Figure 1: Illustration of the measurement setup. | Scientific Reports

Figure 1: Illustration of the measurement setup.

From: Simultaneous imaging of magnetic field and temperature distributions by magneto optical indicator microscopy

Figure 1

A MOI composed of a magneto optical (MO; bismuth substituted yttrium iron garnet) and a mirror (aluminum thin film; thickness:100 nm) layers coated on a glass substrate was placed on a device under test (DUT), and monitored by polarization microscope system with a light emitting diode (LED, λ = 530 nm) light source. The linearly polarized light by a sheet polarizer was modulated to be the left-handed and the right-handed circularly polarization states by a variable liquid crystal retarder. The optical axis of the liquid crystal retarder was aligned by 45° to the polarization direction of the incident light, and the retardation was modulated by changing the applied AC voltage. The modulated light propagated to the magneto optical indicator (MOI) placed on the DUT through a non-polarized beam splitter, and the light intensity reflected from the mirror layer was measured by a CCD camera.

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