Twin lossy mode resonance on a single D-shaped optical fiber

This Letter presents the fabrication of dual lossy mode resonance (LMR) refractometers based on titanium dioxide ( T mathvariant="normal">i mathvariant="normal">O 2 ) and tin oxide mathvariant="normal">S mathvariant="normal">n thin films deposited a single side-polished D-shaped optical fiber. For first time, to best our knowledge, two independent LMRs are obtained in same fiber, by using step-shaped nanostructure consisting section with thickness 120 nm second 140 (120 20 ). Each is responsible for generating first-order LMR TM-polarized light mathvariant="normal">L mathvariant="normal">M mathvariant="normal">R atomic layer deposition electron-beam deposition. The theoretical results show that depth each resonances depends length corresponding section. Two experimental devices were fabricated sections different lengths, their sensitivities studied, achieving values ∼ 4000 mathvariant="normal">m / mathvariant="normal">r mathvariant="normal">e mathvariant="normal">f mathvariant="normal">a mathvariant="normal">c mathvariant="normal">t mathvariant="normal">v width="thinmathspace" mathvariant="normal">d mathvariant="normal">x mathvariant="normal">u (RIU) maximum 4506 nm/RIU SRI between 1.3327 1.3485.