Introducing Ferrocell Technology

The Ferrocell's methodology is based on transforming a black, opaque
liquid metal (ferrofluid) into a dispersed, transparent layer less than 50 microns thick.
This layer is contained in a sealed and isolated environment.
In this state, the fluid behaves more like a gas than a liquid.


Looking through an un-activated cell
on a bright, sunny day                         
                       More Info Here


     Apply light and magnetism to either glass surface. Polarization of the applied magnetic field
     will determine the "angle of incidence" light experiences as it exits the cell.
Using a permanent magnet is the easiest way to apply a polar field and see how a 
Ferrocell will change the path of light and also appear as a holographic image to the viewer.
The center point between poles of the viewed image represents the Null Zone or more
generally, the Bloch Wall. The 'lines' on either side of the null indicate magnetic vector potential
(Not field lines like iron filings show)

graphic from Wikipedia Commons

Each point of light will follow a path in relation to its position in
space around the magnetic field and change its dimensional shape
depending on our point of view.
These 'paths' can be twisted, bent, made thicker or thinner, joined or repelled,
added to or subtracted from by the polar influence of two or more magnetic fields.
To make this event visible to the naked eye, a large surface area and strong magnetic fields are required.
Unlike most passive optical devices, a Ferrocell will exhibit the same results with polarized or non-polarized light.
There are other minor functions that happen in the cell, too. The layer of particles act like a filter for higher visible
frequencies (blue, violet) similar to the Christiansen Effect while enhancing lower frequencies (red, IR).
Light experiences Rayleigh & Mie Scattering, plus the Faraday Effect and other Magneto-optic phenomenon.

For more detailed information, see References


Examples of Light Absorption, Emission and Spin
created with a Ferrocell and magnetic field:

Ring of 15 RGB Led's under and around cell. 12.7mm cube magnet setting on glass. Each 'null zone' converges on the magnets poles (bottom and top). We see two bands from each Led as the zones extend to each pole.

1.2 Tesla cube magnet wrapped in black tape with small square of black tape on top (to reduce reflections).
Magnet pole is resting on rear side of Ferrocell and back-lit
with white halogen light. Front of cell shows light following
along the field's lowest potential or null zone. Lighter, wider arc over top of tape is a result of scattering in a perpendicular direction. See a motion demonstration of this effect below.

If you can't play this on your computer,
click here to watch on Youtube

Take a look at this movie and pause at 6 sec. This is a location where a red laser beam scatters around the lowest potential of a cube magnets field ('ring') and where the laser diverges into opposite directions ('rays'). These rays are actually an arc that extends 180 degrees away from the cell surface. This projected arc grows exponentially larger as the distance from cell to screen increases. In this effect, the cell functions as a magnetic lens.

By applying a magnetic field (or electromagnetic) in a predetermined polarization, the light may be rotated or positioned at a movable point.

This is a 400x  image has been altered only by using a green filter in
Photoshop. The nano-particles have assembled into microscopic
dual chains, oriented perpendicular to the applied magnetic field.
This region is where the 'ring' emerges. A laser shining through these
chains scatter into opposite directions forming an x-axis ray.
This condition of the particles moving into a lower energy
state is known as the Rosensweig Instability.

A paper parabola target is placed on the output side of a Ferrocell
induced with two cylinder magnets and stimulated with a red laser.
Top two frames show target with and without magnets.
With magnets, it's obvious the "secondary" arc is diverged a full
180 degrees. (look closely at the lower left and right frames).

Light emerges and diverges into the X-axis arc from the center of
the cell with the same diameter as the primary Z-axis laser beam,
but at a reduced brightness.  A significant amount of the laser beam
is wasted in the primary Z-axis, but can be useful by using a
variety of modulation methods for extended modes of operation.

By inducing a 4-phase (with 90 degree offsets) quadrupole electromagnetic field into the cells center, the arc can be rotated continuously in a 360 degree circle around the laser beam (helical).

Four 90 degree phase deflections will allow you to construct electromagnetically actuated
moving light displays, rotary optical switches, optical gates, helical scanners and more.

A Different type of Technology:

A Ferrocell does not function from single-potential electrostatics that rely
on substrate-based methods which impose limits of freedom. This is not typical TMOKE.

A Ferrocell responds to an induced magnetic field and is capable of scattering light with more
degrees of freedom than either MEMS* or FLCD** technology
can obtain.





* MEMS = Micro-Electrical-Mechanical System
** FLCD = Ferro-Liquid Crystal Display