Noise Tolerant Photonic Bowtie Grating Environmental Sensor

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.