Open AccessCurrent sensor based on an integrated micro-ring resonator and superparamagnetic nanoparticles
Author(s) -
Mandan Luo,
Qing Yang,
Yanxiao He,
Renyuan Liu
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.386493
Subject(s) - materials science , optoelectronics , resonator , superparamagnetism , cladding (metalworking) , current sensor , photonics , optics , silicon , photoelectric effect , current (fluid) , nanoparticle , magnetic field , nanotechnology , electrical engineering , magnetization , physics , quantum mechanics , metallurgy , engineering
An ultra-small integrated photonic current sensor based on a silicon micro-ring resonator (MRR) with a cladding layer of Fe 3 O 4 superparamagnetic nanoparticles (SPNPs) is demonstrated. In the magnetic field generated by an alternating current, the Fe 3 O 4 SPNPs lose energy and change the MRR temperature, which leads to a spectral shift in the MRR transmission. The sensor was demonstrated with good linearity in the frequency range 0-60 kHz and current amplitudes from 0 to 0.5 A. This work provides a basis for integrated micro-current sensors, and promotes the development of photoelectric sensors on silicon substrates.