Magnetically Controlled Reflection of a Ferrofluid Cell



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Figure 12 – Picture of nine shiny magnets using a polarized filter.
In Figure #11 I am showing a new ferrofluid cell with it's perimeter leds being tested. Note the color change of the yellow wire in the double reflection. The first reflected image is from the top surface of the glass and the second reflection is from light that has traveled through the ferrofluid layer. Obviously, the cell does not reflect blue light well.
Figure #12 is a picture of nine shiny Samarium–cobalt magnets in a plastic jig and I am testing a polarized filter on the camera. Not shown but when I rotated the polarized filter the shadows of the magnets stayed at the same intensity but magnets became shiny. Each magnet is 12mm in diameter and 25mm tall. I will use the array of magnets (N,S,N;S,N,S;N,S,N) as the standard applied field in the rest of the document.
Some final observations of Figures #9 and #10 is that because we know light is at 29.23 degrees while in the ferrofluid layer and that the camera takes pictures from above the ferrofluid cell; there are two ways for a light ray to get the camera; one is for the light ray to bend upward -29.23 degrees BEFORE it gets to the ferrofluid/glass interface or to bend downward an additional 15.76 degrees in order to strike the mirror surface and then travel straight up to the camera.

In both these scenarios you would need over 15 degrees divergence of the light ray within a path length of less than 120 microns. I feel confident in saying that classical refraction optics CAN NOT fulfill these requirements!

Birefringence and Faraday rotation do not bend light quickly; light propagates at one foot per nanosecond and thus the light is only spending only a few picoseconds inside the ferrofluid. I ran some numbers and just using classical optics, I would need a local index of refraction of over 4, (n>4), or a local index of refection less than 1.



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