Symmetries, Zero Modes And Light Transport In Non-Hermitian Photonics, 2022 The Graduate Center, City University of New York
Symmetries, Zero Modes And Light Transport In Non-Hermitian Photonics, Jose David Hernandez Rivero
Dissertations, Theses, and Capstone Projects
We approach some fundamental aspects of photonic dissipative systems treated by a non-Hermitian theory. Inspired by the possibilities provided by some major non-Hermitian symmetries, we study systematically the properties of the novel pseudochirality, pseudo-anti-Hermiticity, and supersymmetry. We analyze other aspect of photonics, the zero mode, which has a profound connection to non-Hermitian physics. We propose a scheme to realize a zero mode that exists even in the absence of symmetries. Finally, we approach light transport in non-Hermitian photonic systems, where the introduction of gain and loss can modify drastically the propagation speed of wavepackets.
Contributions Of Vibrational Spectroscopy To Virology: A Review, 2022 Technological University Dublin
Contributions Of Vibrational Spectroscopy To Virology: A Review, Iqra Chaudhary, Naomi Jackson, Denise Denning, Luke O'Neill, Hugh Byrne
Vibrational spectroscopic techniques, both infrared absorption and Raman scattering, are high precision, label free analytical techniques which have found applications in fields as diverse as analytical chemistry, pharmacology, forensics and archeometrics and, in recent times, have attracted increasing attention for biomedical applications. As analytical techniques, they have been applied to the characterisation of viruses as early as the 1970s, and, in the context of the coronavirus disease 2019 (COVID-19) pandemic, have been explored in response to the World Health Organisation as novel methodologies to aid in the global efforts to implement and improve rapid screening of viral infection. This review ...
Lifetime Measurement Of The Xi_C^+ Using Belle Ii Monte Carlo, 2022 University of Mississippi
Lifetime Measurement Of The Xi_C^+ Using Belle Ii Monte Carlo, Paul Gebeline
This analysis uses simulated data from the Belle II experiment to measure the lifetime of the Xi_c^+ baryon. Three different decay modes are investigated to explore the feasibility and accuracy of such measurements at Belle II. The Xi_c^+ lifetime is measured using one of these modes after reducing backgrounds from sources other than the decay of interest. The final result is 464 +/- 15 fs, which is consistent with the expected result of 442 fs within uncertainty. This result shows that Belle II can make competitive measurements of particle properties and decays.
Structural And Spectroscopic Analysis For Silver Bulk And Nanoparticles, 2022 Department of Applied Science, University of Technology, Baghdad, Iraq.
Structural And Spectroscopic Analysis For Silver Bulk And Nanoparticles, Hajir M. Fadhil, Khaleel I. Hassoon, Hyder A. Salih
Karbala International Journal of Modern Science
In this research work, a pulsed Nd-YْAG laser having a wavelength of 1064 nm and energy (400-700 mJ (has been utilized as a source in an induced breakdown spectroscopy (LIBS) experiment to determine the density of electron and the tem-perature of Ag-plasma. Two forms of silver (as a bulk and as a compressed nano powder) have been used as targets in the LIBSs setup. The aim of the present work is to study the impact of target properties and laser energy on the plasma fea-tures formed by the interaction between a pulsed laser and these two forms of silver ...
An Atomic Magnetometer Based On Nonlinear Magneto-Optical Polarization Rotation, 2022 William & Mary
An Atomic Magnetometer Based On Nonlinear Magneto-Optical Polarization Rotation, Jiahui Li
Undergraduate Honors Theses
Magnetometers with high precision and accuracy have wide applications across various areas. We are developing an atomic magnetometer based on nonlinear magneto-optical rotation (NMOR). The magnetometer measures the polarization rotation of a light field, which is proportional to the magnetic field strength. However, such a magnetometer usually has a limited operation range and stops working for fields stronger than the Earth's magnetic field. To overcome this shortage, we implement frequency and amplitude modulation that induces side frequencies in the Fourier space which allows us to measure strong magnetic fields, up to 200 mG. We have achieved 60 pT sensitivity ...
Development Of A Vector Magnetometer Based On Electromagnetically Induced Transparency In 87rb Atomic Vapor, Alexander Toyryla
Undergraduate Honors Theses
We present progress towards the development of an atomic magnetometer capable of accurate scalar and vector magnetic field measurements with high sensitivity and no need for external calibration. The proposed device will use the interaction between a bi-chromatic laser field and rubidium vapor to derive magnetic field magnitude and direction from measured amplitudes of Electromagnetically Induced Transparency (EIT) resonances. Since the proposed method requires precision control of light polarization, we observe the performance capabilities of a liquid crystal device to dynamically rotate the polarization of the laser field. Another goal in this project is to establish a polarization locking mechanism ...
Alkali Linewidths Under High Temperatures And Pressures Of 3he, 2022 William & Mary
Alkali Linewidths Under High Temperatures And Pressures Of 3he, Michael Parker
Undergraduate Honors Theses
Current research at Thomas Jefferson National Accelerator Facility is being conducted to study the spin structure of the neutron through collisions with polarized 3He nuclei. The helium is contained in high pressure glass vessels (called cells) along with nitrogen, rubidium, and potassium. To deduce the spin structure from collisions, we need to know the precise number density of 3He in the cell. The process of polarizing 3He through spin-exchange optical pumping requires nitrogen and alkali metal. We can use the absorption linewidths of rubidium and potassium to more accurately determine the density of helium. Throughout my research, I collected absorption ...
Co-Planar Waveguides For Microwave Atom Chips, 2022 William & Mary
Co-Planar Waveguides For Microwave Atom Chips, Morgan Logsdon
Undergraduate Honors Theses
This thesis describes research to develop co-planar waveguides (CPW) for coupling microwaves from mm-scale coaxial cables into 50 μm-scale microstrip transmission lines of a microwave atom chip. This new atom chip confines and manipulates atoms using spin-specific microwave AC Zeeman potentials and is particularly well suited for trapped atom interferometry. The coaxial-to-microstrip coupler scheme uses a focused CPW (FCPW) that shrinks the microwave field mode while maintaining a constant 50 Ω impedance for optimal power coupling. The FCPW development includes the simulation, design, fabrication, and testing of multiple CPW and microstrip prototypes using aluminum nitride substrates. Notably, the FCPW approach ...
Porous Silicon Photonics For Label-Free Interferometric Biosensing And Flat Optics, 2022 Clemson University
Porous Silicon Photonics For Label-Free Interferometric Biosensing And Flat Optics, Tahmid Hassan Talukdar
This dissertation uses porous silicon as a material platform to explore novel optical effects in three domains: (i) It studies dispersion engineering in integrated waveguides to achieve high performance group index sensing. With proper design parameters, the sensor waveguides can theoretically achieve 6 times larger group index shift compared to the actual bulk effective refractive index shift. We demonstrate the guided mode confinement factor to be a key parameter in design and implementation of these waveguides. (ii) It explores multicolor laser illumination to experimentally demonstrate perceptually enhanced colorimetric sensing, overcoming the limitations faced by many contemporary colorimetric sensors. Our technique ...
Experimental Investigation Of All-Optical Production Of Metastable Krypton, 2022 Old Dominion University
Experimental Investigation Of All-Optical Production Of Metastable Krypton, Joshua Carl Frechem
Physics Theses & Dissertations
Metastable production of noble gases requires significant energy due to their filled valence shells. These transitions from the ground state are in the vacuum ultraviolet and extreme ultraviolet, which are relatively inaccessible to lasers. This necessitates the use of either electron/ion bombardment via inefficient glow discharges or the use of high-power lasers and nonlinear processes. The all-optical production efficiency using these high-power lasers promises to be orders of magnitude higher than glow discharges, but far more costly. This work looks to improve all-optical production of metastable krypton (Kr*) through the use of a commercially available vacuum ultraviolet lamp with ...
Ultrafast Dynamics Of Ir125 And Ir144 Using Femtosecond Coherence Spectroscopy, 2022 California State University, Chico
Ultrafast Dynamics Of Ir125 And Ir144 Using Femtosecond Coherence Spectroscopy, Ryan J. Debord
Undergraduate Theses and Capstone Projects
Transient absorption spectroscopy can resolve ultrafast dynamics that result from photo-initiated processes like photon absorption from a laser. Here we report on the construction of a transient absorption spectrometer and its use to investigate ultrafast dynamics of laser dyes IR-125 and IR-144. Laser dyes are common object of interest for ultrafast dynamics studies because of their use in the creation dye lasers and there application in biomedical fields. Ultrafast decay was observed. The, expected coherent oscillations were present but unclear in the transient absorption measurement due to signal noise(presumably from the sensor). Additionally, we found that our laser produces ...
Dispersion In High Temperature Superconductors, 2022 University of Nevada, Las Vegas
Dispersion In High Temperature Superconductors, Lazar Novakovic
Undergraduate Research Symposium Podium Presentations
Superconductors are used in many different industries: Efficient power transmission, Maglev train, MRIs
Millikan Oil Drop Experiment, 2022 University of Lynchburg
Millikan Oil Drop Experiment, Iran Gandarilla
Undergraduate Theses and Capstone Projects
The experiment we are recreating is the oil drop experiment conducted by Robert A. Millikan in 1910. The purpose of the experiment is to calculate the charge of the electron. This experiment had been done before Millikan, but he used more precise methods for both his observational process and his mathematical analysis. Because of this, the charge of the electron is, of course, known at this point. We also know of the most significant sources of error in this experiment. Namely, the viscosity of air, as it depends on the size of the drop and the pressure inside the ...
Calculation Of The Fundamental Electric Charge With A Millikan Oil Drop Apparatus, 2022 New Mexico Institute of Mining and Technology
Calculation Of The Fundamental Electric Charge With A Millikan Oil Drop Apparatus, Noah Fuge D'Antonio
Undergraduate Theses and Capstone Projects
Using a Millikan oil drop apparatus, information obtained from drops falling at terminal velocity and suspended between capacitor plates can be used to calculate the charge q on a oil drops. Using a large number of drops, we attempt to determine the value of the fundamental electric charge e that best fits the equation q e = n, where n is an integer. By attempting to minimize the square of the non-integer residual for all drops, the best fit value for e obtained was emeasured = (3.8 ± 0.4 ∗ 10−19) C. As the tabulated and defined value of e ...
Physics 516: Electromagnetic Phenomena (Spring 2022), 2022 University of Pennsylvania
Physics 516: Electromagnetic Phenomena (Spring 2022), Philip C. Nelson
Department of Physics Papers
These course notes are made publicly available in the hope that they will be useful. All reports of errata will be gratefully received. I will also be glad to hear from anyone who reads them, whether or not you find errors: email@example.com.
Measurement Of Optical Rubidium Clock Frequency Spanning 65 Days, 2022 Bethel University
Measurement Of Optical Rubidium Clock Frequency Spanning 65 Days, Nathan D. Lemke, Kyle W. Martin, River Beard, Benjamin K. Stuhl, Andrew J. Metcalf, John D. Elgin
Physics and Engineering Faculty Publications
Optical clocks are emerging as next-generation timekeeping devices with technological and scientific use cases. Simplified atomic sources such as vapor cells may offer a straightforward path to field use, but suffer from long-term frequency drifts and environmental sensitivities. Here, we measure a laboratory optical clock based on warm rubidium atoms and find low levels of drift on the month-long timescale. We observe and quantify helium contamination inside the glass vapor cell by gradually removing the helium via a vacuum apparatus. We quantify a drift rate of 4 x 10-15, a 10 day Allan deviation less than 5 x 10 ...
Calculated Charge State Distributions And Anisotropies Following The Β-Decay Of 6he, 2022 University of Windsor
Calculated Charge State Distributions And Anisotropies Following The Β-Decay Of 6he, Eva E. Sculhoff
Electronic Theses and Dissertations
According to the standard model the beta-decay of 6He is a pure Gamow-Teller transition. The aim of this thesis is to provide theoretical support in the search for new physics beyond the standard model by examining the angular distribution of beta particles following decay. The simple structure of 6He, along with its ability to under go beta-decay into 6Li+ makes it an ideal candidate for studying the weak force. Due to the sudden increase in nuclear charge from Z = 2 to Z = 3, and the recoil momentum of the daughter nucleus resulting from the emitted leptons, this decay causes an ...
Atomistic Simulation Of Na+ And Cl- Ions Binding Mechanisms To Tobermorite 14Å As A Model For Alkali Activated Cements, 2022 American University in Cairo
Atomistic Simulation Of Na+ And Cl- Ions Binding Mechanisms To Tobermorite 14Å As A Model For Alkali Activated Cements, Ahmed Abdelkawy
Theses and Dissertations
The production of ordinary Portland cement (OPC) is responsible for ~8% of all man-made CO2 emissions. Unfortunately, due to the continuous increase in the number of construction projects, and since virtually all projects depend on hardened cement from the hydration of OPC as the main binding material, the production of OPC is not expected to decrease. Alkali-activated cement produced from the alkaline activation of byproducts of industries, such as iron and coal industries, or processed clays represents a potential substitute for OPC. However, the interaction of the reaction products of AAC with corrosive ions from the environment, such as Cl- ...
The Hitran2020 Molecular Spectroscopic Database, 2022 Old Dominion University
The Hitran2020 Molecular Spectroscopic Database, I. E. Gordon, L. S. Rothman, R. J. Hargreaves, R. Hashemi, E. V. Karlovets, F. M. Skinner, E. K. Conway, C. Hill, R. V. Kochanov, Y. Tan, P. Wcisło, A.A. Finenko, K. Nelson, P. F. Bernath, M. Birk, V. Boudon, A. Campargue, K. V. Chance, A. Coustenis, B. J. Drouin, J.-M. Flaud, R. R. Gamache, J. T. Hodges, D. Jacquemart, E. J. Mlawer, A. V. Nikitin, V.I. Perevalov, M. Rotger, J. Tennyson, G. C. Toon, H. Tran, V. G. Tyuterev, E. M. Adkins, A. Baker, A. Barbe, E. Canè, A. G. Császár, A. Dudaryonok, O. Egorov, A. J. Fleisher, H. Fleurbaey, A. Foltynowicz, T. Furtenbacher, J. J. Harrison, J.M. Hartmann, V.- M. Horneman, X. Huang, T. Karman, J. Karns, S. Kassi, I. Kleiner, V. Kofman, F. Kwabia-Tchana, N.N. Lavrentieva, T. J. Lee, D. A. Long, A. A. Lukashevskaya, O. M. Lyulin, V. Yu Makhnev, W. Matt, S. T. Massie, M. Melosso, S. N. Mikhailenko, D. Mondelain, H.S.P. Müller, O. V. Naumenko, A. Perrin, O. L. Polyansky, E. Raddaoui, P. L. Raston, Z. D. Reed, M. Rey, C. Richard, R. Tóbiás, I. Sadiek, D. W. Schwenke, E. Starikova, K. Sung, F. Tamassia, S. A. Tashkun, J. Vander Auwera, I.A. Vasilenko, A.A. Vigasin, G.L. Villanueva, B. Vispoel, G. Wagner, A. Yachmenev, S. N. Yurchenko
Chemistry & Biochemistry Faculty Publications
The HITRAN database is a compilation of molecular spectroscopic parameters. It was established in the early 1970s and is used by various computer codes to predict and simulate the transmission and emission of light in gaseous media (with an emphasis on terrestrial and planetary atmospheres). The HITRAN compilation is composed of five major components: the line-by-line spectroscopic parameters required for high-resolution radiative-transfer codes, experimental infrared absorption cross-sections (for molecules where it is not yet feasible for representation in a line-by-line form), collision-induced absorption data, aerosol indices of refraction, and general tables (including partition sums) that apply globally to the data ...
Circulation Transfer Between Adjacent Target Bose-Einstein Condensates, 2022 Georgia Southern University
Circulation Transfer Between Adjacent Target Bose-Einstein Condensates, Charles B. Henry
Honors College Theses
We propose an atomtronic rotation sensor design that consists of an array of Bose-Einstein Condensates (BECs) that are confined in a double-target-array potential. The rotation sensor's purpose is to measure the speed of the rotating frame, with respect to the “fixed stars", the sensor rests in. The atomtronic system is an ultracold gas of sodium atoms that have been compressed by laser light into a thin quasi-2D horizontal plane and further confined in the horizontal plane by a double-target-array potential. A target BEC is a combination of disk BEC that is surrounded by a ring BEC. A double-target BEC ...