Abstract
We implement time-resolved Kerr microscopy (TRKM) system with ∼ 1 μ m spatial resolution for observation of coupled electron–nuclear spin dynamics such as dynamic nuclear polarization (DNP) in a local area of the laser spot. From TRKM measurements, Larmor precession of electron spins injected by right ( σ + ) or left ( σ − ) circular polarized pump pulse is detected. The difference of the precession frequencies between σ + and σ − pumping corresponds to the polarization-dependent nuclear magnetic field caused by DNP. This indicates that we successfully detect coupled electron–nuclear spin dynamics in a local area of the laser spot size of ∼ 1.5 × 1.5 μ m 2 . Furthermore, we show the pump and probe power dependences of DNP in high optical intensity region. All-optical NMR is also demonstrated at arbitrary frequencies by controlling acousto-optical modulator.
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