# Questions tagged [optical-materials]

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### Is magneto-optic Kerr effect discernible for material with natural optical activity?

Magneto-optic Kerr effect requires a system with internal magnetism or external magnetic field and exhibits, say, circular dichroism for reflection measurements. Natural optical activity can have ...
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### Are there optical materials with larger mean deviation with little to zero angular dispersion?

The following statement is from Concepts of Physics by Dr. H.C.Verma, from the chapter "Dispersion and Spectra", page 434, topic "Dispersive Power": The mean deviation depends on the average ...
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### How to derive the macroscopic dielectric function?

I'm following Matteo Gatti's slides to repeat the derivation of macroscopic dielectric function $\epsilon_M$: $$\epsilon_M=\dfrac{1}{\epsilon^{-1}_{\vec{G}=0,\vec{G}'=0}(\vec{q},\omega)}.$$ On page ...
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### How is water athermanous?

My textbook says that water is an athermanous substance i.e. the type of substance which does not transmit any incident heat radiations. But how is that true since water is transparent, light that is ...
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### Are there elastic materials that are transparent to infrared light?

I am working on a device that I want to be encased in an elastic membrane to allow for articulation and water resistance. This means that all sensors must be inside the membrane. The membrane must ...
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### The numerical aperture of optic fibre and angle of incidence

First My college book contains the following passage: the angle of incidence (relative to the fibre axis ) can't be too large else the ray would be refracting on the core\cladding boundary and ...
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### What material absorb IR and let visible light through? [closed]

Beside water, what common materials -- man made or otherwise -- absorb infrared (~800nm-~1100nm) and let visible light through? I think glass IR stop filters absorb, but glass itself reflects IR. IR ...
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### Colored fringes in optics

What optics principle is responsible for the colored fringes seen in the attached picture?strands of hair reflecting sunlight when held very close to the lens[]1]1
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### Is there a way to make infrared pass through metals?

I am curious to know a way that will make infrared pass through metals. Metals are good reflectors of infrared,can we manipulate the wave in order to make them pass through metals?.
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### Is there an optic which reflects RCP beam and transmits LCP beam, or vice versa?

I'm currently looking for an optic which reflects the right circular polarized (RCP) beam and transmits the left circular polarized (LCP) beam, or vice versa. I prefer the incident angle of 0 deg but ...
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### Why can't ultraviolet light pass through glass?

What factor determine whether a body behaves like a transparent object for EM waves of a particular frequency?
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### Does diffraction depend on refractive index of a medium?

Does diffraction pattern depend on refractive index of a medium? Does the transmitting media influence on difraction the phenomenon or is it caused by light and the edge alone? Is a diffraction ...
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### Reflectivity of metallic surfaces

Can someone please point me to an academically verified web resource/page that tabulates the Reflectivity of various metallic surfaces like gold, silver , aluminum, etc.? I have found a list on ...
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### Why are birefringence materials so rare?

By symmetry, most crystals will show birefringence. But the effect is very minute. So the question is actually, why is the birefrigence effect in most low-symmetry materials so small?
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### Classical (non-quantum) explanation for the transparency of glass?

Is there a classical explanation for the transparency of glass? How did physicists explain the transparency of glass before quantum mechanics?
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### What does the refractive index for e.g. alpha mean?

When I look for some materials like https://en.wikipedia.org/wiki/Barium_sulfate and want to extract the refractive index then there is written: (nD)=1.636 (alpha). And sometimes also for beta and ...
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I am working on a project and I am trying to build augmented reality glasses. I have a question about focusing the projection from screen and the real object on the far distance at the same time. How ...
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### Why does certain clear plastic have an inner glow?

A type of plastic used in packaging for tamper resistant seals appears to have (what I can best describe as) a purplish inner glow under sunlight, and perhaps other bright light. In the image below, ...
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### Focal plane of ideal thin lenses and spherical mirrors

Recently I was studying about optical instruments and in my book I came across a point which stated that When non axial parallel rays are incident on an ideal spherical mirror at a small angle or a ...
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### Reflection coefficient phase using Kramers Kronig, formula equivalence

Why are the following two formulas for the phase of the reflection coefficient equivalent (according e.g. to [1])? \begin{align} \Theta(\omega_0) & = - \frac{\omega_0}{\pi}P\int_{0}^{\infty}\frac{...
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### How does light pass through any glass? [duplicate]

This might be a very stupid question for Science students, but I had this doubt always, since childhood. I still don't understand even when I'm adult because I didn't read science in detail. When I ...
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### Why is glass transparent?

Once I asked this question from my teacher and he replied "Because it passes light.". "And why does it pass light?" I asked and he said, "Because it is transparent.". The same question again, Why ...
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### 473 nm light through a single mode fiber designed to operate between 1500 and 1600 nm

Can we send light with 473 nm through a single mode fiber designed to operate between 1500 to 1600 nm spectrum? The radius of the fiber core is 4.25 micrometer, NA=0.12 and the single-mode cut-off is ...
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### How to design material to avoid (light) reflections?

I wondered how a material (maybe for example a glass window) must be made to provide none or very few reflections. And while I think about it I don't really know which interaction is behind reflection....
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### Are there any real-world examples of refraction of light by magnetic permeability?

The question Fresnel Transmission Coefficient for Magnetic Field is interesting. Thinking about it led me to reflect upon what little I know of the history of optics, with refraction by lenses and ...
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### Reason for change in colour of light

We all know that light has constant speed, and variable wavelength, and frequency. Suppose I have a big red glass square sheet. When white sun rays pass through it, their colour changes from white to ...
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### Cooling photons to a solid state

Can we cool photons so the stop moving completely? So they can behave like particles in a solid.
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### A simple thin-film transmittance calculation problem

I am trying to reproduce results of thin-film transmittance given in this article by using this online thin-film calculator tool (www.filmetrics.com). I would like to use the calculator later for more ...