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Current sensor based on an integrated micro-ring resonator and superparamagnetic nanoparticles.

Mandan Luo, Qing Yang, Yanxiao He

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    |March 4, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an ultra-small photonic current sensor using a silicon micro-ring resonator coated with superparamagnetic nanoparticles. The sensor accurately detects alternating currents by measuring temperature-induced spectral shifts, paving the way for integrated micro-sensors.

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    Area of Science:

    • Photonics
    • Nanotechnology
    • Sensor Technology

    Background:

    • Integrated photonic sensors offer miniaturization potential.
    • Superparamagnetic nanoparticles can be utilized for sensing applications.
    • Micro-ring resonators are sensitive optical components.

    Purpose of the Study:

    • To demonstrate an ultra-small integrated photonic current sensor.
    • To utilize Fe3O4 superparamagnetic nanoparticles (SPNPs) for current sensing.
    • To investigate the sensor's performance in terms of linearity and frequency range.

    Main Methods:

    • Fabrication of a silicon micro-ring resonator (MRR) with a cladding layer of Fe3O4 SPNPs.
    • Utilizing the temperature change of the MRR due to energy loss in SPNPs under an alternating current's magnetic field.
    • Measuring the spectral shift in MRR transmission as an indicator of current.

    Main Results:

    • Demonstrated an ultra-small integrated photonic current sensor.
    • Achieved good linearity in the frequency range of 0-60 kHz.
    • Successfully detected current amplitudes from 0 to 0.5 A.

    Conclusions:

    • The developed sensor provides a basis for integrated micro-current sensors.
    • This work promotes the development of silicon-based photoelectric sensors.
    • The Fe3O4 SPNP-coated MRR sensor shows promise for practical applications.