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. 2017 Jan 6;17(1):100. doi: 10.3390/s17010100

Figure 3.

Figure 3

(a) Designed silica waveguide resonator; (b) test system used to measure the Q actor and the resonant depth; (c) test results for resonator with a 4.8 μm gap; (d) scanning electron microscope (SEM) image of waveguide cross-section; (e) coupling region viewed under confocal microscope.