I've recently conducted experiments by inserting a 30µm Ferrofluid thin film, equally dispersed and sealed between two optically flat windows, parallel to a homogeneous electromagnetic field while irradiated with 532 nm laser in the transmission mode and on to a target.
Over a period of 10 seconds, a scattered Airy-type ring slowly resolves on the face of the target.
Positioning the thin-film closer or farther away from the target alters the outer diameter of the resulting Airy-type ring. I have searched for papers written on this topic but have not found anything similar. I think the Airy pattern is a result of nanoparticle absorption and heating by laser.
See the reference image. Also I've recently uploaded a pre-print draft on this topic. See my profile for details.
Any thoughts would be welcome and I look forward to a brisk discussion.
Dear Timm,
gamma Fe3O3 is often find in magnetic colloids. Do you have taken into account that this oxide can be transformed by a laser spot into alpha Fe2O3 which has different optical indices than gamma. In the past, I have written some bits in gamma Fe2O3 films with focused blue lasers spots (see document in research gate or at DOI:10.1143/JJAP.38.1826). Do you think that such a transformation could be possible in your setup?
Best regards.
Philippe Tailhades.
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