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Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

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Noise Tolerant Photonic Bowtie Grating Environmental Sensor.

Kezheng Li¹, Nyasha J Suliali¹, Pankaj K Sahoo^1,2

¹School of Physics, Engineering and Technology, University of York, Heslington, York YO10 5DD, U.K.

|April 10, 2024

Summary

A new bowtie-shaped sensor offers high sensitivity for refractive index sensing. This novel sensor design compensates for temperature changes and vibrations, enabling real-world applications.

Keywords:

bowtie grating guided-mode resonance mechanically robust sensor optical sensor temperature compensation

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Area of Science:

Photonics
Sensor Technology
Biotechnology

Background:

Resonant photonic refractive index sensors offer high sensitivity and contactless readout.
Sensor sensitivity is often compromised by external factors like temperature and vibrations.
Technological implementation of these sensors is hindered by susceptibility to environmental noise.

Purpose of the Study:

To develop a novel bowtie-shaped sensor for highly sensitive refractive index (RI) detection.
To engineer a sensor capable of compensating for temperature variations and mechanical vibrations.
To demonstrate the sensor's applicability in real-world environments.

Main Methods:

Design and fabrication of a novel bowtie-shaped resonant photonic sensor.
Experimental validation of the sensor's response to refractive index variations.
Testing the sensor's stability and accuracy under fluctuating temperatures and mechanical vibrations.

Main Results:

The bowtie sensor demonstrated high responsiveness to RI changes.
The sensor successfully compensated for temperature fluctuations and mechanical vibrations.
Achieved 0.1% salinity detection precision (2.3 × 10^-4 RI units) amidst environmental noise.
Successfully detected bacterial growth in a pilot industrial setting.

Conclusions:

The novel bowtie sensor overcomes limitations of traditional resonant photonic sensors.
This technology enables the translation of high-sensitivity sensors into practical, real-world applications.
The sensor shows promise for environmental monitoring and industrial process control.