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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Serial-tilted-tapered fiber with high sensitivity for low refractive index range
Optics Express
|January 18, 2019
Summary
This study introduces a compact optical fiber sensor for detecting low refractive index (RI) changes. The serial-tilted-tapered fiber (STTF) sensor demonstrates high sensitivity, making it suitable for chemical and biological applications.
Area of Science:
- Optoelectronics
- Fiber Optics Sensors
- Nanophotonics
Background:
- Refractive index (RI) sensing is crucial for chemical and biological analysis.
- Existing sensors often face limitations in sensitivity, size, or applicability to low RI environments.
Purpose of the Study:
- To propose and experimentally validate a novel optical fiber sensor for sensitive detection of low refractive indices.
- To investigate the sensing performance and characteristics of a serial-tilted-tapered fiber (STTF) structure.
Main Methods:
- Fabrication of a compact STTF structure, acting as two concatenated micro Mach-Zehnder interferometers (MZIs).
- Numerical simulations to analyze the evanescent field distribution around the STTF.
- Experimental characterization of the sensor's response to varying RI and temperature.
Main Results:
- The STTF sensor exhibits a strong evanescent field, enabling high RI sensitivity.
- Nonlinear wavelength and intensity responses were observed with increasing RI.
- Peak RI sensitivities of 2300 nm/RIU and -16183.33 dB/RIU were achieved in the RI range of 1.3532–1.3538.
- The sensor demonstrated low sensitivity to temperature fluctuations.
Conclusions:
- The proposed STTF optical fiber sensor offers high sensitivity and a compact design for low RI detection.
- Its robustness against temperature variations and high sensitivity make it a promising candidate for chemical and biological sensing applications.
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