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Current sensor based on an integrated micro-ring resonator and superparamagnetic nanoparticles
Optics Express
|March 4, 2020
Summary
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.
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.
