Animated Physics - Understanding Photon Polarization

The only thing for sure about energy, is that its a long way away in a very short time. Ie. in one second its 186,000 miles away. A photon is a packet of energy.

Photons - Polarization
All photons travel at the speed of light, but when they hit something, its like they were pointed in a particular directon, or spinning around a particular axis. This is called the photon polarization.
Polarization can be a direction like up or down, left or right. Polarization can also mean spin in a clockwise or counter-clockwise direction.

The Planck constant
The Planck constant is equal to 6.626*10^-34 Joule-Sec. and establishes the relationship between wavelength and energy. A short length = high energy (ultraviolet) and a long length = low energy (heat).
To convert from length to energy, take 1240 divided by the nanometer wavelength to get the energy in evolts. For a green (630nm) photon 1240/630nm=1.97ev

Quantum Mechanics Concepts - DrPhysicsA

    This video will provide you with the information to calculate the probability that light polarized in a specific direction will get through a polarizer pointed in a different direction. You will learn to represent a photon of light as an array with two complex numbers in it. The complex conjugate of another array (representing the polarizer angle) can then be multiplied by this array (the photon representation) to give you the probability that the photon will go through the polarizer.

    The representation of a photon as a vector, is the polarization component of the Jones Vector. To represent this visually, the real part of the variable is where the polarization is right now. The imaginary part represents where the polarization angle is going. Remember, these angles only represent the amplitude of probability.

0:00Quantum Mechanics Concepts, Dirac notation and photon polarization 1:35Notations and Mathematics, Ket and Bra vectors
3:30Complex numbers and mapping on a plane 5:30Complex conjugates and some calculated results
9:10Ket and Bra vector mathematics, addition and scalar multiplication 11:20Multiply a Bra vector times a Ket vector
14:05Matrices - Conjugated, Transposed and the Dagger 18:40When a matrix is the same as its Daggar - Hermitian
20:00Matrix applied to a Ket vector is new Ket vector 24:57Hermitian matrix, eigenvectors and eigenvalues
27:04Polarization - vertically polarized light 33:20Vertically polarized light through a horizontal polarizer
40:10Physical meaning of Hermitian, eigenvalues and eigenvectors 44:10Orthoganol vectors
46:30Eigenvalues of experiment to test if light is horizontal or vertical 48:40Observable or experiment and state of system, will produce same state depending on polarization
50:0045 degree light through a 45 degree polarizer and normalization 61:0045 degree light through a vertical polarizer
64:00Red light or green light on the detector


Learn axioms, particles and forces of Animated Physics © 2011