Diffraction

Diffraction of light through a small slit, around an obstacle, around a corner, as well as the interference pattern (Fraunhofer equation) and dispersion due to diffraction. For more related figures, please see the Optics category.

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% Author: Izaak Neutelings (June 2020)
% Inspiration:
%  https://courses.physics.ucsd.edu/2011/Summer/session1/physics2c/diffraction.pdf
%  https://tex.stackexchange.com/questions/201830/periodic-shading-in-tikz
\documentclass[border=3pt,tikz]{standalone}
\usepackage[outline]{contour} % glow around text
\usepackage{physics}
\usepackage{xcolor}
\usepackage{etoolbox} %ifthen
\usetikzlibrary{calc}
\usetikzlibrary{arrows,arrows.meta}
\usetikzlibrary{decorations.markings}
\usetikzlibrary{angles,quotes} % for pic (angle labels)
\usetikzlibrary{fadings}
\tikzset{>=latex} % for LaTeX arrow head
\contourlength{1.6pt}
\colorlet{wall}{blue!30!black}
\colorlet{myblue}{blue!70!black}
\colorlet{myred}{red!65!black}
\colorlet{mypurple}{red!50!blue!95!black!75}
\colorlet{myshadow}{blue!30!black!90}
\colorlet{mydarkred}{red!50!black}
\colorlet{mylightgreen}{green!60!black!70}
\colorlet{mygreen}{green!60!black}
\colorlet{myredgrey}{red!50!black!80}
\tikzstyle{wave}=[myblue,thick]
\tikzstyle{mydashed}=[black!70,dashed,thin]
\tikzstyle{mymeas}=[{Latex[length=3,width=2]}-{Latex[length=3,width=2]},thin]
\tikzstyle{mysmallarr}=[-{Latex[length=3,width=2]}]
\tikzset{
  declare function={
    int_arg(\y,\lam,\a,\L) = \a*\y/sqrt(\L*\L+\y*\y)/\lam; %sin(\x);
    int_one(\y,\lam,\a,\L) = (sin(180*int_arg(\y,\lam,\a,\L))/(pi*int_arg(\y,\lam,\a,\L)))^2;
    int_two(\y,\lam,\a,\L) = cos(180*int_arg(\y,\lam,\a,\L))^2;
    int_arg_ang(\t,\lam,\a) = \a*sin(\t)/\lam;
    int_one_ang(\t,\lam,\a) = (sin(180*int_arg_ang(\t,\lam,\a))/(pi*int_arg_ang(\t,\lam,\a)))^2;
    int_two_ang(\t,\lam,\a) = cos(180*int_arg_ang(\t,\lam,\a))^2;
  }
}
 
 
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Click to download: optics_diffraction.tex • optics_diffraction.pdf
Open in Overleaf: optics_diffraction.tex