346047.fig.002a
(a)
346047.fig.002b
(b)
346047.fig.002c
(c)
346047.fig.002d
(d)
Figure 2: The relationship between interference signals of reference signals ( ), with the radius (black line) = 1.550 μm, and sensing signals ( is varying from 1.65 to 1.95 μm, red line), (a) μm, (b) μm, (c) μm, and (d) μm.