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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Bragg gratings in rectangular microfiber for temperature independent refractive index sensing.

Yang Ran¹, Long Jin, Li-Peng Sun

¹Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.

|June 30, 2012

Summary

We developed a fiber Bragg grating in rectangular microfiber for temperature-independent refractive index (RI) measurement. By analyzing the wavelength separation of two distinct peaks, accurate RI sensing is achieved, unaffected by temperature fluctuations.

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Area of Science:

Photonics and optical sensing
Materials science
Nanotechnology

Background:

Refractive index (RI) sensors are crucial for various applications.
Temperature fluctuations often interfere with RI measurements, limiting sensor accuracy.
Rectangular microfibers offer unique optical properties due to high geometrical birefringence.

Purpose of the Study:

To demonstrate a novel fiber Bragg grating (FBG) sensor fabricated in rectangular microfiber.
To achieve temperature-independent refractive index (RI) measurement using this FBG.
To investigate the distinct RI responses and identical temperature sensitivities of the dual Bragg peaks.

Main Methods:

Fabrication of a fiber Bragg grating within a rectangular microfiber.
Utilizing the high geometrical birefringence of the microfiber to generate two distinct Bragg peaks.
Analyzing the wavelength shifts of the two peaks in response to changes in RI and temperature.

Main Results:

The FBG exhibited two Bragg peaks with different sensitivities to RI due to varying evanescent field interactions.
Both peaks showed identical temperature sensitivities, primarily influenced by the thermo-optic effect of silica.
A method for temperature-independent RI sensing was successfully demonstrated by monitoring the wavelength separation between the two peaks.

Conclusions:

Fiber Bragg gratings in rectangular microfibers enable dual-peak operation for advanced sensing.
The differential RI response and common temperature sensitivity allow for accurate, temperature-compensated RI measurements.
This technology offers a promising solution for reliable optical sensing in environments with varying temperatures.