File:Poincare-sphere stokes.svg

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Original file ‎(SVG file, nominally 600 × 600 pixels, file size: 4 KB)

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DescriptionPoincare-sphere stokes.svg	English: Drawing of a Poincaré sphere, which illustrates the space of possible polarisations of electromagnetic waves. The sphere is drawn with three great circles and labels for six basic polarisations H (linear horizontal), V (linear vertical), D (linear diagonal), A (linear antidiagonal), R (right-hand circular) and L (left-hand circular). Additionally the coordinate system of Stokes vectors with components S₁, S₂ and S₃ is drawn in the center of the sphere. Deutsch: Zeichnung einer Poincaré-Kugel, die den Raum der möglichen Polarisationen elektromagnetischer Wellen darstellt. Die Kugel ist mit drei Großkreisen gezeichnet und mit Zeichen für die sechs Basispolarisationen H (linear horizontal), V (linear vertikal), D (linear diagonal), A (linear antidiagonal), R (rechtshändig zirkular) and L (linkshändig zirkular). Zusätzlich befindet sich im Zentrum der Kugel das Koordinatensystem aus Stokesvektorkomponenten S₁, S₂ and S₃.
Date	31 August 2014
Source	Own work
Author	Geek3
Other versions	Poincare-sphere_arrows.svg (with additional small images of the polarisation vectors)

Source Code[edit]

The image is created by the following source-code. Requirements:

python3 source code:

# -*- coding: utf-8 -*-
try:
    import svgwrite as svg
except ImportError:
    print('You need to install svgwrite: http://pypi.python.org/pypi/svgwrite/')
    # documentation at http://pythonhosted.org/svgwrite/
    exit(1)

from math import *

def to_xyz(theta, phi, r=1):
    return r * sin(theta) * cos(phi), r * sin(theta) * sin(phi), r * cos(theta)

def to_theta_phi_r(x, y, z):
    return atan2(z, sqrt(x**2 + y**2)), atan2(x, y), sqrt(x**2+y**2+z**2)
    
def rotx(x, y, z, a):
    y, z = cos(a) * y + sin(a) * z, cos(a) * z - sin(a) * y
    return x, y, z

def ellipse_path(theta, phi, tilt, flip=False):
    t, p, r2 = to_theta_phi_r(*rotx(*(to_xyz(theta, phi, 1) + (tilt,))))
    a = abs(r)
    b = abs(r * sin(t))
    return 'M %f,%f A %f,%f %f %i,%i %f,%f' % (-r*cos(p), -r*sin(p),
        a, b, p*180/pi, 0, {True:1, False:0}[flip], r*cos(p), r*sin(p))
 
 
# document
size = 600, 600
doc = svg.Drawing('poincare-sphere_stokes.svg', profile='full', size=size)
doc.set_desc('poincare-sphere_stokes.svg', '''Drawing of a poincare-sphere with polarisations H, V, D, A, R and L, and a coordinate system of Stokes-Vectors S1, S2 and S3
rights: GNU Free Documentation license,
        Creative Commons Attribution ShareAlike license''')

# settings
dash = '8,6'
col = 'black'
r = 240
tilt = radians(-70)
phi = radians(-25)
cp, sp = cos(phi), sin(phi)

# background
doc.add(doc.rect(id='background', profile='full', insert=(0, 0), size=size, fill='white', stroke='none'))

# arrow markers
arrow_d = 'M -4,0 L 2,-3 L 1,0 L 2,3 L -4,0 z'
arrow1 = doc.marker(id='arrow1', orient='auto', overflow='visible')
arrow1.add(doc.path(d=arrow_d, fill=col, stroke='none',
    transform='rotate(180) scale(0.7)'))
doc.defs.add(arrow1)
arrow2 = doc.marker(id='arrow2', orient='auto', overflow='visible')
arrow2.add(doc.path(d=arrow_d, fill=col, stroke='none',
    transform='scale(0.7)'))
doc.defs.add(arrow2)
arrow3 = doc.marker(id='arrow3', orient='auto', overflow='visible')
arrow3.add(doc.path(d='M 8.7185878,4.0337352 L -2.2072895,0.016013256 L 8.7185884,-4.0017078 C 6.9730900,-1.6296469 6.9831476,1.6157441 8.7185878,4.0337352 z', fill=col, stroke='none',
    transform='scale(0.8) rotate(180)'))
doc.defs.add(arrow3)

# make a group for the sphere
sphere = doc.g(transform='translate(300, 300)', fill='none', stroke=col, stroke_width='2')
sphere['font-family'] = 'DejaVu Sans'
sphere['font-size'] = '42px'
doc.add(sphere)

# back ellipses
sphere.add(doc.path(d=ellipse_path(0, 0, tilt),
    stroke_dasharray=dash, stroke=col))
sphere.add(doc.path(d=ellipse_path(pi/2, phi, tilt, True),
    stroke_dasharray=dash, stroke=col))
sphere.add(doc.path(d=ellipse_path(pi/2, phi+pi/2, tilt),
    stroke_dasharray=dash, stroke=col))

# draw coordinate axes
sphere.add(doc.circle(center=(0, 0), r=5, fill=col, stroke='none'))
for i in range(3):
    xyz = [0, 0, 0]
    xyz[i] = 0.3 * r
    x, y, z = xyz
    x, y, z = rotx(x*cp + y*sp, y*cp - x*sp, z, tilt)
    line = doc.line(start=(0, 0), end=('%f' % x, '%f' % y), stroke=col)
    line['marker-end'] = arrow3.get_funciri()
    sphere.add(line)

# the six defined points
pts = []
for x,y,z in [[0,0,-1], [0,0,1], [0,-1,0], [0,1,0], [-1,0,0], [1,0,0]]:
    x, y, z = rotx(r * (x*cp + y*sp), r * (y*cp - x*sp), r * z, tilt)
    if z >= 0:
        continue
    pts.append((x, y))
    sphere.add(doc.circle(center=('%f' % x, '%f' % y), r=6,
        fill=col, stroke='none'))

# V label
sphere.add(doc.text('V', text_anchor='middle',
    transform='translate(144, -86)', stroke='none', fill=col))

# Stokes-Vector labels
sphere.add(doc.text('P₁', text_anchor='middle',
    transform='translate(-56, 33)', stroke='none', fill=col))
sphere.add(doc.text('P₂', text_anchor='middle',
    transform='translate(63, -2)', stroke='none', fill=col))
sphere.add(doc.text('P₃', text_anchor='middle',
    transform='translate(-29, -59)', stroke='none', fill=col))

# sphere surface
grad1 = doc.defs.add(doc.radialGradient(id='grad1',
    center=(0.375, 0.15), r=0.75, gradientUnits='objectBoundingBox'))
grad1.add_stop_color(offset=0, color='#ffffff', opacity=0.3)
grad1.add_stop_color(offset=1, color='#dddddd', opacity=0.3)
sphere.add(doc.circle(center=(0, 0), r=str(r),
    fill='url(#grad1)', stroke='none'))
grad2 = doc.defs.add(doc.radialGradient(id='grad2',
    center=(0.45, 0.45), r=0.575, gradientUnits='objectBoundingBox'))
grad2.add_stop_color(offset=0.6, color='#cccccc', opacity=0)
grad2.add_stop_color(offset=0.8, color='#cccccc', opacity=0.2)
grad2.add_stop_color(offset=1, color='#333333', opacity=0.2)
sphere.add(doc.circle(center=(0, 0), r=str(r),
    fill='url(#grad2)', stroke='none'))

# the six defined points
for x,y,z in [[0,0,-1], [0,0,1], [0,-1,0], [0,1,0], [-1,0,0], [1,0,0]]:
    x, y, z = rotx(r * (x*cp + y*sp), r * (y*cp - x*sp), r * z, tilt)
    if z < 0:
        continue
    pts.append((x, y))
    sphere.add(doc.circle(center=('%f' % x, '%f' % y), r=6,
        fill=col, stroke='none'))

# H, D, A, R, L labels
sphere.add(doc.text('H', text_anchor='middle',
    transform='translate(-144, 115)', stroke='none', fill=col))
sphere.add(doc.text('D', text_anchor='middle',
    transform='translate(272, 52)', stroke='none', fill=col))
sphere.add(doc.text('A', text_anchor='middle',
    transform='translate(-272, -26)', stroke='none', fill=col))
sphere.add(doc.text('R', text_anchor='middle',
    transform='translate(0, -261)', stroke='none', fill=col))
sphere.add(doc.text('L', text_anchor='middle',
    transform='translate(0, 291)', stroke='none', fill=col))

# front ellipses
sphere.add(doc.path(d=ellipse_path(0, 0, tilt, True)))
sphere.add(doc.path(d=ellipse_path(pi/2, phi, tilt)))
sphere.add(doc.path(d=ellipse_path(pi/2, phi+pi/2, tilt, True)))

# circle edge
sphere.add(doc.circle(center=(0, 0), r=str(r)))

doc.save()

Licensing[edit]

I, the copyright holder of this work, hereby publish it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

This file is licensed under the Creative Commons Attribution 3.0 Unported license.

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to share – to copy, distribute and transmit the work
to remix – to adapt the work

Under the following conditions:

attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:49, 31 August 2014		600 × 600 (4 KB)	Geek3 (talk \| contribs)	fixing labels
	17:31, 31 August 2014		600 × 600 (4 KB)	Geek3 (talk \| contribs)	Poincare Sphere with Stokes vectors

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Short title	poincare-sphere_stokes.svg
Image title	Drawing of a poincare-sphere with polarisations H, V, D, A, R and L, and a coordinate system of Stokes-Vectors S1, S2 and S3 rights: GNU Free Documentation license, Creative Commons Attribution ShareAlike license
Width	600
Height	600

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File:Poincare-sphere stokes.svg

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Poincaré sphere

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some value

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copyright license

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Creative Commons Attribution 3.0 Unported

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31 August 2014

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