All Questions
Tagged with refraction optical-materials
37
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What is meant by optical density?
I’m trying to research about optical density for a school task, but the definitions online are confusing me.
From what I’ve gotten, optical density is:
how much the intensity of light is increased or ...
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How can a greater than 1 reflectance coefficient be explained in $\rm SiC$-$\rm SiO_2$ interface?
I ran a simulation using the Transfer Matrix Method to plot the R,T and A curves for a SiC->SiO2 interface. There's a region of incident energies where the |r|^2 I get is higher than 1 and the ...
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Refraction and Snell's law at $\rm SiN$ inverse taper facet
For an optical inverse taper, for example, for a $\rm SiN$ taper, material of core is $\rm Si_3N_4$ while cladding is oxide. At the facet, there is a polish angle theta to reduce the backreflection. ...
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Do mirrors (with metal surfaces) show TIR (Total Internal Reflection)?
[Not a duplicate! Also, the answer to a similar question was unsatisfactory]
I was digging into why we don't use mirrors in place of fibre optics cables. Majorly, the answers were as follows:
It's ...
- 153
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1
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684
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How do optical fibres work with high critical angles?
The critical angle is given by:
c = arcsin(n2 - n1)
For a typical optical fibre, it says on the web that refractive index (n2) for cladding is higher than that of the glass core (n1) but it's only a ...
- 153
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146
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What are some liquids with high ranges of refractive index with change in temperature?
I need to run an experiment on the effect of temperature on refractive index of a liquid, and in order to make the change most visible and have the lowest percent uncertainty I need the change in ...
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462
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Brewster's angle for Metal?
As metal has a high refraction index, it is possible to have Brewster's Angle for Metal when the light incident from the air? Is it possible to derive from any formula?
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How does reflectance change with wavelength? [duplicate]
Sorry if this is an easy question, I am new to physics and this field.
I have a question about reflectance which i believe to be "effectiveness of reflecting radiating energy"
My goal is to ...
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Non-dispersive mediums for light
Apart from the vacuum are there other mediums for which light velocity does not depend on frequency?
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149
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What can be the possible causes for variation in stress-induced birefringence in an isotropic material?
Birefringence is the phenomenon of a material having a refractive index that depends on the polarization and propagation direction of light. When an unpolarized light passes through such a material, ...
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5
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Variations in Refractive Index of Materials
It's quite a common fact that different types of glass have different refractive indices. Most sites I've found attribute these differences to variations in the 'density' of the glass, which is not ...
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Obtaining both relative permittivity and permeability from refractive index
The complex refractive index $\tilde{n}$ is related to the relative electric permittivity and the magnetic permeability with the relation
\begin{equation}
\tilde{n} = n + \mathrm{i} k= \sqrt{\...
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4
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How can the speed of light in matter be measured?
Experiments such as Focault's measure speed of light in matter. Focault's experimental set-up is based on the idea that it takes more time for light to travel through matter, which will result in the ...
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How to control the refractive index of semiconductors?
I keep seeing/hearing that the refractive index can be controlled in semiconductors, but every time I read something like that it's always something very specific, like "Refractive index ...
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Why does $\rm TiO_2$ require less thickness for thin-film interference than light wavelength suggests?
TL;DR: Why does titanium oxide layer produce visible thin-film interference at thicknesses 10x smaller than the wavelengths of light?
Background:
I am currently trying to model thin film interference ...
