opti510r: photonics...calcite caco3. polarization optics ... cubic crystal glass. anisotropic media...
TRANSCRIPT
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OPTI510R: Photonics
Khanh Kieu
College of Optical Sciences,
University of Arizona
Meinel building R.626
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Important announcements
Homework #2 is due Feb. 11
Mid-term exam Feb 27, 2PM (open book/notes)
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Photonics West
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Photonics West
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Photonics West
Photonics West is the premier photonics and laser event. With
more than 1,250 companies, this exhibition continues to be the
flagship event to find the latest products, tools, and applications
for your research or business needs.
Over 20,000 registered attendees
1,260 exhibiting companies
more than 4,700 presentations
Symposia on BIOS, LASE, OPTO, MOEMS-MEMS
and Green Photonics
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Photonics West
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Polarization optics
Polarization optics
Anisotropic media
Index ellipsoid
Uniaxial crystal
Double refraction
Polarization devices
Polarizer
Waveplates
Faraday effect
Isolators
Polarization microscope
Phase matching
Potassium Niobate
Calcite CaCO3
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Polarization optics
The polarization of light is determined by the trajectory of the end
of the electric vector in time at a given position.
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Polarization optics
Plastic spoons and folks Thin slide of a meteorite
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Polarization optics
Polarization multiplexing: multiply bit-rate
Terabit-Scale Orbital Angular Momentum Mode Division
Multiplexing in Fibers,” Science 2013
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Polarization optics
Plane wave propagating in the z direction:
Where:
describes an ellipse (z = const)
(A: complex envelope)
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Some useful formulae
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Polarization optics
Plane wave propagating in the z direction:
Where:
describes an ellipse (z = const)
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Polarization optics
(Homework)
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Linear polarization
ax or ay = 0
or: = 0 or
Plane polarization
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Circular polarization
ax = ay
= +/2
ax = ay
= -/2
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Poincaré sphere
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Other representations
Stokes parameters:
Jones vector:
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Anisotropic media
Propagation of light depends on the propagation direction!
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Isotropic media
n is a number for isotropic materials such as
gas, glass, cubic crystal etc.
er is material relative permittivity
mr is material relative permeability, ~ 1 for non-
magnetic material
Polarization density, P, is proportional to E, c is
electric susceptibility
rrn me
vcn /
c
ce
1
0
n
EP
cubic crystalglass
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Anisotropic media
The electric permittivity is a matrix (tensor)
D and E may point to different directions
By choice of the coordinate system we can simplify the math:
(Principle refractive index)
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Anisotropic media
Index ellipsoid (representation of the tensor):
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Uniaxial crystals
Calcite, Rutile TiO2,
Yttrium Vanadate
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Uniaxial crystals
The direction of energy flow is not the
same as the wave
front propagation direction
Double refraction
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Polarization devices
Polarizer:
Dichroic polarizer (Stretched Polyvinyl Alcohol (PVA)
Double refraction polarizer
Glan-Thompson polarizer
Glan-Thompson polarizer
(Polarization extinction ratio: PER)
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Polarizer
Nichol prism
Glan-Foucault prism
Wollaston prism polarizerBeam-displacement prism polarizer
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Waveplates
Linearly polarized light decomposes
into two components: parallel (green)
and perpendicular (blue). Green
travels slower and is delay by half
wavelength.
• Usually made of birefringent crystal with extraordinary axis parallel to the surface of the plate and with a carefully chosen thickness
• = 180 degree, use to rotate linear polarization, change right to left circular polarized light (half waveplate)
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Waveplates
• = 90 degree
• Turn plane polarized light into circularly polarized light and vice
versa
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Faraday effect
Wikipedia.org
β is the angle of rotation (in radians)
B is the magnetic flux density in the direction of
propagation (in teslas)
d is the length of the path (in meters) where the light and
magnetic field interact
is the Verdet constant for the material.
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Faraday effect
Wikipedia.org
Brain waves magnetometer
(NIST)
β is the angle of rotation (in radians)
B is the magnetic flux density in the direction of
propagation (in teslas)
d is the length of the path (in meters) where the light and
magnetic field interact
is the Verdet constant for the material.
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Isolators
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Isolators
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Polarization microscope
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Phase matching
Phase matching conceptSecond harmonic generation
LBO
crystal
Input IR beam
Angle and Wavelength
Dependence of Refractive
index of BBO
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Questions for Thoughts
• Can we explain polarization of light using a theory other than the wave
theory?
• I would like to be at Photonics West, what should I do to get there?
• Do you want to have a booth at Photonics West?
• What are the hottest research areas in optics?
• A new Tucson-based optics company providing polarization devices?