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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
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Multimode fiber surface plasmon resonance sensor based on a down-up taper.
Optics Letters
|October 14, 2022
Summary
This study presents a novel fiber optic sensor for precise refractive index measurement. The compact device demonstrates high sensitivity and robustness, offering potential for advanced biological and chemical sensing applications.
Area of Science:
- Optoelectronics
- Nanotechnology
- Chemical Sensing
Background:
- Surface Plasmon Resonance (SPR) sensors are crucial for detecting changes in refractive index.
- Traditional SPR sensors often face limitations in sensitivity, size, and robustness.
Purpose of the Study:
- To propose and demonstrate a novel multimode fiber SPR sensor.
- To enhance measurement sensitivity and device robustness for refractive index sensing.
Main Methods:
- Fabrication of a down-up taper structure using multimode fibers.
- Deposition of a Chromium (Cr) + Silver (Ag) layer via magnetron sputtering.
- Characterization of the sensor's performance for refractive index measurement.
Main Results:
- Achieved a high refractive index sensitivity of approximately 3264.01 nm/RIU within the 1.345-1.375 range.
- The sensor exhibits a compact size (approx. 2.75 mm length) and improved robustness due to a larger waist diameter (40 µm).
Conclusions:
- The down-up taper multimode fiber SPR sensor offers enhanced sensitivity and robustness.
- The device shows significant potential for practical applications in biological and chemical sensing.
