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Reflection spectra of the different ball resonators, reporting return loss in the 1540–1600 nm range for different RI values (1.34798–1.34922). The window in each chart shows the spectral feature interrogated by the system. Ball resonator diameters: (a) 547 μm; (b) 532 μm; (c) 494 μm; (d) 466 μm.
