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We propose and demonstrate a refractive index (RI) sensor based on a dual-hole elliptical core fiber (DHECF), which is available for microfluidic chips. By using the heating-twisting technology, we fabricate a helical long period grating (HLPG) structure in the DHECF. This sensor is convenient for microfluidic chips because of the dual-hole structure in the fiber, which is the natural microfluidic...
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