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Questions tagged [diffraction]

Diffraction is defined as the bending or flaring of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle. This flaring is consistent with the spreading of wavelets in the Huygens construction. Diffraction occurs for waves of all types, not just light.

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How to compute the diffraction efficiency of a thin phase grating with arbitrary groove shape?

From Magnusson and Gaylord (1978), the wave amplitudes, $S_i(z)$, of $p$-polarized light for a thin, arbitrary phase grating are given by the equation $$ \frac{\partial S_i}{\partial z} + \gamma \sum_{...
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Modified two slit diffraction experiment

I thought up a slight modification to the classic two-slit experiment that would be fun to try, but I am certain that I am not the only person to consider it, and would like to know if it has already ...
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Is it possible for a double slit experiment to create an interference pattern at 90 degrees?

If the light diffracts perpendicular to the slits, then would an interference pattern 90 degrees from the slits be observed?
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Bethe diffraction: surface charge density of an ellipsoid

I'm having a hard time following one part of Bethe "Theory of diffraction by small holes" paper, which can be found here: https://web.stanford.edu/class/ee349/Handouts/Bethe_PR1944.pdf At ...
Fernando's user avatar
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Why do gaps in my blinds create multiple lines?

Multiple lines appear on my floor every morning from the gaps in my blinds. Why does this happen and does it have to do with light being a wave, like in the double slit experiment? If so could it be ...
user2918098's user avatar
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How does the diffraction pattern of a 2-dimensional grating/lattice relate to the reciprocal lattice?

I am trying to understand the relationship between the diffraction pattern produced when shining light onto a 2D lattice and the reciprocal lattice of the direct lattice in question. So suppose we ...
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Fraunhofer temporal far-field condition for dispersive Fourier transform (DFT) technique

I am trying to understand the dispersive Fourier transform (DFT) technique for spectral characterization of pulses. In the literature, I found this far-field condition from Fraunhofer approximation in ...
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How to compare XRD data from literature?

I'm a grad student. Trying to do a literature review this summer. My advisor is telling me to gather XRD data of my samples for my research, and I have. Unfortunately, I have no idea how to compare it/...
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How many distinct phonon branches will I see for 3 atoms in the unit cell, along the [100] direction?

Silicon (Si) crystallises in the fcc cubic structure with two atoms in the primitive unit cell. How many acoustic and optical phonon branches does it have? How many distinct branches in the ...
Despaxir's user avatar
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Pointing flash at LCD television creates a weird diffraction effect

I was looking around my room for something with my phone’s flash on, and noticed a very unique pattern reflecting off of the television. FYI. The flash is white. Any idea why it diffracts like that? ...
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Diffraction of a double slit where the slits are far apart

I'm trying to figure out how I can possibly know the real equation of the intensity of the diffraction pattern of a double slit (I don't care about interference for now). Here are my thoughts: ...
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Why is the shorter the wavelength, the smaller the object you can image? and vice-versa?

I know that the shorter the wavelength the smaller the object you can image clearly. Why wavelength matters in imaging something? How having big wavelength wont let u image smaller object, like if u ...
nishat tahsin's user avatar
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Why diffraction is not happening?

Recently i encountered a problem on the Young's Double Slit Experiment. The question was paragraph and had multiple sub-parts on the different variations of the experiment. One of them was about what ...
Yash Shrivastava's user avatar
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Why interference is happening with two slits but diffraction is happening with one slit?

why interference is happening with two slits but diffraction is happening with one slit? In the case of interference diffraction also happens but not the other way around? Why so?
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Question on Babinet's principle example

Say we have the following mask (I drew it myself on paint): I asked myself if it is possible to know the form of the image generated on a screen after the mask or know the electric field generated ...
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General questions on the "big picture" of scalar diffraction theory

When studying diffraction, my courses at university stopped with frauenhofer diffraction, which - as far as I understand it - describes the diffracted far field for diffraction of a more or less ...
Pidrittel's user avatar
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Babinet's principle, Arago point and Airy's disc

As far as I'm concerned, Arago's point is the central pattern we observe when we illuminate an opaque disc-like object, while an Airy disc is the pattern we obtain when passing light through a disc-...
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How to propagate the wavefunction of a photon in single slit diffraction?

During my undergrad, I remember writing a simulation in which the diffraction patterns which emerge from light passing through a single slit were calculated. This was done, basically, by calculating ...
Gregor Hartl Watters's user avatar
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Why in the experiment of double slits, in case of radiation of wavelength of red light, we can observe an envelop of the minimum?

I have made an experiment in which i have to measure the intensity of the light generated by an $\text{He-Ne}$ laser, in the case of two slits, I pretend to observe an interference lattice. I have to ...
Matteo Saba's user avatar
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Fraunhofer diffraction from composite apertures

I'm trying to calculate the fraunhofer diffraction pattern from a aperture composed of multiple simple shapes, but I've ran into some trouble when trying to simulate the results and I really dont ...
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What physical processes are involved in causing the Voigt profile in X-ray diffraction

I understand qualitatively that a Voigt profile combines both Gaussian and Lorentzian profiles which is a suitable method for plotting an X-ray diffraction pattern. Which physical processes lead to ...
Exterminator2004's user avatar
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Is refraction a special case of diffraction according to the book by Charles Kittel?

Wikipedia defines diffraction as - Diffraction is the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/...
Vatsal Sharma's user avatar
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Applying Fermat's principle in Fraunhofer's diffraction

The following set up with a source, 2 convex lenses, a slit and a screen is of that of Fraunhofer's diffraction: *Correction S is not on the common optical axis, but above it. $\theta$ = Angle ...
soccerer's user avatar
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What is the upper limit of size for diffracting an object?

All items in the universe can be said to have a De Broglie wavelength which is significant if that wavelength is comparable to the object's size (I don't have to worry about my wavelength diffracting ...
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Using the Bloch Ansatz in the Stationary Schrödinger Equation to Derive Dynamical Diffraction Intensity Equations

I am working on deriving the intensity equations for the dynamical diffraction of neutrons following along with a paper by Hartmut Lemmel (Hartmut Lemmel. Dynamical diffraction of neutrons and ...
pyguy83's user avatar
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Diffraction grating from reflection

We had an experiment in our physics lab where we used two grating materials one with 2500 lpi(say A) and the other with 15000lpi(say B). Now when we shine white light on both of them we didn't get any ...
Ankit's user avatar
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Diffraction proof

I am talking about the way we generally explain the occurence of bright and dark fringes during diffraction. When we want to show a dark fringe we consider a pair of secondary light sources who have a ...
Shivam Agarwal's user avatar
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Polarization of electric field and its effect on the Poynting vector

To preface, I've little experience with optics. This is a very use-case specific project I'm undertaking. So, if there are any improvements in my method, I'd appreciate it! I'm working with the vector ...
sphericalcow's user avatar
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In the diffraction of EM waves, what kind of objects do the obstacles need to be?

In the diffraction phenomenon, when I search for layman examples in youtube, I see an image of an obstacle with a tiny hole (aperture) in it, so that light goes through the aperture and scatter around ...
Black Watch's user avatar
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How is the Huygens-Fresnel principle of diffraction modified when light is confined to a planar dielectric waveguide?

The Huygens-Fresnel principle essentially states that in order to propagate an electromagnetic wavefront in free-space, one must superimpose the so-called "secondary wavelets", which are ...
Jake Freedman's user avatar
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Modeling hair strand diffraction?

It's well known that a human hair can diffract light (plenty of demos out there, all you need is a laser pointer and a strand of hair). I've been thinking, however: how can one model this process? The ...
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Why do we only consider two points in Young’s double slit experiment?

Say we have two slits in the xy-plane. The x distance between them is d. Why do we, when calculating the resulting amplitude of the wave, consider only the phase difference of two secondary radial ...
Максим Неважно's user avatar
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Total flux is bigger than radiation flux, error?

The topic of this question is the collection of radiation from the sun. (renewable energy course) The total radiation flux is $$I_\text{total} = I_\text{direct}+I_\text{diffracted}+I_\text{reflected} ....
Root Groves's user avatar
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Why diffraction works at sharp edges?

While introducing Diffraction, physics textbooks say that this effect (Diffraction) is observed distinctively when the light is passed through a very small opening, the length or diameter of which is ...
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Calculating net phase in single slit diffraction

I want to calculate the net phase at a point on the screen in Fresnel diffraction. Attached below is a rough diagram if needed. For this I considered hypothetical $n+1 $ small slits acting as sources ...
Aspirant29's user avatar
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Where does the diffraction equations work and why?

w = fringe spacing $\lambda$ = wavelength D = horizontal distance between slits and screen s = slit spacing d = slit spacing $\theta$ = angle between central maximum and the ray at the nth maximum $\...
Devil's Advocate 2321's user avatar
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Second-order variation of an integral

I was reading the paper SISAR Imaging for Space Debris based on Nanosatellites, in which the Fresnel-Kirchoff diffraction formula is applied for a scenario in which the receiver, transmitter and ...
DaDSPGuy's user avatar
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How is the interference pattern of the double slit experiment quantitatively measured? [closed]

The single photon / single electron double slit experiment shows particles appearing as dots on the screen. This is explained as being due to the collapse of their wavefunctions. However, if they were ...
Blacklight MG's user avatar
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Can you have diffraction without a slit, simply by reducing the size of light source?

Since the diffraction pattern only depends on the width of the slit and the wavelength of light, could we see a diffraction pattern if we use an extremely small (to the order of micrometers) light ...
Dumber Everyday's user avatar
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Why Do Harmonic Components Define Wavelength in Diffraction and Interference Phenomena?

I'm exploring the physical principles underlying diffraction and interference, specifically how these phenomena depend on the wavelength of harmonic (sinusoidal) components of a wave. My question ...
CuriousMind's user avatar
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Need clarity behind the theory of diffraction for a black-body source

Attempting to model the diffraction for a black-body source, I have stumbled upon a bit of a conundrum with the mathematics. I am not asking WHY the light is diffracted, but instead looking for a ...
jambajuice's user avatar
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Interference in single slit

In my point of understanding, interference is produced when waves from two sources of light (may be coherent or non-coherent) overlap resulting in consecutive bright and dark fringes on a screen. But, ...
Vinay5101's user avatar
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1 answer
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Determining the specific diffraction lines when 2 monochromatic beams are incident on a diffraction grating [closed]

I am wondering whether it is possible to determine the exact colour permutation for the diffraction lines from only the following given information: "When monochromatic red and monochromatic ...
ben13215's user avatar
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In single-slit interference, why don't we consider all combinations of points and their contribution to the diffraction pattern?

The explanation I was taught back in college was that we take points $a/2$ spaced apart where $a$ is the width of the slit, and at certain angles the difference in distance traveled will be half a ...
notorious's user avatar
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How to explain interference pattern in our eye?

Suppose we got a Lamp L that emits some light. The light afterwards hits a diffraction Grating G at a distance a. Now if you were to look through the grating with your Eye E, you were to see the ...
Leon's user avatar
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Double slit diffraction integral?

In our physics class, the professor went over a so-called "diffraction integral" for single slit diffraction: $$E = E_0\cos(kx - kct)\qquad\text{then we ignore time dependence}:$$ $$E = E_0\...
JBatswani's user avatar
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Visualizing diffraction with Huygens' principle

I understand (both intuitively and mathematically) Huygens' principle -- that a wave front can be thought of as a sum of infinitely many spherical wavelets, which are each themselves a source of the ...
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Minimum intensity fringes are not perfectly dark in diffraction pattern?

I am studying Interference and Diffraction and everywhere I look it is written that "In an interference pattern,the minima are usually perfectly dark while in a diffraction pattern they are not ...
Akshit Chhabra's user avatar
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Why doesn't a lens after a diffraction grating affect the optical path difference?

When observing interference fringes one often uses a lens after the diffraction grating to focus the fringes on a screen like this: At first sight, one might think that after the lens the path ...
Julia's user avatar
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Finding the Bremsstrahlung in diffraction patterns of NaCl

I recently got the chance to measure the diffraction pattern of a NaCl crystal using the Bragg-Brentano method. I can see the peaks caused by the characteristic lines of the used X-ray tube (in this ...
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