Transmission Properties of Lower Refractive Index Liquid Filled Hexagon Solid Core PCF

2018 ◽  
pp. 51-63
Author(s):  
Shalini ◽  
Shahiruddin ◽  
Dharmendra Kumar Singh ◽  
M. A. Hassan
Keyword(s):  
Refractive Index ◽  
Solid Core ◽  
Transmission Properties ◽  
Lower Refractive Index

Light microscopy of ceramics

1993 ◽  
Vol 51 ◽  
pp. 908-909
Author(s):  
Walter C. McCrone
Keyword(s):  
Refractive Index ◽  
Light Microscopy ◽  
Light Microscope ◽  
Polarized Light ◽  
Refractive Indices ◽  
Complete Coverage ◽  
The Subject ◽  
Lower Refractive Index

An excellent chapter on this subject by V.D. Fréchette appeared in a book edited by L.L. Hench and R.W. Gould in 1971 (1). That chapter with the references cited there provides a very complete coverage of the subject. I will add a more complete coverage of an important polarized light microscope (PLM) technique developed more recently (2). Dispersion staining is based on refractive index and its variation with wavelength (dispersion of index). A particle of, say almandite, a garnet, has refractive indices of nF = 1.789 nm, nD = 1.780 nm and nC = 1.775 nm. A Cargille refractive index liquid having nD = 1.780 nm will have nF = 1.810 and nC = 1.768 nm. Almandite grains will disappear in that liquid when observed with a beam of 589 nm light (D-line), but it will have a lower refractive index than that liquid with 486 nm light (F-line), and a higher index than that liquid with 656 nm light (C-line).

scholarly journals Образование акцепторных центров в CdHgTe под воздействием воды и термообработок

2021 ◽  
Vol 55 (4) ◽  
pp. 331
Author(s):  
Г.Ю. Сидоров ◽  
Ю.Г. Сидоров ◽  
В.А. Швец ◽  
В.С. Варавин
Keyword(s):  
Refractive Index ◽  
Water Treatment ◽  
Epitaxial Films ◽  
Heat Treatments ◽  
Deionized Water ◽  
Native Oxide ◽  
Water Medium ◽  
Native Oxide Layer ◽  
Formation Heat ◽  
Lower Refractive Index

Influence storage and boiling in deionized water and heat treatments of epitaxial films CdxHg1-xTe on the Hall and ellipsometric parametres is investigated. Water treatment reduces refractive index of native CdxHg1-xTe oxide from 2.1 to 1.2-1.4. It means that matter with a lower refractive index, such as water, is introduced in the oxide. Boiling in water leads to formation of acceptors in CdxHg1-xTe with concentrations up to 1019 cm-3. Change of medium’s pH from alkaline to the acidic decreases the speed of acceptors formation. Heat treatments after storage in water also leads to formation of acceptors. The conclusion is made, that water medium or water absorbed by native oxide layer leads to formation of acceptors in CdxHg1-xTe. Concentration of acceptors grows with temperature of treatments and quantity of accessible water.

Controlling Thermoplastic Elastomer Optical Properties by Mechanical Processing

MRS Advances ◽  
2019 ◽  
Vol 4 (23) ◽  
pp. 1341-1347 ◽  
Author(s):  
Margaret Campbell ◽  
Paramjot Singh ◽  
Kunal Kate ◽  
Cindy K. Harnett
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Optical Transmission ◽  
Thermoplastic Elastomer ◽  
Mechanical Processing ◽  
Sensor Signal ◽  
Extrusion Speed ◽  
The Core ◽  
Lower Refractive Index ◽  
Urethane Elastomer

ABSTRACTWe demonstrate that the extrusion speed of thermoplastic urethane elastomer can modify its optical transmission by a factor of more than 100. Varying extrusion speed at constant temperature may tune optical properties along the axis of a filament, for example creating absorbent regions that are sensitive to length and diameter changes, surrounded by more transmissive segments that carry the sensor signal over long distances. Such waveguiding in a stretchable optical fiber requires a stretchable cladding with lower refractive index than the core. In experiments toward a rugged, stretchable fiber cladding, we investigated whether solvents could modify the outer structure of the filaments. Soaking the filaments in NMP (n-methyl-2-pyrrolidone), then stretching the filaments while the solvent dried, turned out to modify the filaments in a way that solvents alone did not, creating porosity and reducing the appearance of optical clarity.

Investigations into a new stratified hyperbolic profile

1967 ◽  
Vol 63 (2) ◽  
pp. 439-450 ◽  
Author(s):  
John Heading
Keyword(s):  
Refractive Index ◽  
Free Space ◽  
Refractive Index Profile ◽  
Analytical Evaluation ◽  
Index Profile ◽  
Transmission Properties ◽  
Symmetrical Form ◽  
Space Conditions

AbstractThe symmetrical Epstein refractive index profile (with free space conditions on each side of the transition) is generalized to a non-symmetrical form including both a barrier and a well by the discovery of a profile that cannot be obtained from the standard Epstein profile merely by adjusting the parameters. The analytical evaluation of the reflexion and transmission properties of the model is more complicated than that which occurs in the study of the Epstein profile.

SiO2 and TiO2 Sol-Gel Blends with Tunable Optical and Electronic Properties

MRS Advances ◽  
2019 ◽  
Vol 4 (11-12) ◽  
pp. 689-695
Author(s):  
Stephanie Arouh ◽  
Roland Himmelhuber ◽  
Robert A. Norwood
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
Initial Mixture ◽  
High Refractive Index ◽  
Dielectric Constants ◽  
Glass Substrates ◽  
Optical And Electronic Properties ◽  
Tio2 Sol ◽  
Coating Method ◽  
Lower Refractive Index

Sol-gel blends are created using a combination of a high refractive index (n∼2.4) TiO2 based sol-gel and a low refractive index (n∼1.5) SiO2 based sol-gel. The blends are prepared with different ratios of sol-gels and films are created using the spin coating method on silicon and ITO-on-glass substrates. The film thickness, refractive index, and dielectric constants of the resulting films are measured using profilometry, prism coupling, and LCR measurements, respectively. Results show that including more SiO2 based sol-gel in the initial mixture creates thicker films ranging from 1-7 μm, but results in lower refractive index and lower dielectric constants. This is consistent with expectations due to SiO2 having a lower refractive index and dielectric constant than titania over a range of wavelengths andfrequencies. The ability to fine tune the properties is explored.

IMMERSION REFRACTOMETRY OF SOME HALOPHILIC BACTERIA

1960 ◽  
Vol 6 (1) ◽  
pp. 9-15 ◽  
Author(s):  
John I. Payne ◽  
S. N. Sehgal ◽  
N. E. Gibbons
Keyword(s):  
Refractive Index ◽  
Water Content ◽  
Inclusion Bodies ◽  
Halophilic Bacteria ◽  
Salt Content ◽  
Solid Content ◽  
Extreme Halophiles ◽  
Lower Refractive Index

The solid content of several halophilic bacteria was estimated by immersion refractometry. Values for extreme halophiles ranged from 28 to 32%, and for moderate halophiles from 31 to 45%. The solid content of these organisms changed with variation in the salt content of the environment. It is thought that these differences are the result of changes in the water content of the cell. Spheres (spheroplasts) had a slightly lower solid content than the parent rods. Nuclear and other inclusion bodies, mostly of lower refractive index than the cytoplasm, were noted.

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