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In this paper, the fibers with Yb3+/Ho3+ co-doped air cladding are fabricated by the plasma non-chemical vapor deposition method with the stack-capillary-draw technique for the first time to our knowledge. By the excitation at 975 nm, the fluorescence and up-conversion emission properties of these fibers are experimentally investigated. The mechanism of up-conversion emission is analyzed. The results...
We design a double U-shaped ring-based metamaterial, which has a good capability of the realization of sense of refractive indexes. The metamaterial consists of two regularly spaced parallel arrays of U-shaped rings with 90° rotation embedded in a medium, in the top of which an array of holes are dug for sensing unknown materials. Our simulations demonstrate that the structure can recognize subtle...
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