Figure 8
From: Strip-loaded Mach–Zehnder interferometer for absolute refractive index sensing
Characterisation results. (a) Photograph of the TE fundamental mode at the output of the Y-branch splitter with S-bend length of 150 \(\upmu \)m. The separation between the two arms is 50 \(\upmu \)m. (b) Photograph of the TE fundamental mode at the output of the strip-loaded Mach–Zehnder interferometer with air as cladding material in the sensing region. (c) Measured output power as a function of the analyte refractive index with sine fitting. (d) Calculated effective index change as a function of refractive index change of the analyte with fitting in microns. The sensing length is 5 mm. The slope represents a homogeneous sensitivity of 0.128.
