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Showing 1 to 18 of 18 for “"Optical Polarization"”.
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Imaging 3D tissue fiber organization using optical polarization tractography
Optical polarization tractography (OPT) is a new imaging technology developed based on an advanced Jones matrix implementation of polarization-sensitive optical coherence tomography (PSOCT). OPT can acquire high-resolution, three-dimensional (3D), depth-resolved images of fiber organization in …
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THE OPTICAL POLARIZATION OF QUASI-STELLAR AND BL LACERTAE OBJECTS
In this dissertation, I examine the optical linear polarization of quasi-stellar objects (QSOs) and BL Lacertae objects. I present extensive polarimetric observations of a large sample of QSOs, systematically analyze the correlations between polarization and other properties of QSOs, compare t
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The optical polarization variability of the blazar PKS 2155 304
… quiescent states. In this thesis I make use of optical polarization and multiwavelength observations across roughly 5.5 years to probe the source variability on short (intra-day to daily), intermediate (days to months) and long timescales (months to years). The polarization, as a direct …
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A study of superconducting domain structures using optical polarization techniques.
Thesis: M.S., Massachusetts Institute of Technology, Department of Physics, 1965
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Optical polarization control in free space and through random media using wavefront shaping
Light is widely used in areas such as optical communications, micro/nano fabrication, industrial process control, material characterization, and biomedical imaging. The usefulness of light in these areas depends on the dexterity with which the state of the optical field, defined by the …
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Optical Polarization Studies Of Latex Beads In Aqueous Solution: An Analog For Radar Scattering In Water-Ice Medium
… and opposite sense (OC) backscatter circular polarization coefficients, circular polarization ratio (CPR), and degree of linear polarization (DLP) of spherical latex (non-dye) beads of varying sizes and volume concentrations (v/v) in aqueous solutions (λ=0.8μm) in water. We leverage Mie …
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Polarization Controlled Coherent Anti-Stokes Raman Scattering Microscopy for Determination of Structural Order of the Myelin Sheath
… aligned parallel to the axis of the nerve. The optical polarization dependence of the CARS signal can be used to probe the orientation of CH2 bonds in the sheath and determine their nanoscopic orientation. As myelin becomes unhealthy the organization of the lipids begins to loosen from their …
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Polarization-dependent wavelength-selective structures for multispectral polarimetric infrared imaging
… solution in which the spectral filtering and polarization filtering functions are performed in a single component. In this work, single-layer and double-layer metallic-grating structures, embedded in uniform dielectric are investigated. Spectral tunability using only transverse grating …
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Atomic quantum memory for photon polarization
Using an ensemble of ultracold Cesium atoms in an optical cavity we demonstrate the efficient storage and retrieval of quantum information in the form of single photons. We use a photon that has scattered into the cavity mode to herald a successful creation of a collective excitation of Cesium …
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Wide-field magnetic field imaging with nitrogen vacancy centers in nanodiamonds at high frame-rates
… a promising single spin system in diamond with optical polarization, readout and optically detected magnetic resonances (ODMR). The NV has been shown to be a sensitive magnetometer at room temperature. In particular, owing to their small size, NV centers in nanocrystals (nanodiamonds) offer …
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Tune-out Wavelength Measurement and Gyroscope Using Dispersion Compensation in an Atom Interferometer
… nm. To reach sub-picometer precision, an optical cavity surrounding the atom beam paths of the interferometer was used. Although this improved the precision of our experiment by increasing the light-induced phase shifts, the cavity also brought several systematic errors to our attentions. …
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Effects of Cross-Correlation Interference on an Optical Code Division Multiple Access Communication System
… fading on the error rate performance of an optical code division multiple access communication system are investigated. The system model is a multiaccess satellite repeater in which user separation is accomplished by direct sequence modulation. The analysis is for direct detection, optical …
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High throughput 3D optical microscopy : from image cytometry to endomicroscopy
Optical microscopy is an imaging technique that allows morphological mapping of intracellular structures with submicron resolution. More importantly, optical microscopy is a technique that can readily provide images with biochemical contrast based on different spectroscopic modalities such as …
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Magnetic Microstructure and Actuation Dynamics of NiMnGa Magnetic Shape Memory Materials
… for future possible devices. In this work, optical polarization microscopy is applied to investigate the twin boundary and magnetic domain wall motion in bulk NiMnGa single crystals. Surface magnetic domain patterns on adjacent sides of bulk crystals are revealed for the first time providing …
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The Bio-Nano Interface: Investigating the Roles of Nanoparticle Morphology, Microstructure, Optoelectronic Properties, and Surface Chemistry for Biological Applications
… effect, these materials have highly tunable optical and electronic properties that depend on the nanocrystal size, shape, and composition. Because of these properties, QDs are potentially useful for applications such as LEDs, lasers, in-vivo and in-vitro imaging, and other sensing …
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Coherency matrices for characterization of vector optical fields
We describe optical coherency matrices as a generalized method for characterizing the statistical properties of optical fields. We then use this formalism to classify optical fields, in terms of separability, and transfer of entropy between multiple degrees of freedom.
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Polarization multiplexed photonic integrated circuits for 100 Gbit/s and beyond
In this thesis, a fully integrated dual-polarization (DP) optical transmitter is proposed, developed and demonstrated. The transmitter proposed in this work consists of two key building blocks: a polarization rotator (PR) and two electro-absorption modulators (EAM), laid out in a serial …
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Plasmonic nanoantennas for multipurpose particle manipulation and enhanced optical magnetism
Optical manipulation – using light to control matter – is based on the transfer of momentum from confined electromagnetic fields to micro- and nanoscale objects. Optical tweezers, based on the use of high-numerical aperture objective lenses, take advantage of this phenomenon to form non-contact …