Image:Circular polarization schematic.png

set term png crop 
 set output "Circular polarization schematic.png"
 
 set parametric
 
 set size square 1.5,1.5
 set samples 200
 
 set format  ""
 set nokey
 set noztics
 
 set border 1023-32-128
 tl = 0.2
 mu = 10*pi
 f = 1.0
 set urange [0:mu]
 set xrange [-1:1]
 set yrange [-1:1]
 set arrow from -1,0,-tl*mu to 1.5,0,-tl*mu lt -1
 set arrow from 0,-1,-tl*mu to 0,1.5,-tl*mu lt -1
 set arrow from 0,0,-tl*mu to 0,0,mu*1.3 lt -1 lw 1
 set ticslevel 0
 set view 60, 135, 0.3, 3
 splot \
 sin(u), -1, u w l, \
 -1, f*cos(u), u w l,\
 sin(u), f*cos(u), -tl*mu w l lt 4 lw 4,\
 sin(u), f*cos(u), u w l lt 3 lw 4
 
 set output