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Articles 1  30 of 57
FullText Articles in Physics
From Photon To Neuron Chapter 17: Rainbows And Other Caustics, Philip C. Nelson
From Photon To Neuron Chapter 17: Rainbows And Other Caustics, Philip C. Nelson
Department of Physics Papers
This chapter extends Part III of the book From Photon to Neuron (Princeton Univ Press 2017). This preliminary version is made freely available asis in the hope that it will be useful.
Investigation Of Spin And DipCoating Phase Change Chalcogenide Materials As A Novel Technique For Coating And Functionalizing Conformal Optics, Paul Vecchio
Physics and Astronomy Summer Fellows
Chalcogenide glasses (ChGs) have excellent infrared (IR) transparency ranging up to 20 μm, large nonlinear refractive indices, and tailorable thermooptic coefficients (dn/dT) that have great potential for applications in detectors, sensors, waveguides, imaging devices, photonic waveguides, acoustooptics, and optical devices. Spin and dip coating ChGs from solution is a lowcost, simple, and scalable method for depositing films over a large area. In this study, we utilize the novel approach of spin and dip coating to create thin ChG films of arsenic trisulfide (As_{2}S_{3}) and arsenic selenide (As_{2}Se_{3}). To realize the full potential of ...
Exploring The Solvability Of The JaynesCummings And JaynesCummingsLike Models: Implementing Quantum Control, Austen Couvertier
Exploring The Solvability Of The JaynesCummings And JaynesCummingsLike Models: Implementing Quantum Control, Austen Couvertier
Student Publications
In this paper we aim to explore the dynamics and overall solvability of the JaynesCummings \& JaynesCummingsLike models. As a lens to understand these dynamics, we focused on cases where the parameters of the system were made timedependent. All previous work on solving the dynamics of the JaynesCummings models has relied heavily on the use of differential methods and setting the parameters as timeindependent constants which were zero or one. To account for this, we utilized the WeiNorman method which allowed us to analytical solve the timedependent Hamiltonian. Through the use of this method, we can understand the more general characteristics ...
Reflectance Of Xuv Light On A Two Dimensional Conducting Rough Surface, Chelsea Thangavelu
Reflectance Of Xuv Light On A Two Dimensional Conducting Rough Surface, Chelsea Thangavelu
Student Publications
A Fortran program is set up to solve for the reflectance of XUV light from a rough two dimensional surface, resembling experimental mirrors used to reflect XUV light. Because the roughness of the surface is on the order of magnitude of the wavelength of XUV light, our approach requires a Greene's Function instead of using traditional geometrical optics or physical optics. Our Fortran program calculates the impedance (Z) matrix which requires integration over Greene's Function at nonsingular points. The Z matrix helps solve for the induced surface current J(x') at nonsingular points. At singular points, the program ...
Studies In Mesoscopics And Quantum Microscopies, Zhenghao Ding, Gabriel C. Spalding
Studies In Mesoscopics And Quantum Microscopies, Zhenghao Ding, Gabriel C. Spalding
Honors Projects
This thesis begins with a foundational section on quantum optics. The singlephoton detectors used in the first chapter were obtained through the Advanced Laboratory Physics Association (ALPhA), which brokered reduced cost for educational use, and the aim of the singlephoton work presented in Chapter 1 is to develop modules for use in Illinois Wesleyan's instructional labs beyond the first year of university. Along with the American Association of Physics Teachers, ALPhA encourages capstonelevel work, such as Chapter 1 of this honors thesis, which is explicitly designed to play the role of passing on, to a next generation of physics ...
LowCost Student Experiments In Optics, Robert Polak, Austin J. Cua, Daniel J. Perez, Mallory Q. Robertson, Justin A. Stuck, Jordan M. Thomas
LowCost Student Experiments In Optics, Robert Polak, Austin J. Cua, Daniel J. Perez, Mallory Q. Robertson, Justin A. Stuck, Jordan M. Thomas
Physics: Faculty Publications and Other Works
No abstract provided.
The Quest For High Power Lasers: Forcing Mutual Coherence In Broad Area Diode Lasers, Jonathan R. Wurtz
The Quest For High Power Lasers: Forcing Mutual Coherence In Broad Area Diode Lasers, Jonathan R. Wurtz
Student Research Projects
This poster explains efforts to improve spatial beam quality of diode array stacks using an external optical feedback system to force coherence of individual diodes.
Scalar Wave Scattering By TwoLayer Radial Inhomogeneities, Umaporn Nuntaplook, John Adam
Scalar Wave Scattering By TwoLayer Radial Inhomogeneities, Umaporn Nuntaplook, John Adam
Mathematics & Statistics Faculty Publications
It is shown that the iteration technique gives a better approximation for the problem with long wavelengths.
Characterization Of Samples For Optimization Of Infrared Stray Light Coatings, Carey L. Baxter, Rebecca Salvemini, Zaheer A. Ali, Patrick Waddell, Greg Perryman, Bob Thompson
Characterization Of Samples For Optimization Of Infrared Stray Light Coatings, Carey L. Baxter, Rebecca Salvemini, Zaheer A. Ali, Patrick Waddell, Greg Perryman, Bob Thompson
STAR (STEM Teacher and Researcher) Presentations
NASA’s Stratospheric Observatory for Infrared Astronomy (SOFIA) is a converted 747SP that houses a 2.5 m telescope that observes the sky through an opening in the side of the aircraft. Because it flies at altitudes up to 45,000 feet, SOFIA gets 99.99% transmission in the infrared. Multiple science instruments mount one at a time on the telescope to interpret infrared and visible light from target sources. Ball Infrared Black (BIRB) currently coats everything that the optics sees inside the telescope assembly (TA) cavity in order to eliminate noise from the glow of background sky, aircraft exhaust ...
Computational Renormalization Scheme For Quantum Field Theories, Rainer Grobe, Qichang Su, R E. Wagner
Computational Renormalization Scheme For Quantum Field Theories, Rainer Grobe, Qichang Su, R E. Wagner
Faculty publications – Physics
We propose an alternative technique for numerically renormalizing quantum field theories based on their Hamiltonian formulation. This method is nonperturbative in nature and, therefore, exact to all orders. It does not require any correlation functions or Feynman diagrams. We illustrate this method for a model Yukawalike theory describing the interaction of electrons and positrons with model photons in one spatial dimension. We show that, after mass renormalization of the fermionic and bosonic singleparticle states, all other states in the Fock space have finite energies, which are independent of the momentum cutoff.
Enhancement Of ElectronPositron Pair Creation Due To Transient Excitation Of FieldInduced Bound States, M Jiang, Q Z. Lv, Z M. Sheng, Rainer Grobe, Qichang Su
Enhancement Of ElectronPositron Pair Creation Due To Transient Excitation Of FieldInduced Bound States, M Jiang, Q Z. Lv, Z M. Sheng, Rainer Grobe, Qichang Su
Faculty publications – Physics
We study the creation of electronpositron pairs induced by two spatially separated electric fields that vary periodically in time. The results are based on largescale computer simulations of the timedependent Dirac equation in reduced spatial dimensions. When the separation of the fields is very large, the pair creation is caused by multiphoton transitions and mainly determined by the frequency of the fields. However, for small spatial separations a coherence effect can be observed that can enhance or reduce the particle yield compared to the case of two infinitely separated fields. If the travel time for a created electron or positron ...
Optical DownConversion In Doped Znse:Tb3+ Nanocrystals, Sandip Das, K. C. Mandal
Optical DownConversion In Doped Znse:Tb3+ Nanocrystals, Sandip Das, K. C. Mandal
Faculty Publications
No abstract provided.
Pair Creation For Bosons In Electric And Magnetic Fields, Q Z. Lv, A C. Su, M Jiang, Rainer Grobe, Qichang Su
Pair Creation For Bosons In Electric And Magnetic Fields, Q Z. Lv, A C. Su, M Jiang, Rainer Grobe, Qichang Su
Faculty publications – Physics
By solving the quantum field theoretical version of the KleinGordon equation numerically, we study the creation process for charged bosonantiboson pairs in static electric and magnetic fields. The fields are perpendicular to each other and spatially localized along the same direction, which permits us to study the crucial impact of the magnetic field's spatial extension on dynamics. If its width is comparable to that of the electric field, we find a magnetically induced Lorentz suppression of the paircreation process. When the width is increased such that the created bosons can revisit the interaction region, we find a region of ...
Suppression Of Pair Creation Due To A Steady Magnetic Field, W Su, M Jiang, Z Q. Lv, Rainer Grobe, Qichang Su
Suppression Of Pair Creation Due To A Steady Magnetic Field, W Su, M Jiang, Z Q. Lv, Rainer Grobe, Qichang Su
Faculty publications – Physics
We investigate the electronpositron pair creation process in a supercritical static electric field in the presence of a static magnetic field that is perpendicular. If both fields vary spatially in one direction the dynamics can be reduced to a set of onedimensional systems. Using a generalized computational quantum field theoretical procedure, we calculate the time dependence of the spatial density for the created electrons. In the presence of the magnetic field, a significant amount of suppression of pair creation is observed in the simulations and confirmed by an analytical analysis for the limits of shortrange fields and long interaction times ...
Pair Creation Enhancement Due To Combined External Fields, M Jiang, W Su, Z Q. Lv, X Lu, Y J. Li, Rainer Grobe, Qichang Su
Pair Creation Enhancement Due To Combined External Fields, M Jiang, W Su, Z Q. Lv, X Lu, Y J. Li, Rainer Grobe, Qichang Su
Faculty publications – Physics
We study the creation of electronpositron pairs from the vacuum induced by a combination of a static electric field and an alternating field. We find that the overall pair production can be increased by two orders of magnitude compared to the yields associated with each field individually. We examine the interesting case where both fields are spatially localized, permitting us to examine the time evolution of the spatial density for the created particle pairs. We find that there are a variety of competing mechanisms that contribute to the total yield.
Local And Nonlocal Spatial Densities In Quantum Field Theory, R E. Wagner, M R. Ware, E V. Stefanovich, Qichang Su, Rainer Grobe
Local And Nonlocal Spatial Densities In Quantum Field Theory, R E. Wagner, M R. Ware, E V. Stefanovich, Qichang Su, Rainer Grobe
Faculty publications – Physics
We use a onedimensional model system to compare the predictions of two different yardsticks to compute the position of a particle from its quantum field theoretical state. Based on the first yardstick (defined by the NewtonWigner position operator), the spatial density can be arbitrarily narrow, and its time evolution is superluminal for short time intervals. Furthermore, two spatially distant particles might be able to interact with each other outside the light cone, which is manifested by an asymmetric spreading of the spatial density. The second yardstick (defined by the quantum field operator) does not permit localized states, and the time ...
Causality And Relativistic Localization In OneDimensional Hamiltonians, R E. Wagner, B T. Shields, M R. Ware, Qichang Su, Rainer Grobe
Causality And Relativistic Localization In OneDimensional Hamiltonians, R E. Wagner, B T. Shields, M R. Ware, Qichang Su, Rainer Grobe
Faculty publications – Physics
We compare the relativistic time evolution of an initially localized quantum particle obtained from the relativistic Schrodinger, the KleinGordon and the Dirac equations. By computing the amount of the spatial probability density that evolves outside the light cone we quantify the amount of causality violation for the relativistic Schrodinger Hamiltonian. We comment on the relationship between quantum field theoretical transition amplitudes, commutators of the fields and their bilinear combinations outside the light cone as indicators of a possible causality violation. We point out the relevance of the relativistic localization problem to this discussion and comment on ideas about the supposed ...
ElectronPositron Pair Creation Induced By QuantumMechanical Tunneling, M Jiang, W Su, X Lu, Z M. Sheng, Y T. Li, J Zhang, Rainer Grobe, Qichang Su
ElectronPositron Pair Creation Induced By QuantumMechanical Tunneling, M Jiang, W Su, X Lu, Z M. Sheng, Y T. Li, J Zhang, Rainer Grobe, Qichang Su
Faculty publications – Physics
We study the creation of electronpositron pairs from the vacuum induced by two spatially displaced static electric fields. The strength and spatial width of each localized field is less than required for pair creation. If, however, the separation between the fields is less than the quantummechanical tunneling length associated with the corresponding quantum scattering system, the system produces a steady flux of electronpositron pairs. We compute the time dependence of the paircreation probability by solving the Dirac equation numerically for various external field sequences. For the special case of two very narrow fields we provide an analytical expression for the ...
BlackbodyRadiation Correction To The Polarizability Of Helium, Mariusz Puchalski, Ulrich D. Jentschura, Peter J. Mohr
BlackbodyRadiation Correction To The Polarizability Of Helium, Mariusz Puchalski, Ulrich D. Jentschura, Peter J. Mohr
Physics Faculty Research & Creative Works
The correction to the polarizability of helium due to blackbody radiation is calculated near room temperature. A precise theoretical determination of the blackbody radiation correction to the polarizability of helium is essential for dielectric gas thermometry and for the determination of the Boltzmann constant. We find that the correction, for not too high temperature, is roughly proportional to a modified hyperpolarizability (twocolor hyperpolarizability), which is different from the ordinary hyperpolarizability of helium. Our explicit calculations provide a definite numerical result for the effect and indicate that the effect of blackbody radiation can be excluded as a limiting factor for dielectric ...
Time Dilation In Relativistic TwoParticle Interactions, B T. Shields, Rainer Grobe, E V. Stefanovich, M R. Ware, Qichang Su, M C. Morris
Time Dilation In Relativistic TwoParticle Interactions, B T. Shields, Rainer Grobe, E V. Stefanovich, M R. Ware, Qichang Su, M C. Morris
Faculty publications – Physics
We study the orbits of two interacting particles described by a fully relativistic classical mechanical Hamiltonian. We use two sets of initial conditions. In the first set (dynamics 1) the system's center of mass is at rest. In the second set (dynamics 2) the center of mass evolves with velocity V. If dynamics 1 is observed from a reference frame moving with velocityV, the principle of relativity requires that all observables must be identical to those of dynamics 2 seen from the laboratory frame. Our numerical simulations demonstrate that kinematic Lorentz spacetime transformations fail to transform particle observables between ...
Characterization Of Pollen Particles Using Lidar, Leda Sox
Characterization Of Pollen Particles Using Lidar, Leda Sox
Graduate Student Posters
We have observed pollen in the local troposphere using the depolarization capabilities of a LIDAR (Light Detection and Ranging) system. The polarization characteristics of the received LIDAR signal, along with supplemental pollen forecast data, allowed me to characterize the shape of the pollen particles.
SpaceTime Properties Of A BosonDressed Fermion For The Yukawa Model, R E. Wagner, M R. Ware, Q Su, Rainer Grobe
SpaceTime Properties Of A BosonDressed Fermion For The Yukawa Model, R E. Wagner, M R. Ware, Q Su, Rainer Grobe
Faculty publications – Physics
We analyze the interaction of fermions and bosons through a onedimensional Yukawa model. We numerically compute the energy eigenstates that represent a physical fermion, which is a superposition of bare fermionic and bosonic eigenstates of the uncoupled Hamiltonian. It turns out that even fast bare fermions require only lowmomentum dressing bosons, which attach themselves to the fast fermion through quantum correlations. We compare the spacetime evolution of a physical fermion with that of its bare counterpart and show the importance of using dressed observables. The time evolution of the center of mass as well as the wave packet's spatial ...
Exponential Enhancement Of FieldInduced Pair Creation From The Bosonic Vacuum, R E. Wagner, M R. Ware, Q Su, Rainer Grobe
Exponential Enhancement Of FieldInduced Pair Creation From The Bosonic Vacuum, R E. Wagner, M R. Ware, Q Su, Rainer Grobe
Faculty publications – Physics
Using numerical solutions to quantum field theory, the creation of bosonantiboson pairs from the vacuum under a very strong localized external electric field is explored. The simulations reveal that the initial linear increase of the number of particles turns into an exponential growth. This selfamplification can be understood as the result of the interaction of the previously generated particles with the creation process. While the number of particles keeps increasing, the spatial shape of the (normalized) charge density of the created particles reaches a universal form that can be related to the bound states of the supercritical potential well. We ...
Bosonic Analog Of The Klein Paradox, R E. Wagner, M R. Ware, Q Su, Rainer Grobe
Bosonic Analog Of The Klein Paradox, R E. Wagner, M R. Ware, Q Su, Rainer Grobe
Faculty publications – Physics
The standard Klein paradox describes how an incoming electron scatters off a supercritical electrostatic barrier that is so strong that it can generate electron positron pairs. This fermionic system has been widely discussed in textbooks to illustrate some of the discrepancies between quantum mechanical and quantum field theoretical descriptions for the pair creation process. We compare the fermionic dynamics with that of the corresponding bosonic system. We point out that the direct counterpart of the Pauli exclusion principle (the central mechanism to resolve the fermionic Klein paradox) is stimulated emission, which leads to the resolution of the analogous bosonic paradox.
Pair Creation Rates For OneDimensional Fermionic And Bosonic Vacua, T Cheng, M R. Ware, Q Su, Rainer Grobe
Pair Creation Rates For OneDimensional Fermionic And Bosonic Vacua, T Cheng, M R. Ware, Q Su, Rainer Grobe
Faculty publications – Physics
We compare the creation rates for particleantiparticle pairs produced by a supercritical force field for fermionic and bosonic model systems. The rates obtained from the Dirac and KleinGordon equations can be computed directly from the quantummechanical transmission coefficients describing the scattering of an incoming particle with the supercritical potential barrier. We provide a unified framework that shows that the bosonic rates can exceed the fermionic ones, as one could expect from the Pauliexclusion principle for the fermion system. This imbalance for small but supercritical forces is associated with the occurrence of negative bosonic transmission coefficients of arbitrary size for the ...
Creation Of Multiple ElectronPositron Pairs In Arbitrary Fields, T Cheng, Q Su, Rainer Grobe
Creation Of Multiple ElectronPositron Pairs In Arbitrary Fields, T Cheng, Q Su, Rainer Grobe
Faculty publications – Physics
We examine the spontaneous breakdown of the matter vacuum triggered by an external force of arbitrary strength and spatial and temporal variations. We derive a nonperturbative framework that permits the computation of the complete time evolution of various multiple electronpositron pair probabilities. These timedependent probabilities can be computed from a generating function as well as from solutions to a set of ratelike equations with coupling constants determined by the singleparticle solutions to the timedependent Dirac equation. This approach might be of relevance to the planned experiments to observe for the first time the laserinduced breakdown process of the vacuum.
Design Of A Wide Bandwidth Switchable Mirror Based On A Liquid Crystal Etalon, EnkhAmgalan Dorjgotov, Philip J. Bos, Achintya Bhowmik
Design Of A Wide Bandwidth Switchable Mirror Based On A Liquid Crystal Etalon, EnkhAmgalan Dorjgotov, Philip J. Bos, Achintya Bhowmik
Chemical Physics Publications
We propose the design for a switchable mirror with high efficiency and a 30 nm bandwidth. The device is based on a liquid crystal filled etalon. Broad bandwidth is achieved through the use of integrated halfwave layers into the dielectric stack design, while high efficiency is achieved using a polarization independent liquid crystal effect. Potential applications in the area of displays are also presented.
Effective Medium Theory, Rough Surfaces, And Moth’S Eyes, David D. Allred, Zephne Larsen, Joseph Muhlestein, R. Steven Turley, Anthony Willey
Effective Medium Theory, Rough Surfaces, And Moth’S Eyes, David D. Allred, Zephne Larsen, Joseph Muhlestein, R. Steven Turley, Anthony Willey
Faculty Publications
Optics in the extreme ultraviolet (XUV) have important applications in microelectronics, microscopy, space physics, and in imaging plasmas. Because of the short wavelengths involved in these applications, it is critical to account for interfacial roughness to accurately predict the reflection and absorption of XUV optics. This paper examines two possible effects of roughness on optical absorption, nonspecular reflection and enhanced transmission and compares these to measured experimental data on a rough Y2O3 thin film.
Limitations Of DecompositionBased Imaging Of Longitudinal Absorber Configurations, S D. Campbell, S D. Grobe, I L. Goodin, Q Su, Rainer Grobe
Limitations Of DecompositionBased Imaging Of Longitudinal Absorber Configurations, S D. Campbell, S D. Grobe, I L. Goodin, Q Su, Rainer Grobe
Faculty publications – Physics
We examine theoretically and experimentally an imaging scheme that uses the transverse intensity profile of the scattered light to reconstruct the locations of absorbers embedded in a turbid medium. This method is based on an a priori knowledge of the scattered light patterns associated with a single absorber that is located at various positions inside the medium. We discuss the range of validity of this method, and its sensitivity with regard to noise, and propose an algorithm to improve its accuracy.
DecompositionBased Recovery Of Absorbers In Turbid Media, S D. Campbell, I L. Goodin, S D. Grobe, Qichang Su, Rainer Grobe
DecompositionBased Recovery Of Absorbers In Turbid Media, S D. Campbell, I L. Goodin, S D. Grobe, Qichang Su, Rainer Grobe
Faculty publications – Physics
We suggest that the concept of the pointspread function traditionally used to predict the blurred image pattern of various light sources embedded inside turbid media can be generalized under certain conditions to predict also the presence and location of spatially localized absorbing inhomogeneities based on shadow pointspread functions associated with each localized absorber in the medium. The combined image obtained from several absorbers can then be decomposed approximately into the arithmetic sums of these individual shadow pointspread functions with suitable weights that can be obtained from multipleregression analysis. This technique permits the reconstruction of the location of absorbers.