Elliptical Polarization

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\documentclass[border=3pt]{standalone}
% Drawing
\usepackage{tikz}
\usetikzlibrary{3d}
\usetikzlibrary{shapes.multipart, arrows.meta}
%Styles
\tikzset{>=latex}
\tikzset{axis/.style={black, very thick, ->}}
\tikzset{ef/.style={very thick, red}}
\tikzset{vec/.style={black, -{Latex[length=0.8mm]}}}
\tikzset{every text node part/.style={align=center}}
% Commands
%% Rectangle
\newcommand{\rect}[2]{%
    \begin{scope}[canvas is xz plane at y=1.2]
        \draw[thick, fill=black!40] (#1,-1.2) rectangle (#1+0.2,1.2);
    \end{scope}
    %
    \begin{scope}[canvas is xy plane at z=1.2]
        \draw[thick, fill=black!25](#1,-1.2) rectangle (#1+0.2,1.2);
    \end{scope}
    %
    \begin{scope}[canvas is yz plane at x=#1]
        \draw[thick, fill=black!10] (-1.2,-1.2) rectangle (1.2,1.2);
        \draw[thick, fill=black!10, dashed] (0,0) ellipse (0.8cm and 0.6cm);
    \end{scope}
}
\newcommand{\cdraw}[2]{\draw[very thick, -stealth, red] (0,0) -- ({#1*cos(#2)}, {#1*sin(#2)});}
% Notation
\usepackage{amsmath}
\begin{document}
\begin{tikzpicture}[x={(0.8cm, 0.4cm)}, y={(0.9cm, -0.3cm)}, z={(0cm,1cm)}, line cap=round, line join=round]
    
%   % Main Axes
 
 
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