ElGanainy
Ramy ElGanainy
We investigate two important aspects of PT symmetric photonic molecule lasers, namely the robustness of their single longitudinal mode operation against instabilities triggered by spectral hole burning effects, and the possibility of more versatile mode selectivity. Our results, supported by numerically integrating the nonlinear rate equations and performing linear stability analysis, reveals the following: (1) In principle a second threshold exists after which single mode operation becomes unstable, signaling multimode oscillatory dynamics, (2) For a wide range of design parameters, single mode operation of PT lasers having relatively large free spectral range (FSR) can be robust even at higher gain ...
Optically Controlled LaserPlasma Electron Acceleration For Compact GammaRay Sources, Serge Y. Kalmykov, X. Davoine, Isaac Ghebregziabher, Bradley A. Shadwick
Optically Controlled LaserPlasma Electron Acceleration For Compact GammaRay Sources, Serge Y. Kalmykov, X. Davoine, Isaac Ghebregziabher, Bradley A. Shadwick
Serge Youri Kalmykov
Optically Controlled LaserPlasma Electron Accelerator For Compact GammaRay Sources, Serge Y. Kalmykov, X. Davoine, Isaac Ghebregziabher, Bradley A. Shadwick
Optically Controlled LaserPlasma Electron Accelerator For Compact GammaRay Sources, Serge Y. Kalmykov, X. Davoine, Isaac Ghebregziabher, Bradley A. Shadwick
Serge Youri Kalmykov
MultiColor, Femtosecond GammaRay Pulse Trains Driven By CombLike Electron Beams, Serge Y. Kalmykov, X. Davoine, Isaac Ghebregziabher, Bradley A. Shadwick
MultiColor, Femtosecond GammaRay Pulse Trains Driven By CombLike Electron Beams, Serge Y. Kalmykov, X. Davoine, Isaac Ghebregziabher, Bradley A. Shadwick
Serge Youri Kalmykov
Simulation Of Charge Transport In MultiIsland Tunneling Devices: Application To Disordered OneDimensional Systems At Low And High Biases, Madhusudan A. Savaikar, Douglas R. Banyai, Paul Bergstrom, John A. Jaszczak
Simulation Of Charge Transport In MultiIsland Tunneling Devices: Application To Disordered OneDimensional Systems At Low And High Biases, Madhusudan A. Savaikar, Douglas R. Banyai, Paul Bergstrom, John A. Jaszczak
John Jaszczak
Although devices have been fabricated displaying interesting singleelectron transport characteristics, there has been limited progress in the development of tools that can simulate such devices based on their physical geometry over a range of bias conditions up to a few volts per junction. In this work, we present the development of a multiisland transport simulator, MITS, a simulator of tunneling transport in multiisland devices that takes into account geometrical and material parameters, and can span low and high sourcedrain biases. First, the capabilities of MITS are demonstrated by modeling experimentaldevices described in the literature, and showing that the simulated device ...
Roughening And Preroughening Of DiamondCubic {111} Surfaces, Donald L. Woodraska, John A. Jaszczak
Roughening And Preroughening Of DiamondCubic {111} Surfaces, Donald L. Woodraska, John A. Jaszczak
John Jaszczak
A solidonsolid model for {111} surfaces of diamondcubic materials that correctly takes into account the diamondcubic crystal structure has been developed for Monte Carlo simulation. In addition to a roughening transition at temperature TR, a distinct preroughening transition at TPR≈0.43TR is indicated by divergences in the surface specific heat and orderparameter susceptibility. Preroughening appears to arise naturally in our nearestneighbor bond model from the entropic freedom available in the nontrivial crystal structure. Preroughening is shown to dramatically lower the nucleation barrier for growth and etching at low driving forces.
Mechanism For Spatial Organization In Quantum Dot SelfAssembly, Da Gao, Adam Kaczynski, John A. Jaszczak
Mechanism For Spatial Organization In Quantum Dot SelfAssembly, Da Gao, Adam Kaczynski, John A. Jaszczak
John Jaszczak
Inspired by experimental observations of spatially ordered growth hillocks on the (001) surfaces of natural graphite crystals, a mechanism for spatial organization in quantum dotselfassembly is proposed. The regular arrangement of steps from a screw dislocationgenerated growth spiral provides the overall template for such ordering. An ordered array of quantum dots may be formed or nucleated from impurities driven to the step corners by diffusion and by their interactions with the spiral’s steps and kinks. Kinetic Monte Carlo simulation of a solidonsolid model supports the feasibility of such a mechanism.
New Flexible Channels For Room Temperature Tunneling Field Effect Transistors, Boyi Hao, Anjana Asthana, Paniz Khanmohammadi, Paul Bergstrom, Douglas R. Banyai, Madhusudan A. Savaikar, John A. Jaszczak, Yoke Khin Yap
New Flexible Channels For Room Temperature Tunneling Field Effect Transistors, Boyi Hao, Anjana Asthana, Paniz Khanmohammadi, Paul Bergstrom, Douglas R. Banyai, Madhusudan A. Savaikar, John A. Jaszczak, Yoke Khin Yap
Paul Bergstrom
Tunneling field effect transistors (TFETs) have been proposed to overcome the fundamental issues of Si based transistors, such as short channel effect, finite leakage current, and high contact resistance. Unfortunately, most if not all TFETs are operational only at cryogenic temperatures. Here we report that iron (Fe) quantum dots functionalized boron nitride nanotubes (QDsBNNTs) can be used as the flexible tunneling channels of TFETs at room temperatures. The electrical insulating BNNTs are used as the onedimensional (1D) substrates to confine the uniform formation of Fe QDs on their surface as the flexible tunneling channel. Consistent semiconductorlike transport behaviors under various ...
Simulation Of Charge Transport In MultiIsland Tunneling Devices: Application To Disordered OneDimensional Systems At Low And High Biases, Madhusudan A. Savaikar, Douglas R. Banyai, Paul Bergstrom, John A. Jaszczak
Simulation Of Charge Transport In MultiIsland Tunneling Devices: Application To Disordered OneDimensional Systems At Low And High Biases, Madhusudan A. Savaikar, Douglas R. Banyai, Paul Bergstrom, John A. Jaszczak
Paul Bergstrom
Although devices have been fabricated displaying interesting singleelectron transport characteristics, there has been limited progress in the development of tools that can simulate such devices based on their physical geometry over a range of bias conditions up to a few volts per junction. In this work, we present the development of a multiisland transport simulator, MITS, a simulator of tunneling transport in multiisland devices that takes into account geometrical and material parameters, and can span low and high sourcedrain biases. First, the capabilities of MITS are demonstrated by modeling experimentaldevices described in the literature, and showing that the simulated device ...
Evaluation Of Commercial Nickel–Phosphorus Coating For Ultracold Neutron Guides Using A Pinhole Bottling Method, Robert W. Pattie, Evan R. Adamek, T. Brenner, A. Brandt, Leah J. Broussard, Nathan Callahan, Stephen M. Clayton, Chris CudeWoods, Scott A. Currie, Peter Geltenbort, Takeyasu M. Ito, T. Lauer, Chenyu Liu, Jaroslaw Majewski, Mark F. Makela, Yasuhiro Masuda, Christopher L. Morris, John C. Ramsey, Daniel J. Salvat, Alexander Saunders, Juri Schroffenegger, Zebo Tang, Wanchun Wei, Zhehui Wang, Erik B. Watkins, Albert R. Young, B.A. Zeck
Evaluation Of Commercial Nickel–Phosphorus Coating For Ultracold Neutron Guides Using A Pinhole Bottling Method, Robert W. Pattie, Evan R. Adamek, T. Brenner, A. Brandt, Leah J. Broussard, Nathan Callahan, Stephen M. Clayton, Chris CudeWoods, Scott A. Currie, Peter Geltenbort, Takeyasu M. Ito, T. Lauer, Chenyu Liu, Jaroslaw Majewski, Mark F. Makela, Yasuhiro Masuda, Christopher L. Morris, John C. Ramsey, Daniel J. Salvat, Alexander Saunders, Juri Schroffenegger, Zebo Tang, Wanchun Wei, Zhehui Wang, Erik B. Watkins, Albert R. Young, B.A. Zeck
Robert W. Pattie Jr.
Comparing Experts And Novices In Solving Electrical Circuit Problems With The Help Of EyeTracking, David Rosengrant, Colin Thomson, Taha Mzoughi
Comparing Experts And Novices In Solving Electrical Circuit Problems With The Help Of EyeTracking, David Rosengrant, Colin Thomson, Taha Mzoughi
David Rosengrant
In order to help introductory physics students understand and learn to solve problems with circuits, we must first understand how they differ from experts. This preliminary study focuses on problemsolving dealing with electrical circuits. We investigate difficulties novices have with circuits and compare their work with those of experts. We incorporate the use of an eyetracker to investigate any possible differences or similarities on how experts and novices solve electrical circuit problems. Our results show similarities in gaze patterns among all subjects on the components of the circuit. We further found that experts would look back at the circuit while ...
Comparing Multiple Turbulence Restoration Algorithms Performance On Noisy Anisoplanatic Imagery, Michael Armand Rucci, Russell C. Hardie, Alexander J. Dapore
Comparing Multiple Turbulence Restoration Algorithms Performance On Noisy Anisoplanatic Imagery, Michael Armand Rucci, Russell C. Hardie, Alexander J. Dapore
Russell C. Hardie
In this paper, we compare the performance of multiple turbulence mitigation algorithms to restore imagery degraded by atmospheric turbulence and camera noise. In order to quantify and compare algorithm performance, imaging scenes were simulated by applying noise and varying levels of turbulence. For the simulation, a MonteCarlo wave optics approach is used to simulate the spatially and temporally varying turbulence in an image sequence. A PoissonGaussian noise mixture model is then used to add noise to the observed turbulence image set. These degraded image sets are processed with three separate restoration algorithms: Lucky Look imaging, bispectral speckle imaging, and a ...
Analysis Of Various Classification Techniques For Computer Aided Detection System Of Pulmonary Nodules In Ct, Barath Narayanan Narayanan, Russell C. Hardie, Temesguen Messay
Analysis Of Various Classification Techniques For Computer Aided Detection System Of Pulmonary Nodules In Ct, Barath Narayanan Narayanan, Russell C. Hardie, Temesguen Messay
Russell C. Hardie
Lung cancer is the leading cause of cancer death in the United States. It usually exhibits its presence with the formation of pulmonary nodules. Nodules are round or ovalshaped growth present in the lung. Computed Tomography (CT) scans are used by radiologists to detect such nodules. Computer Aided Detection (CAD) of such nodules would aid in providing a second opinion to the radiologists and would be of valuable help in lung cancer screening. In this research, we study various feature selection methods for the CAD system framework proposed in FlyerScan. Algorithmic steps of FlyerScan include (i) local contrast enhancement (ii ...
On The Simulation And Mitigation Of Anisoplanatic Optical Turbulence For Long Range Imaging, Russell C. Hardie, Daniel A. Lemaster
On The Simulation And Mitigation Of Anisoplanatic Optical Turbulence For Long Range Imaging, Russell C. Hardie, Daniel A. Lemaster
Russell C. Hardie
We describe a numerical wave propagation method for simulating long range imaging of an extended scene under anisoplanatic conditions. Our approach computes an array of point spread functions (PSFs) for a 2D grid on the object plane. The PSFs are then used in a spatially varying weighted sum operation, with an ideal image, to produce a simulated image with realistic optical turbulence degradation. To validate the simulation we compare simulated outputs with the theoretical anisoplanatic tilt correlation and differential tilt variance. This is in addition to comparing the long and shortexposure PSFs, and isoplanatic angle. Our validation analysis shows an ...
Recursive NonLocal Means Filter For Video Denoising, Redha A. Ali, Russell C. Hardie
Recursive NonLocal Means Filter For Video Denoising, Redha A. Ali, Russell C. Hardie
Russell C. Hardie
In this paper, we propose a computationally efficient algorithm for video denoising that exploits temporal and spatial redundancy. The proposed method is based on nonlocal means (NLM). NLM methods have been applied successfully in various image denoising applications. In the singleframe NLM method, each output pixel is formed as a weighted sum of the center pixels of neighboring patches, within a given search window. The weights are based on the patch intensity vector distances. The process requires computing vector distances for all of the patches in the search window. Direct extension of this method from 2D to 3D, for video ...
Block Matching And Wiener Filtering Approach To Optical Turbulence Mitigation And Its Application To Simulated And Real Imagery With Quantitative Error Analysis, Russell C. Hardie, Michael Armand Rucci, Barry K. Karch, Alexander J. Dapore
Block Matching And Wiener Filtering Approach To Optical Turbulence Mitigation And Its Application To Simulated And Real Imagery With Quantitative Error Analysis, Russell C. Hardie, Michael Armand Rucci, Barry K. Karch, Alexander J. Dapore
Russell C. Hardie
We present a blockmatching and Wiener filtering approach to atmospheric turbulence mitigation for longrange imaging of extended scenes. We evaluate the proposed method, along with some benchmark methods, using simulated and realimage sequences. The simulated data are generated with a simulation tool developed by one of the authors. These data provide objective truth and allow for quantitative error analysis. The proposed turbulence mitigation method takes a sequence of shortexposure frames of a static scene and outputs a single restored image. A blockmatching registration algorithm is used to provide geometric correction for each of the individual input frames. The registered frames ...
Simulation Of Anisoplanatic Imaging Through Optical Turbulence Using Numerical Wave Propagation With New Validation Analysis, Russell C. Hardie, Jonathan D. Power, Daniel A. Lemaster, Douglas R. Droege, Szymon Gladysz, Santasri BosePillai
Simulation Of Anisoplanatic Imaging Through Optical Turbulence Using Numerical Wave Propagation With New Validation Analysis, Russell C. Hardie, Jonathan D. Power, Daniel A. Lemaster, Douglas R. Droege, Szymon Gladysz, Santasri BosePillai
Russell C. Hardie
We present a numerical wave propagation method for simulating imaging of an extended scene under anisoplanatic conditions. While isoplanatic simulation is relatively common, few tools are specifically designed for simulating the imaging of extended scenes under anisoplanatic conditions. We provide a complete description of the proposed simulation tool, including the wave propagation method used. Our approach computes an array of point spread functions (PSFs) for a twodimensional grid on the object plane. The PSFs are then used in a spatially varying weighted sum operation, with an ideal image, to produce a simulated image with realistic optical turbulence degradation. The degradation ...
Differential Tilt Variance Effects Of Turbulence In Imagery: Comparing Simulation With Theory, Daniel A. Lemaster, Russell C. Hardie, Szymon Gladysz, Matthew D. Howard, Michael Armand Rucci, Matthew E. Trippel, Jonathan D. Power, Barry K. Karch
Differential Tilt Variance Effects Of Turbulence In Imagery: Comparing Simulation With Theory, Daniel A. Lemaster, Russell C. Hardie, Szymon Gladysz, Matthew D. Howard, Michael Armand Rucci, Matthew E. Trippel, Jonathan D. Power, Barry K. Karch
Russell C. Hardie
Differential tilt variance is a useful metric for interpreting the distorting effects of turbulence in incoherent imaging systems. In this paper, we compare the theoretical model of differential tilt variance to simulations. Simulation is based on a Monte Carlo wave optics approach with split step propagation. Results show that the simulation closely matches theory. The results also show that care must be taken when selecting a method to estimate tilts.
MultiColor ΓRays From CombLike Electron Beams Driven By Incoherent Stacks Of Laser Pulses, Serge Y. Kalmykov, X. Davoine, Isaac Ghebregziabher, Bradley A. Shadwick
MultiColor ΓRays From CombLike Electron Beams Driven By Incoherent Stacks Of Laser Pulses, Serge Y. Kalmykov, X. Davoine, Isaac Ghebregziabher, Bradley A. Shadwick
Serge Youri Kalmykov
Chiral Light Intrinsically Couples To Extrinsic/PseudoChiral Metasurfaces Made Of Tilted Gold Nanowires, Alessandro Belardini, Marco Centini, Grigore Leahu, David C. Hooper, Roberto Li Voti, Eugenio Fazio, Joseph W. Haus, Andrew Sarangan, Ventsislav K. Valev, Concita Sibilia
Chiral Light Intrinsically Couples To Extrinsic/PseudoChiral Metasurfaces Made Of Tilted Gold Nanowires, Alessandro Belardini, Marco Centini, Grigore Leahu, David C. Hooper, Roberto Li Voti, Eugenio Fazio, Joseph W. Haus, Andrew Sarangan, Ventsislav K. Valev, Concita Sibilia
Andrew Sarangan
Extrinsic or pseudochiral (meta)surfaces have an achiral structure, yet they can give rise to circular dichroism when the experiment itself becomes chiral. Although these surfaces are known to yield differences in reflected and transmitted circularly polarized light, the exact mechanism of the interaction has never been directly demonstrated. Here we present a comprehensive linear and nonlinear optical investigation of a metasurface composed of tilted gold nanowires. In the linear regime, we directly demonstrate the selective absorption of circularly polarised light depending on the orientation of the metasurface. In the nonlinear regime, we demonstrate for the first time how second ...
Chiral Light Intrinsically Couples To Extrinsic/PseudoChiral Metasurfaces Made Of Tilted Gold Nanowires, Alessandro Belardini, Marco Centini, Grigore Leahu, David C. Hooper, Roberto Li Voti, Eugenio Fazio, Joseph W. Haus, Andrew Sarangan, Ventsislav K. Valev, Concita Sibilia
Chiral Light Intrinsically Couples To Extrinsic/PseudoChiral Metasurfaces Made Of Tilted Gold Nanowires, Alessandro Belardini, Marco Centini, Grigore Leahu, David C. Hooper, Roberto Li Voti, Eugenio Fazio, Joseph W. Haus, Andrew Sarangan, Ventsislav K. Valev, Concita Sibilia
Joseph W Haus
Extrinsic or pseudochiral (meta)surfaces have an achiral structure, yet they can give rise to circular dichroism when the experiment itself becomes chiral. Although these surfaces are known to yield differences in reflected and transmitted circularly polarized light, the exact mechanism of the interaction has never been directly demonstrated. Here we present a comprehensive linear and nonlinear optical investigation of a metasurface composed of tilted gold nanowires. In the linear regime, we directly demonstrate the selective absorption of circularly polarised light depending on the orientation of the metasurface. In the nonlinear regime, we demonstrate for the first time how second ...
Role Of Antenna Modes And Field Enhancement In Second Harmonic Generation From Dipole Nanoantennas, Domenico De Ceglia, Maria Antonietta Vincenti, Costantino De Angelis, Andrea Locatelli, Joseph W. Haus, Michael Scalora
Role Of Antenna Modes And Field Enhancement In Second Harmonic Generation From Dipole Nanoantennas, Domenico De Ceglia, Maria Antonietta Vincenti, Costantino De Angelis, Andrea Locatelli, Joseph W. Haus, Michael Scalora
Joseph W. Haus
We study optical second harmonic generation from metallic dipole antennas with narrow gaps. Enhancement of the fundamentalfrequency field in the gap region plays a marginal role on conversion efficiency. In the symmetric configuration, i.e., with the gap located at the center of the antenna axis, reducing gap size induces a significant redshift of the maximum conversion efficiency peak. Either enhancement or inhibition of secondharmonic emission may be observed as gap size is decreased, depending on the antenna mode excited at the harmonic frequency. The secondharmonic signal is extremely sensitive to the asymmetry introduced by gap’s displacements with respect ...
Tunable Narrow Band Difference Frequency Thz Wave Generation In Dast Via Dual Seed Ppln Opg, Brian Dolasinski, Peter E. Powers, Joseph W. Haus, Adam Cooney
Tunable Narrow Band Difference Frequency Thz Wave Generation In Dast Via Dual Seed Ppln Opg, Brian Dolasinski, Peter E. Powers, Joseph W. Haus, Adam Cooney
Joseph W. Haus
We report a widely tunable narrowband terahertz (THz) source via difference frequency generation (DFG). A narrowband THz source uses the output of dual seeded periodically poled lithium niobate (PPLN) optical parametric generators (OPG) combined in the nonlinear crystal 4dimthylaminoNmethyl4stilbazoliumtosylate (DAST). We demonstrate a seamlessly tunable THZ output that tunes from 1.5 THz to 27 THz with a minimum bandwidth of 3.1 GHz. The effects of dispersive phase matching, twophoton absorption, and polarization were examined and compared to a power emission model that consisted of the current accepted parameters of DAST.
Practical Guide To The Realization Of A Convertible Optical Trapping System, Chenglong Zhao
Practical Guide To The Realization Of A Convertible Optical Trapping System, Chenglong Zhao
Chenglong Zhao
In this article, we provide a detailed guide to the construction of a convertible optical trapping system for either singlebeam or counterpropagating trap. The singlebeam trap maintains all the functionalities that a conventional optical tweezer has. While the counterpropagating trap allows for the trapping of particles that singlebeam trap cannot handle. The counterpropagating trap can be easily switched to a singlebeam trap, and vice versa. Therefore, this convertible optical trapping system allows for the trapping and manipulation of particles with a wide variety of sizes and materials.
Hybrid Spatiotemporal Coherent Pulse Addition Of A Picosecond FlashlampPumped Ndyag Laser.Pdf, Ahmad Azim
Hybrid Spatiotemporal Coherent Pulse Addition Of A Picosecond FlashlampPumped Ndyag Laser.Pdf, Ahmad Azim
Ahmad Azim
Accordion Effect Revisited: Generation Of CombLike Electron Beams In Plasma Channels, Serge Y. Kalmykov, X. Davoine, Remi Lehe, Agustin F. Lifschitz, Bradley A. Shadwick
Accordion Effect Revisited: Generation Of CombLike Electron Beams In Plasma Channels, Serge Y. Kalmykov, X. Davoine, Remi Lehe, Agustin F. Lifschitz, Bradley A. Shadwick
Serge Youri Kalmykov
Examination Of The Nonlinear Dynamics And Possible Chaos Encryption In A ZerothOrder AcoustoOptic Bragg Modulator With Feedback, Fares S. Almehmadi, Monish Ranjan Chatterjee
Examination Of The Nonlinear Dynamics And Possible Chaos Encryption In A ZerothOrder AcoustoOptic Bragg Modulator With Feedback, Fares S. Almehmadi, Monish Ranjan Chatterjee
Monish R. Chatterjee
Zerothorder chaos modulation in a Bragg cell is examined such that tracking problems due to spatial deflections of the firstorder AO beam at the receiver may be avoided by switching to the undeviated zerothorder beam.
Anisoplanatic Electromagnetic Image Propagation Through Narrow Or Extended Phase Turbulence Using AltitudeDependent Structure Parameter, Monish Ranjan Chatterjee, Ali Mohamed
Anisoplanatic Electromagnetic Image Propagation Through Narrow Or Extended Phase Turbulence Using AltitudeDependent Structure Parameter, Monish Ranjan Chatterjee, Ali Mohamed
Monish R. Chatterjee
The effects of turbulence on anisoplanatic imaging are often modeled through the use of a sequence of phase screens distributed along the optical path. We implement the splitstep wave algorithm to examine turbulencecorrupted images.