Optical magnetic field microsensors based on GaN diode optopairs integrated with magnetic fluids

In this work, the development of optical magnetic microsensors based on chip-scale GaN-on-sapphire diode optopairs integrated with magnetic fluids is demonstrated. The submillimeter-sized optopairs function as light emitters and detectors and the transparent sapphire substrate as light-guiding media...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 41; no. 15; pp. 1 - 6
Main Authors Chen, Jian, Zhu, Ling, Tang, Xinke, Li, Kwai Hei
Format Journal Article
LanguageEnglish
Published New York IEEE 01.08.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Detectors
Emitters
Gallium nitrides
GaN
magnetic field
Magnetic field measurement
Magnetic fields
magnetic fluid
Magnetic fluids
Magnetic liquids
Magnetic sensors
microsensor
Optical reflection
optoelectronic integration
Photoconductivity
Recesses
Sapphire
Substrates
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Summary:In this work, the development of optical magnetic microsensors based on chip-scale GaN-on-sapphire diode optopairs integrated with magnetic fluids is demonstrated. The submillimeter-sized optopairs function as light emitters and detectors and the transparent sapphire substrate as light-guiding media is covered with magnetic fluids using PDMS recesses. The magnetic fluid strength introduces the optical reflection introduces changes in optical reflection at the boundary between the sapphire and the magnetic fluid, thus varying the amount of light received by the photodetector. Verified through experimental measurements, the micro-sensor exhibits a wide detection range of 50-2000 Gs and a fast response time of 0.06 s. The developed magnetic sensor provides remarkable features of rapid response, wide measurement range, high compactness, and simplicity of operation, making it well-suited for use in practical applications.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2023.3253672