Questions tagged [optical-materials]
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285 questions
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What, really, makes glass transparent? [duplicate]
I don't mean to be cheeky with the question, but it reflects the myriad of often seemingly conflicting answers I've seen around this. And that's not surprising of course given the dual nature of light ...
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Is it possible to optimally transmit solar radiation by a system of multiple optical fibers?
As we all know, if an optical fiber is designed with the right material and properly bent, light can be transmitted along the fiber with very little attenuation.
Figure 1 shows the interaction of ...
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Why are very thick soap bubbles colorless?
Is it simply because the wavelength where constructive interference occurs gets to be too long?
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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 ...
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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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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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Which transparent material alters light the least?
I am making a spectrometer as my school project. It's main application will be analyzing the light emitted by various light sources. It measures visible, near IR and UVA/UVB radiation. I need it to be ...
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Ray Optics: Reflection and Refraction
Suppose you have extremely sensitive photographic film and you can expose it in an optical system for a very long time. Will you be able to record a virtual image on film?
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What determines how much partial reflection occurs at a boundary between two media?
Some thoughts I had about this are:
does it depends on the two media? Surely it must do. If so, what properties of the media dictate the extent of partial reflection?
this point is highly dependent ...
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Shielding (filtering/absorbing) xrays only
Is there a material that could filter the x-ray wavelengths but leave visible, ultraviolet, and infrared relatively unaltered? Ideal would be something that could be painted on a sheet and placed in ...
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Thin Lens in different media
I have been given an equiconvex lens (of given focal length), placed on a plane mirror, with water between the lens and the mirror.
An object has been placed at a certain distance and I have been ...
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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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Do there exist materials whose Opacity varies with temperature?
Do there exist materials whose Opacity varies with temperature?
E.g a Material that becomes more Opaque as it gets hotter?
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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 ...
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Are there everyday materials that change color, depending on illumination spectrum?
Initially I wanted to ask this exact question about color change due to "white" light source spectrum change, and the accepted answer satisfies me fully.
However the answer says that most of ...
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Difference between seed and pump in chirped pulse amplifier
What is the difference between to seed an optical amplifier (such as Chirped Pulse Amplifier) and to pump it with a laser source?
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Why do efficient blue emitters (LEDs,OLEDs, quantum dots) take much longer to discover than red and green emitters?
For example, it took over 3 decades to create efficient blue LEDs in the lab after the red and green leds were discovered. For OLED displays as well, the red and green pixels are phosphorescent oleds ...
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Birefringence in uniaxial materials
In linear optics, when treating anisotropic uniaxial materials we get the frensel equation
this equation gives us two solution for n. My problem is that according to Snell's law, if I have two ...
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Regarding measurements on traveling microscope
In a experiment with traveling microscope to determine thickness of a glass slab , what is the physical significance of the readings that we get from the vertical scale ?, Means What are two points ...
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Phase shifted Optical Fiber Bragg grating Response
As we know there is a narrow notch in the reflectance spectrum of a Phase shifted FBG. We have Bragg condition for reflected band of any uniform FBG. My question is that, does anyone know any relation ...
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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 ...
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How can we measure thickness of a wet film without destroying it's surface?
I have an opaque(wet) material thin film on a glass plate. How can I measure the thickness of the film without destroying the surface?
I am thinking that I might be able to use a spectroscopic ...
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Why glass is considered as an opaque body...? [closed]
We know that the transmissivity of glass is 0 then also in general conditions it is taken as an opaque body and also in some books, it is taken as an opaque body.
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Why does the definition of angular magnification relative to the substended angle of least distence that the eye can see
The angular magnification defined as,
angle subtended by image of object /angle subtended by object when 25
cm from the naked eye
Consider this.
An object is placing 50cm in front of a convex ...
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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?.
user197535
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What are the other ways to pass particular wavelength of light without using optical band pass filters?
I'm working on an experiment that have visible spectrum light source (RGB LED at e.g. 495–570 nm wavelength), holder with sample, narrow bandpass filter (eg: CWL:520nm, FWHM:5nm) and a photodiode to ...
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Parameters for custom lens design
First, problem background: I'm attempting to source lenses for use in eyeglasses to deal with extreme sensitivity to chromatic aberration, and likely need either achromatic doublets or single lenses ...
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What photoconducting materials/metamaterials reach full conductivity within 1/30th of a picosecond
I'm doing research on photoconducting materials/metamaterials but I'm having a hard time finding confirming how fast they reach full conuctivity, What photoconductors reach full conductivity and back ...
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Do some materials change optical characteristics under stress/strain?
My (basic) understanding of lenses is that their refraction is largely determined by the material (index of refraction) and shape.
It seems possible to make lenses out of deformable materials, which ...
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Values for the light transmittance of glass
I would like to ask if somebody knows where is it possible to find percentages for light transmittance of different unusual glasses such as matte, glossy, stained glass, etc.?
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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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Are there any CO2-Laser notch filters? [closed]
I'm searching for a notch (band-stop) filter (like [1]) for a 10.6 $\mu$m CO$_2$-Laser and I have yet to find one. Is there some physical reason such filters don't exist or is there just no demand?
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Material that changes transparency when lased from side?
I am into photonics research, and have been searching about this topic in vain, but almost nothing from Google shows up. So i turned here for some light.
Do you guys know any material that changes ...
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Crystal field in diamond
The crystal field effect occurs in ionic crystals and causes a splitting of the magnetic quantum levels of the cation. The magnitude of the splitting may be roughly computed by obtaining the potential ...
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Electrooptic Tensor, Relating Tensors to Orientations
So I'm trying to gain a better understanding of electrooptic tensors:
An example of a quartz electrooptic tensor is given.
I know in order to best implement this crystal, in order to get the highest ...
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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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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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Knowing the optical path difference, how do I calculate the resulting image?
Let's say I'm taking a picture through a cube of some material where the index of refraction varies in a known way, such as a GRIN lens. I can calculate the optical path difference as a function of ...
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What difference between metallic reflection and polished/mirror reflection [closed]
At the moment I am studying materials in raytracing (I am writing my own personal project)
I found out that there are several types of reflections.
I read this article from wikipedia:
https://en....
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Laser confocal microscope filter
I wanted to mount a narrow bandpass filter which allows to transmit 405 nm wave, i. e. the laser wavelength. I wanted to cut off other light, cause my detector is also sensitive to other wavelengths.
...
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Recording Analog Data in Optical Disc Using Laser Beam Mechanism [closed]
Is it possible to storing/writing any Analog Audio Signal (i.e. Vinyl Record & etc) into a little bigger and thicker Optical Disc as compared to the other conventional Compact Disc while using the ...
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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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Deriving Wavelength from Relative Intensity with Broad Spectrum Light Sensor [closed]
I have this broad spectrum light sensor and it gives me readings in relative intensity, but says that it's able to measure the wavelength. The documentation is rather unhelpful, so I was wondering how ...
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Can plasmon nanoparticles be displaced by EM field’s?
As at specific frequencies of light, a plasmonic nanoparticle’s electron cloud will predominately shift to one part of the material, will this cause the material to shift in that direction?
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Does reflection depend on wavelength?
I'm aware of processes like Rayleigh scattering, Compton scattering and pair production. But as these processes treat light as being particles(?) I'm not sure whether they are helpful to understand ...
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Why is Sellmeier's equation an even function of $\lambda$?
According to Sellmeier's formula, the dispersion formula of a transparent material can be written as
$$n^2(\lambda) = 1 +\sum_i\frac{B_i \lambda^2}{\lambda^2 - C_i},$$ where $B_i$ and $C_i$ are ...
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Quantum Dot Surface Area to Volume Relationship
Do the properties off quantum dots depend more on their surface area rather than the volume they occupy?
Depending on the case, then would quantum dots of different shapes show different properties?
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Is there a nonlinear optical material that absorbs visible light stronger with increasing intensity independent of its wavelength?
One of the main shortcomings of digital image sensors is the quite "unnatural" behaviour for rendering highlights compared to film (and the human eye, I guess). Typically, with increasing ...
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Why is Indium Tin Oxide (ITO) transparent to visible light and have low transmission to infrared light?
I read that Indium Tin Oxide transmits most of visible light while blocking a high percentage of infrared light.
What is the principle behind this property?
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Coupling of resonant modes in a 1D Photonic Crystal
In 1D Photonic crystals, a defect can be introduced to create a defect/resonance mode and enable transmission. At first considerations, the thickness of the single defect layer determines the ...
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