研究目的
To propose and experimentally demonstrate a sensor for sensitivity-enhanced refractive index (RI) sensing based on Vernier effect by connecting two microfiber knot resonators (MKRs) in series.
研究成果
The RI sensor based on the series structure of two MKRs with Vernier effect has high sensitivity up to 3301.76 nm/RIU and detection resolution of 6.057×10?6 RIU. The simple structure and easy fabrication of the series structure of two MKRs with Vernier effect offer references for sensitization of wavelength shift measurement in various fields, including physical, chemical and biological signal detection.
研究不足
The resolution of the RI sensor is largely determined by the resolution of the OSA, which is 20pm in the experiment.
1：Experimental Design and Method Selection:
The study involves the theoretical analysis and experimental verification of a series structure of two MKRs for RI sensing based on Vernier effect.
2：Sample Selection and Data Sources:
Two MKRs made from double-ended tapered fibers with microfiber diameters of
3：2μm and connected in series through a standard Single Mode Fiber (SMF) about 1m long. List of Experimental Equipment and Materials:
Broadband light source (BBS), optical spectral analyzer (OSA), aqueous sodium chloride solution, pure water.
4：Experimental Procedures and Operational Workflow:
Change the ambient RI of MKR1 by increasing the concentration of aqueous sodium chloride solution, keep MKR2 in pure water, and trace the wavelength shift caused by the change of RI using OSA.
5：Data Analysis Methods:
Processing the spectrum data to get the spectrum envelope shift of the RI sensor and calculating the sensitivity and resolution of the sensor.
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