Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 124 for “"polarized light"”.
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Fabrication Methods for Polarized Light Collages
… we discuss the best methods of fabricating polarized art collages, inspired by the artwork of Austine Wood-Comarow that creates brightly colored images from cellophane, a colorless birefringent material, placed in between two polarizers. Her artwork appears alive as the colors morph between …
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Planetary Systems in Polarized Light: Debris Disk Observations and Instrumentation
Understanding planet formation is one of the major challenges of modern astronomy. Polarimetry is a powerful tool with which we can confront this challenge. In particular, polarimetric observations can be useful for imaging debris disks and characterizing exoplanet atmospheres. With that in mind, …
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Designing and Fabricating Polarized Light Mosaics with User-Defined Color-Changing Behaviors
Polarized light mosaics are color-changing structures that alter their appearance based on the orientation of incident polarized light. While artists have developed techniques for crafting polarized light mosaics by hand, there exists no design tool and fabrication process that allows makers to …
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A study of the interference of polarized light by the method of coherency matrices
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1930.
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Determining the Air Void Parameters of Concrete Using Digital Image Analysis of Polarized Light Micrographs
The ASTM C457 test has long been a standard used to obtain the air void parameters of concrete materials. These air void parameters provide valuable information that has been linked to the performance of concrete under conditions such as freezing and thawing cycles. The standard test procedure …
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Conformational Dynamics of the Nuclear Pore Complex Studied With Coarse-Grained Modelling and Polarized Light Microscopy
… (NPC) through coarse-grained modelling and polarized-total internal reflection fluorescence (pol-TIRF) microscopy. The NPC is a large (~120 MDa in humans) macromolecular assembly that controls the flow of molecules into and out of the nucleus. The NPC is a key regulator of intracellular …
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Validation of angle-resolved polarized light scattering spectroscopy as a diagnostic tool for pre-cancer detection
Light scattering spectroscopy has emerged as a valuable diagnostic tool for cancer diagnoses in the past ten years. The interaction of light with cellular structures brings out information about morphological changes accompanying malignancy at early stages. The virtue of this technique is to …
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Study of force discrimination on chiral molecules and particles by circular polarized light and metasurface enhanced field
… These fields come from incident circular polarized light or from enhanced fields generated by a plasmonic metasurface. This topic was first motivated by the need of separating enantiomers mechanically. Now many works have been done by different groups. Inspired by these works, a general …
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Polarized Light Microscopy and Image Processing as a Near Real-time Monitoring Tool for Coal Mine Dust Monitoring
… intensity thresholds under plane- and cross-polarized lighting conditions. The results demonstrated the method's potential to support dust source apportionment, thereby informing exposure mitigation strategies and operational decision-making. Particle size and loading density were identified …
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Breaking symmetries in ordered materials : spin polarized light transport in magnetized noncentrosymmetric 1D photonic crystals, and photonic gaps and fabrication of quasiperiodic structured materials from interference lithography
… air-crystal interface, ability to allow bending light with perpendicular magnetic fields, unidirectional superprism effects, etc. By calculating the complex photonic band structure, we show that the gap modes differ fundamentally from the commonly assumed evanescent modes with purely imaginary …
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Synthesis and Application of Well-Defined Stimuli Responsive Materials
… The material's physical response to plane polarized light was studied in thin films and latex particles. Relief gratings were fabricated in a single step via proximity field nanopatterning which provided interesting surface structured materials without the need for development or post …
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Two-dimensional reflectivity polarization elastometry imaging techniques (PIET) of soft tissue
A non-invasive polarized light reflection measurement method to measure the stretch of soft tissue, such as skin, is described. The technique utilizes changes in the reflectivity of polarized light intensity as a monitor of skin stretch. Measurements on in-vitro pigskin and invivo human skin show …
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Controlling the sense of molecular chirality with light: Toward a liquid crystal optical switch
… concept is based on control of chirality with light, a light-induced switching of the stereochemistry of a chiral molecule. This can be done in one of the two ways: photoresolution of a racemate by circularly polarized light based on circular dichroism of chiral compounds and chirochromism, a …
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Crosstalk and noise in division-of-focal-plane polarimeters and polarization imaging applications
… for biomedical applications using quantitative polarized light imaging. Also discussed is modeling for underwater geolocalization based upon polarized light fields.
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Polarization in the Sunyaev-Zeldovich effect
… the transfer and Compton scattering of partially polarized light is presented. In this approach, the polarization state of a light beam is described by a tensor constructed from the time average of quadratic products of the electric field components in a local observer frame. This leads naturally …
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A fiber optic polarimeter for use in chemical analysis
… chemical species will rotate incident linearly polarized light. Although well developed for physical sensing, the technique of fiber optic polarimetry for chemical sensing remains in its infancy. This thesis is concerned with the design and development of an optical fiber polarimeter which …
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Surface Reflectance Core Spectroscopy of Halogens, Rare Gases, Alkalis and Carbon-Monoxide on Metal Surfaces
… energy range from 4 to 20 eV, using both s and p polarized light. Results for adsorbates in three neighboring columns of the Periodic Table principally reveal charge transfer processes and properties of the impurity surface complex.
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Morphological studies of polymeric systems with liquid crystalline order
… magnetic, and flow fields and interact with polarized light such that they are desirable materials for display devices. Additionally, these systems are all polymeric, lending the complexity of the molecules' long-chain nature to the material properties, and the resulting processing challenges …
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Genetic algorithm gradient ascent (GAGA) optimization of compact symmetry-breaking photonic crystals
… does not require gratings or prisms to couple light, a genetic algorithm (GA) was used to maximize nonreciprocity in the design globally, followed by the application of the numerical gradient ascent (GAGA) algorithm as a local optimization to further enhance the design. The first absorber …
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Part I: Self-Assembling Dendrimers Using the Dda-Aad Hydrogen Bonding Motif. Part II: Supramolecular Discotic Liquid Crystals Through Hydrogen Bond Mediated Self-Assembly
… by differential scanning calorimetry (DSC), polarized light microscopy (PLM) and X-ray diffraction (XRD) indicate that the hexameric disks can stack in bulk to form thermotropic columnar mesophases. The mesophases exist across a large temperature range (>248°C).
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