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. 2014 Dec 18;4:7528. doi: 10.1038/srep07528

Figure 5.

Figure 5

(a) Measured TM-polarized transmission spectra of the 8-element CROW device with DI water as the upper-cladding. Green dashed-line: reference wavelength λ0 of 1562.72 nm. Red dashed-lines: probe wavelengths, λp1 (1563.50 nm) and λp2 (1565.56 nm). (b) Measured infrared light-scattering images of the CROW with DI water upper-cladding at eigenstates I-VIII. The white-line box indicates the integration window for the pixelized patterns. (c) Pixelized mode-field intensity patterns at eigenstates I–VIII. (d) Calibrated library of the correlation coefficients ρ1′–ρ8′ as a function of Δn. White dashed-lines indicate the ΔnB values at λp1 and λp2. (e) Calculated differential correlation coefficients as a function of Δn. (f) Calculated sensitivity as a function of probe wavelength. Red dashed-lines indicate a sensitivity of 43 RIU−1 at λp1 and 752 RIU−1 at λp2. (g) Calculated noise-equivalent detection limit as a function of probe wavelength. Red dashed-lines indicate a NEDL of 5.4 × 10−5 RIU at λp1 and 6 × 10−6 RIU at λp2.