The Effect of Polarized Light on the Absorption Spectrum of the Neodymium Ion in Crystals

1942 ◽  
Vol 62 (1-2) ◽  
pp. 82-82 ◽  
Author(s):  
E. L. Kinsey ◽  
Robert W. Krueger
Keyword(s):  
Absorption Spectrum ◽  
Polarized Light ◽  
Neodymium Ion

Oriented Polymer/Metal Nanocomposites: A New Method for the Production of Polarization Dependent Color Filters

1999 ◽  
Vol 559 ◽  
Author(s):  
Yvo Dirix ◽  
Cees Bastiaansen ◽  
Walter Caseri ◽  
Paul Smith
Keyword(s):  
Absorption Spectrum ◽  
Ostwald Ripening ◽  
Incident Light ◽  
Polarized Light ◽  
Nanocomposite Films ◽  
Color Filter ◽  
Vibration Direction ◽  
Aspect Ratios ◽  
Linearly Polarized ◽  
Set Up

ABSTRACTUniaxially oriented composites of high-density polyethylene and silver nanoparticles were prepared using solution-casting, melt-extrusion and solid-state drawing techniques. The absorption spectrum in the visible wavelength range of the drawn nanocomposites was observed to strongly depend on the polarization direction of the incident light. For instance, the nanocomposites appear bright yellow or red when the vibration direction of linearly polarized light is perpendicular or parallel, respectively, to the drawing axis. The optical anisotropy of the drawn nanocomposites originates from uniaxially oriented, pearl-necklace type of arrays of nanoparticles of high aspect ratios. The absorption spectrum of the nanocomposites can be shifted to higher wavelengths using appropriate annealing procedures. The annealing results in an increased size of the primary silver particles, due to Ostwald ripening, and consequently a range of polarization-dependent colors can be generated in the drawn nanocomposites. It is suggested that the drawn nanocomposite films can be used in liquid crystal displays (LCD's) were they serve a dual purpose in combining polarization filter and color filter. The new display configuration transmits colored light in both the on- and off-state of the device, this in contrast to a conventional color LCD which only transmits colored light in the off-state. As a consequence, an enhanced brightness and light (energy) efficiency of the new display set-up is envisioned.

Near ultra-violet absorption spectrum of crystalline benzoxazole in polarized light

1971 ◽  
Vol 67 ◽  
pp. 2841 ◽  
Author(s):  
Aldo Brillante ◽  
Carlo Taliani ◽  
Carlo Zauli
Keyword(s):  
Absorption Spectrum ◽  
Polarized Light ◽  
Ultra Violet

scholarly journals THE ABSORPTION SPECTRUM AND QUANTUM STATES OF NEODYMIUM ION (Nd3+) IN SINGLE CRYSTAL OF ANHYDROUS NEODYMIUM CHLORIDE AND ANHYDROUS PRASEDYMIUM CHLORIDE

1980 ◽  
Vol 29 (5) ◽  
pp. 602
Author(s):  
SONG ZENG-FU ◽  
ZHANG HE-YI ◽  
XU YAO-ZHOU ◽  
LUO ZHEN-JI ◽  
JIAN HONG-ZHONG ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Single Crystal ◽  
Quantum States ◽  
Neodymium Chloride ◽  
Neodymium Ion

Spectroscopic studies of trans -l,6-diphenyl-1,3,5-hexatriene in ordered liquid crystal solutions

1973 ◽  
Vol 335 (1602) ◽  
pp. 387-405 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Liquid Crystal ◽  
Fluorescence Polarization ◽  
Polarized Light ◽  
Spectroscopic Studies ◽  
Main Axis ◽  
Electronic Transitions ◽  
Absorption Data ◽  
Fluorescence Methods ◽  
Crystal Mixture

A detailed study has been made of the absorption spectrum of all trans-1,6 diphenyl-1,3,5- hexatriene dissolved in a nematic liquid crystal mixture (1.95:1 cholesteryl chloride and cholestryl laurate (by mass)) using polarized light. Apart from two transitions with moments directed along the molecular axis a transition between these two perpendicular to the main axis has been discovered. This is attributed to a 1A -1G transition, predicted by theory. The application of ordered system s to the resolution of transitions in the absorption spectrum has been checked by a comparison with fluorescence polarization methods. A theory has been developed for the treatment of absorption data in ordered media and the effects of distribution of molecular orientations examined. The technique presented is found to be better in several respects than fluorescence methods for identification of electronic transitions.

High Voltage Electron Microscopy of Ion-Milled Dental Enamel

1974 ◽  
Vol 32 ◽  
pp. 60-61
Author(s):  
L. D. Ackerman ◽  
S. H. Y. Wei
Keyword(s):  
Electron Microscopy ◽  
High Voltage ◽  
Third Molar ◽  
Polarized Light ◽  
Dental Enamel ◽  
Longitudinal Section ◽  
Ion Milling ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
High Voltage Electron

Mature human dental enamel has presented investigators with several difficulties in ultramicrotomy of specimens for electron microscopy due to its high degree of mineralization. This study explores the possibility of combining ion-milling and high voltage electron microscopy as a means of circumventing the problems of ultramicrotomy.A longitudinal section of an extracted human third molar was ground to a thickness of about 30 um and polarized light micrographs were taken. The specimen was attached to a single hole grid and thinned by argon-ion bombardment at 15° incidence while rotating at 15 rpm. The beam current in each of two guns was 50 μA with an accelerating voltage of 4 kV. A 20 nm carbon coating was evaporated onto the specimen to prevent an electron charge from building up during electron microscopy.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

High-resolution measurement of birefringent fine structure in living cells using a new polarized light microscope

1995 ◽  
Vol 53 ◽  
pp. 54-55
Author(s):  
Rudolf Oldenbourg
Keyword(s):  
Light Microscope ◽  
Fluorescent Dyes ◽  
Polarized Light ◽  
Processing System ◽  
Video Camera ◽  
Molecular Organization ◽  
Computer Assisted ◽  
Image Recording ◽  
Birefringent Crystal ◽  
Technological Advances

The recent renaissance of the light microsope is fueled in part by technological advances in components on the periphery of the microscope, such as the laser as illumination source, electronic image recording (video), computer assisted image analysis and the biochemistry of fluorescent dyes for labeling specimens. After great progress in these peripheral parts, it seems timely to examine the optics itself and ask how progress in the periphery facilitates the use of new optical components and of new optical designs inside the microscope. Some results of this fruitful reflection are presented in this symposium.We have considered the polarized light microscope, and developed a design that replaces the traditional compensator, typically a birefringent crystal plate, with a precision universal compensator made of two liquid crystal variable retarders. A video camera and digital image processing system provide fast measurements of specimen anisotropy (retardance magnitude and azimuth) at ALL POINTS of the image forming the field of view. The images document fine structural and molecular organization within a thin optical section of the specimen.

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