Highly sensitive detection of magneto-optical markers based on magneto-optical gate effect

TL;DR

This paper introduces a highly sensitive method for detecting magnetic nanoparticles using a novel magneto-optical gate effect, enabling rapid and precise detection based on changes in light scattering under magnetic fields.

Contribution

The paper proposes a new magneto-optical detection technique utilizing the magneto-optical gate effect for magnetic nanoparticles, enhancing sensitivity and detection speed.

Findings

Detection limit of 0.2 μg/mL for MNPs.

Effective optical path length of 10 μm.

Generation of a 2f AC signal under magnetic excitation.

Abstract

In this paper, a new concept of magnetic nanoparticles as magneto-optical markers is proposed, and a "magneto-optical gate" effect is explored. High-sensitivity detection of magnetic nanoparticles (MNPs) was developed based on this principle. Under irradiation from monochromatic light with a wavelength much larger than the size of a given MNP, Rayleigh scattering occurs on the MNP surface. The MNPs anisotropic and orientate themselves into chains, meaning that the Rayleigh scattering now decreases under magnetic field excitation. After applying an AC magnetic field of frequency f, the transmitted light passing through the MNPs reagent generates an AC signal with a frequency of 2f. Moreover, the 2f signal disappears after removal of the magnetic field. This creates a "magneto-optical gate" effect. The instantaneous and highly sensitive detection of magneto-optical markers with a concentration of 0.2 {\mu}g/mL and an effective optical path length of 10 {\mu}m is realized based on this "magneto-optical gate" effect.