Questions tagged [optical-materials]
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Is X-Ray-Emission-Containing Phosphorescence possible or is it limited to Immediate-Emission XRF?
This was a random thought that I wanted to follow up on. I know some materials can take in and kick out X-Rays in XRF (Though most x-ray scintillators tend to emit mostly visible light, not x-rays). ...
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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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Material that Increases Angle of Incoming Light
Snell's law states that light refracts when entering a substance and refracts back to its original angle upon exit. This is shown in the diagram below from this webpage.
I was wondering if there are ...
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Deriving dispersion relation of hyperbolic material
I am trying to derive the following form of the dispersion relation for hyperbolic material:
From the literature, this dispersion relation is achieved by setting the determinant of the below matrix ...
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Could a transparent frequency-altering material be possible?
I would imagine a material that is transparent but a electromagnetic wave going out will have a lower frequency than when going in (and maintaining it's direction). You could build glasses to see UV-...
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Can an optical medium be lossless and dispersive?
Occasionally, I come across the phrase "lossless dispersive linear optical medium". How can such a medium be possible mathematically? I mean the real and imaginary parts of the electric ...
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Second Harmonic Generation on chiral surfaces
I try to recreate a fit in this paper on SHG on chiral surfaces.
I guess the question itself is too specific to get an answer, so I state these questions that are a bit more to the point (and leave my ...
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What percentage of light gets scattered by a mirror?
Sunlight strikes a mirror at a 45 degree angle. The vast majority of light will be reflected about the normal. Some light will be absorbed by the mirror. Some light will be transmitted through the ...
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Light splitting plastic film in phone display screen
I was recently taking apart a button-press phone (like this one) and right under the glass protective screen was a thin plastic film.
This is what happens when I place it over a single dot:
As far ...
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Mixed configuration of magneto-optical kerr effect
Typically there are three types of magneto-optical Kerr effect experiments: Polar, longitudinal, and transverse. These three geometries yield very different results regarding what is measured (...
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How are 3 Principle Sections possible in a crystal even when there is only one optical axis and all must contain it?
While studying polarization in calcite crystals, I came across that there are 3 possible principle sections in the rhombohedral crystal. But the conditions are that each section must be perpendicular ...
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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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Why can you not create a LED equivalent by illuminating a colored plastic casing?
I would first like to apologize if this is a dumb question.
I understand the physics of color sufficiently well. You have an incoming photon that intercepts an electron on the atom, the electron gets ...
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Imaginary part of permittivity tensor
For a general permittivity tensor, why is the imaginary part of the off-diagonal component, e.g.:
$$\epsilon_{xy}$$
equal to:
$$\frac{\epsilon_{xy} + \epsilon_{yx}^*}{2i}$$
instead of:
$$(\epsilon_{xy}...
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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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