Experimental Study of Two-Time Physics in Self-Assembled Hyperbolic Metamaterials (IMAGE)
Caption
(a) In the absence of external magnetic field, cobalt nanoparticles are randomly distributed within the ferrofluid, and their magnetic moments (which are shown by the red arrows) have no preferred spatial orientation. (b) Application of external magnetic field leads to formation of nanocolumns (made of nanoparticles) which are aligned along the field direction. Propagation of light in such a metamaterial is mathematically described by two time-like variables. (c) Schematic diagram of the experimental geometry. A thermal camera is used to study CO2 laser beam propagation through the ferrofluid subjected to external DC magnetic field. The inset shows the measured beam shape in the absence of the ferrofluid sample. Two orientations of the external magnetic field B used in our experiments are shown by green arrows. The red arrow shows laser light polarization.
Credit
V. Smolyaninova et al., doi 10.1117/1.AP.2.5.056001
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