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Optical transmission modulation by disk-shaped ferromagnetic particles
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View: Figures


Image of FIG. 1.
FIG. 1.

Lithographically defined photoresist pattern with magnetic disks deposited on top. The inset shows the released disks.

Image of FIG. 2.
FIG. 2.

(Color online) Light intensity transmitted through the solution of magnetic disks driven by 0.2 Hz magnetic field oriented (a) perpendicular and (b) parallel to the optical axis. (c) The intensity modulation obtained by alternating between the two field directions.

Image of FIG. 3.
FIG. 3.

(Color online) Schematic diagram of the magnetic disks before (a) and after the external field is switched on. (b) The field perpendicular to the illumination beam results in a decrease of the total transmitted light. The opposite effect is observed when the incident beam and the magnetic field are parallel (c).

Image of FIG. 4.
FIG. 4.

(Color online) Range of light intensity modulation for a single modulating magnetic field oriented perpendicular (a) and parallel (b) to the illumination beam and two modulating fields (c).

Image of FIG. 5.
FIG. 5.

(Color online) Normalized frequency dependent light modulation amplitude for (a) a single modulating magnetic field and (b) two orthogonal magnetic fields. The addition of the second magnetic field results in significant broadening of the frequency modulation range. The inset graphs demonstrate the shape of the light intensity signal at different modulation frequencies for this configuration of the magnetic fields.

Image of FIG. 6.
FIG. 6.

(Color online) Light intensity modulation as a function of the input signal amplitude at a modulation frequency of 300 Hz. The application of stronger magnetic field yields an increased amplitude of the light intensity modulation. Inset: corresponding spectra of the light modulated by magnetic disks driven by magnetic fields with different amplitudes.


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Scitation: Optical transmission modulation by disk-shaped ferromagnetic particles