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The effect of nanosecond laser pulses (λ=1064 nm) on the optical properties of
onion-like carbon (OLC) prepared by high-temperature vacuum annealing of detonation
nanodiamond and dispersed in N,N-dimethylformamide (DMF) was studied. It is found that
the interaction between laser pulses and OLC suspension resulted in the suspension bleaching
in the interaction point. The bleached fraction of the suspension was pushed out from
inhomogeneous magnetic field. The observed behavior could be explained by laser-stimulated
chemical reactions between OLC and DMF, which led to the formation of a new substance
with pronounced diamagnetic properties. Relying on the effect discovered, a model of
magnetically controlled optical switch was proposed.
Keywords: diamagnetism; onion-like suspension; optical bleaching; laser radiation |
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